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  • 1
    Call number: ZSP-553-11
    In: Meddelelser om Grønland
    Type of Medium: Monograph available for loan
    Pages: 24 S.
    ISBN: 8717051193
    ISSN: 0106-1046
    Series Statement: Meddelelser om Grønland : Geoscience 11
    Language: English
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  • 2
    Call number: ZSP-553-10
    In: Meddelelser om Grønland
    Type of Medium: Monograph available for loan
    Pages: 28 S., 11 Beil.
    ISBN: 8717051118
    ISSN: 0106-1046
    Series Statement: Meddelelser om Grønland : Geoscience 10
    Language: English
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  • 3
    Call number: ZSP-558-14 ; MOP 46209 / Mitte
    In: Middle atmosphere program
    Type of Medium: Series available for loan
    Pages: 368 S. : Ill., graph. Darst.
    Language: English
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  • 4
    Call number: ZSP-553-5
    In: Meddelelser om Grønland
    Type of Medium: Monograph available for loan
    Pages: 19 S.
    ISBN: 8717028736
    ISSN: 0106-1046
    Series Statement: Meddelelser om Grønland : Geoscience 5
    Language: English
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  • 5
    Call number: ZSP-558-1
    In: Middle atmosphere program
    Type of Medium: Series available for loan
    Pages: V, 104 S. : graph. Darst.
    Language: English
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  • 6
    Call number: ZSP-558-2
    In: Middle atmosphere program
    Type of Medium: Series available for loan
    Pages: IX, 505 S. : Ill., graph. Darst.
    Language: English
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  • 7
    Monograph available for loan
    Monograph available for loan
    Associated volumes
    Call number: ZSP-558-5
    In: Middle atmosphere program
    Type of Medium: Monograph available for loan
    Pages: 188 S. : graph. Darst.
    Language: English
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  • 8
    Monograph available for loan
    Monograph available for loan
    Associated volumes
    Call number: ZSP-558-4
    In: Middle atmosphere program
    Type of Medium: Monograph available for loan
    Pages: 200 S. : graph. Darst.
    Language: English
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  • 9
    Call number: AWI P2-88-0760-3
    In: Antarctica and international law, Volume 3
    Type of Medium: Monograph available for loan
    Pages: XI, 551 Seiten
    ISBN: 0379203325
    Language: English
    Note: Arrangement of Volume III: Part VIII Germany. - Part IX Federal Republic of Germany. - Part X Japan. - Part XI New Zealand. - Part XII Norway. - Part XIII Peru. - Part XIV Poland. - Part XV South Africa. - Part XVI Union of Soviet Socialist Republics. - Part XVII United Kingdom of Great Britain and Northern Ireland. - Part XVIII United States of America. - Part XIX Uruguay.
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  • 10
    Call number: ZSP-553-8
    In: Meddelelser om Grønland
    Type of Medium: Series available for loan
    Pages: 392 S. : Ill., graph. Darst., Kt.
    ISBN: 8717029697
    Series Statement: Meddelelser om Grønland : Geoscience 8
    Language: English
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  • 11
    Call number: ZSP-558-7 ; MOP 46209 / Mitte
    In: Middle atmosphere program
    Type of Medium: Series available for loan
    Pages: 152 S.
    Language: English
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  • 12
    Monograph available for loan
    Monograph available for loan
    Copenhagen : Kommissionen for Videnskabelige Undersøgelser i Grønland
    Associated volumes
    Call number: ZSP-553-15
    In: Meddelelser om Grønland
    Type of Medium: Monograph available for loan
    Pages: 72 S. : Ill., zahlr. graph. Darst.
    ISBN: 8717052297
    Series Statement: Meddelelser om Grønland : Bioscience 15
    Language: English
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  • 13
    Monograph available for loan
    Monograph available for loan
    Associated volumes
    Call number: ZSP-558-8
    In: Middle atmosphere program
    Type of Medium: Monograph available for loan
    Pages: 76 S.
    Language: English
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  • 14
    Call number: ZSP-558-9 ; MOP 46209 / Mitte
    In: Middle atmosphere program
    Type of Medium: Series available for loan
    Pages: 579 S. : Ill., graph. Darst.
    Language: English
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  • 15
    Call number: ZSP-558-13 ; MOP 46209 / Mitte
    In: Middle atmosphere program
    Type of Medium: Series available for loan
    Pages: 261 S. : Ill., graph. Darst.
    Language: English
    Location: AWI Reading room
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  • 16
    Monograph available for loan
    Monograph available for loan
    Ottawa : Geological Survey of Canada
    Associated volumes
    Call number: SR 90.0007(317) ; AWI G6-06-0042
    In: Bulletin
    Type of Medium: Monograph available for loan
    Pages: 49 S. + 4 pl.
    ISBN: 066010637X
    Series Statement: Bulletin / Geological Survey of Canada 317
    Language: English
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  • 17
    Monograph available for loan
    Monograph available for loan
    Dordrecht [u.a.] : Kluwer
    Call number: M 99.0101 ; AWI G7-86-0694
    Description / Table of Contents: This book is designed as a comprehensive mathematical introduction to the science of the behaviour of glaciers and ice sheets in their geophysical environment. Its main objective is to provide a better fundamental understanding of the problems of ice mechanics and fluid mechanics of large ice masses, and to connect and unify some of the approaches that have been developed in different disciplines concerned with glaciers and ice sheets. The first two chapters provide the physical background by treating ice within the framework of continuum physics and material science. The central part of the book deals with the conceptualization and mathematical formulation of glacier and ice sheet flow. Considerations concerning fluid mechanics and thermodynamics are given equal attention. The aim is to deduce common glaciological formulae from first principles and to state clearly the assumptions which lie behind the approximations. This allows the extension of the results - known to glaciologists in plane flow only - to three dimensions, thus paving the way for further research.
    Type of Medium: Monograph available for loan
    Pages: xxxvii, 510 S.
    ISBN: 9027714738
    Series Statement: Mathematical approaches to geophysics
    Classification:
    Meteorology and Climatology
    Language: English
    Note: TABLE OF CONTENTS: ACKNOWLEDGEMENTS. - PREFACE. - INTRODUCTION. - SYMBOLS AND NOTATION. - PART I. FUNDAMENTAL PHYSICS AND MATERIALS TECHNOLOGY OF ICE. - 1.General Concepts. - 1. Introduction. - 2. Equations of Balance. - 3. Material Response. - (a) General constitutive relations, simple materials. - (b) The rule of material objectivity. - (c) Material symmetry. - (d) Constitutive response for isotropie bodies. - (e) Materials with bounded memory-some constitutive representations. - (f) Incompressibility. - (g) Some representations of isotropic functions. - 4. The Entropy Principle. - (a) The viscous heat-conducting compressible fluid. - (b) The viscous heat-conducting incompressible fluid. - (c) Pressure and extra stress as independent variables. - (d) Thermoelastic solid. - (e) Final remarks. - 5. Phase Changes. - (a) Phase changes for a viscous compressible heat-conducting fluid. - (b) Phase changes for a viscous incompressible heat-conducting fluid. - References. - 2. A Brief Summary of Constitutive Relations for Ice. - 1. Preliminary Remarks. - 2. The Mechanical Properties of Hexagonal Ice. - (a) The crystal structure of ordinary ice. - (b) The elastic behavior of hexagonal ice. - (c) The inelastic behavior of single-crystal ice. - 3. The Mechanical Properties of Polycrystalline Ice. - (a) The elastic behavior of polycrystalline ice. - (b) Linear viscoelastic properties of polycrystalline ice. - (α) General theory. - (β) Experimental results. - (c) Non-linear viscous deformation and creep. - (α) Results of creep tests. - (β) Generalization to a three-dimensional flow law. - (γ) Other flow laws. - 4. The Mechanical Properties of Sea Ice. - (a) The phase diagram of standard sea ice and its brine conten. - (b) Elastic properties. - (c) Other material properties. - References. - PART II. THE DEFORMATION OF AN ICE MASS UNDER ITS OWN WEIGHT. - 3. A Mathematical Ice-flow Model and its Application to Parallel-sided Ice Slabs. - 1. Motivation and Physical Description. - 2. The Basic Model - Its Field Equations and Boundary Conditions. - (a) The field equations. - (α) Cold ice region. - (β) Temperate ice region. - (b) Boundary conditions. - (α) At the free surface. - (β) Along the ice-water interface. - (γ) Along the bedrock surface. - (δ) Along the melting surface. - 3. The Response of a Parallel-sided Ice Slab to Steady Conditions. - (a) Dimensionless forms of the field equations. - (b) Parallel-sided ice slab, a first approximation to glacier and ice-shelf flow dynamics. - (α) Velocity and temperature fields x-independent. - (β) Extending and compressing flow. - (γ) Floating ice shelves 4. Concluding Remark. - References. - 4. Thermo-mechanical Response of Nearly Parallel-sided Ice Slabs Sliding over their Bed. - 1. Motivation. - 2. The Basic Boundary-value Problem and its Reduction to Linear Form. - 3. The Solution of the Boundary-value Problems. - (a) Zeroth-order problem. - (b) First-order problem. - (α) Harmonic perturbation from uniform flow for a zero accumulation rate. - (β) Analytic solution for a Newtonian fluid. - (γ) Numerical solution for non-linear rheology. - (δ) Effect of a steady accumulation rate. - (ε) A historical note on a previous approach. - (η) The first-order temperature problem. - (c) Numerical results for steady state. - (α) Transfer of bottom protuberances to the surface. - (β) Basal stresses. - (γ) Surface velocities. - (δ) Effect of a steady accumulation rate. - 4. Remarks on Response to a Time-dependent Accumulation Rate. - 5. Surface-wave Stability Analysis. - (a) The eigenvalue problem. - (b) Discussion of results. - 6. Final Remarks. - References. - 5. The Application of the Shallow-ice Approximation. - 1. Background and Previous Work. - 2. Derivation of the Basal Shear-stress Formula by Integrating the Momentum Equations over Ice Thickness. - (a) Derivation. - (b) The use of the basal shear-stress formula in applied glaciology. - 3. Solution of the Ice-flow Problem using the Shallow-ice Approximation. - (a) Governing equations. - (b) Shallow-ice approximation. - (c) Construction of the perturbation solution. - (d) Results. - (e) Temperature field. - 4. Theoretical Steady-state Profiles. - (a) Earlier theories and their limitations. - (b) Surface profiles determined by using the shallow-ice approximation. - 5. An Alternative Scaling - a Proper Analysis of Dynamics of Ice Sheets with Ice Divides. - (a) Finite-bed inclination. - (b) Small-bed inclination. - (c) Illustrations. - References. - 6. The Response of a Glacier or an Ice Sheet to Seasonal and Climatic Changes. - 1. Statement of the Problem. - 2. Development of the Kinematic Wave Theory. - (a) Full non-linear theory. - (b) Perturbation expansion-linear theory. - (c) An estimate for the coefficients C and D. - (d) Boundary and initial conditions. - 3. Theoretical Solutions for a Model Glacier. - (a) Solutions neglecting diffusion. - (b) Theoretical solutions for a diffusive model. - (α) Coefficient functions for the special model. - (β) Solution for a step function. - (γ) General solution for uniform accumulation rate. - (δ) The inverse problem - calculation of climate from variations of the snout. - 4. General Treatment for an Arbitrary Valley Glacier. - (a) Fourier analysis in time. - (α) Low-frequency response. - (β) High-frequency response. - (γ) Use of the results. - (b) Direct integration methods. - 5. Derivation of the Surface-wave Equation from First Principles Non-linear Theory. - (a) Surface waves in the shallow-ice approximation. - (α) Integration by the methods of characteristics. - (β) An illustrative example. - (γ) A remark on linearization. - (δ) Effects of diffusion. - (b) Remarks regarding time-dependent surface profiles in ice sheets. - (c) Long waves in an infinite ice slab - Is accounting for diffusion enough?. - (α) Basic equations. - (β) Construction of perturbation solutions. - (γ) Numerical results. - 6. Concluding Remarks. - References. - 7. Three-dimensional and Local Flow Effects in Glaciers and Ice Sheets. - 1. Introduction. - 2. Effect of Valley Sides on the Motion of a Glacier. - (a) Solutions in special cases. - (α) Exact solutions for the limiting cases. - (β) Solution for a slightly off-circular channel. - (γ) A note on very deep and wide channels. - (b) A useful result for symmetrical channels with no boundary slip. - (c) Numerical solution - discussion of results. - 3. Three-dimensional Flow Effects in Ice Sheets. - (a) Basic equations. - (b) Decoupling of the stress-velocity problem from the problem of surface profile. - (c) The equation describing the surface geometry. - (d) The margin conditions. - 4. Variational Principles. - (a) Fundamental variational theorem. - (b) Variational principle for velocities. - (c) Reciprocal variational theorem. - (d) Maximum and minimum principles. - (e) Adoption of the variational principles to ice problems. - 5. Discussion of Some Finite-element Solutions. - References. - Appendix: Detailed Calculations Pertaining to Higher-order Stresses in the Shallow-ice Approximation. - AUTHOR INDEX. - SUBJECT INDEX.
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  • 18
    Monograph available for loan
    Monograph available for loan
    New Delhi : Amerind Publishing
    Call number: AWI G2-18-91897
    Description / Table of Contents: This publication is concerned with problems of the origin, evolution and paleogeography of the Arctic Ocean and its coast during the Tertiary and Quaternary periods. Much emphasis is placed on the evolution of modern Arctic flora and fauna, both terrestrial and aquatic. All these problems are discussed on the basis of hydrological, paleontological, biogeographical, climatological and archaeological data presented at the AII-Union symposium held in Leningrad during April 1-6, 1968. This is a unique encyclopedia on the Arctic. lt will be of interest to many research workers - geographers, geologists, biologists, hydrologists and all who deal with problems of the geological history and paleogeography of the Northern Hemisphere.
    Type of Medium: Monograph available for loan
    Pages: XIV, 564 Seiten , Illustrationen
    Uniform Title: Severnyi Ledovityi Okean i Ego Poberezh'e v Kainozoe
    Language: English
    Note: Contents: PREFACE. - SECTION I. HISTORY OF THE ARCTIC OCEAN IN THE CENOZOIC ERA. - Linear and Areal Morphostructures of the Arctic Ocean Floor / V. D. Dibner. - Fluctuations in Arctic Climate as Revealed by Floor Sediment Analysis / N. A. Belov, N. N. Lapina. - Stratification and Rate of Accumulation of Floor Sediments of the Soviet Arctic Seas / N. N. Kulikov, N. N. Lapina, Yu. P. Semenov, N. A. Belov, M. A. Spiridonov. - Palynologic Study of Kara Sea Floor Sediment Cores / N. N. Kulikov, R. M. Khitrova. - Geologic Structure of the Glacial Shelves of the Atlantic Province of the Arctic Basin / M. A. Spiridonov. - Stratigraphy and Paleogeography of Spitsbergen in the Pleistocene / Yu. A. Lavrushin. - Role of Glaciers in Franz Josef Land Relief Formation / V. L. Sukhodrovskii. - Reconstruction of the Late- and Post-Pleistocene Arctic Basin Ice Sheet / P. M. Borisov. - Changes in the Arctic Basin since the Last Glaciation Maximum / D. P. Chizhov. - SECTION II. ARCTIC FLORA AND FAUNA AND THE HISTORY OF THEIR FORMATION. - Some Problems of Study of the Early Cenophytic Arctic Flora / L. Yu. Budantsev. - Arctic Flora and Its Historical Link with the Arctic Ocean / A. I. Tolmachev, B. A. Yurtsev. - Wide Fluctuations in Ocean Level in the Quaternary period and Their Influence on the Arctic Ocean Basin and its biological community / G. U. Lindberg. - Fresh Data on the Food of the Siberian Woolly Rhinoceros / V. E. Garutt, E. P. Meteltseva, B. A. Tikhomirov. - Characteristics of the Arctic Ocean Fauna and their significance for understanding the History of its formation / E. F. Guryanova. - Formation of macroscopic marine algal flora of the Arctic Basin / A. D. Zinova, Yu. E. Petrov. - The Concept of the Arctic origin of Pinnipeds and other solutions of this problem / K. K. Chapskii. - Ecological Adaptations of Pinnipeds in the Atlantic Province of the Polar Basin / V. A. Potelov, Yu. K. Timoshenko. - A General Review of th PIeistocene Marine Faunas of the Northern Coast of Eurasia / S. L. Troitskii. - History of the Evolution of Marine Mollusk Fauna of the Late Cenozoic Atlantic Arctic / V. S. Zarkhidze. - Late Cenozoic History of Foraminifera of the Pechora Lowland and Northern West Siberia / O. F. Baranovskaya, V. Ya. Slobodin. - Species composition of Modern Foraminifera as an Indication of the Arctic Sea's hydrological regime / S. V. Tamanova. - SECTION Ill. PALEOGEOGRAPHY OF THE NORTHERN TERRITORIES IN THE LATE CENOZOIC ERA. - Paleogeography of Northern USSR and contiguous areas of the Arctic Basin / G. S. Ganeshin. - North Eurasia in the Late Cenozoic Era / Yu. P. Degtyarenko, V. V. Zhukov, N. G. Zagorskaya, O. A. Ivanov, V. I. Kaiyalainen, Yu. N. Kulakov, A. P. Puminov, V. Ya. Slobodin, O. V. Suzdalskii. - On the History of the Migration of the Arctic Basin Shoreline in the Cenozoic Era / S. A. Strelkov. - Causes of Fluctuations in the Arctic Basin Level in the Neogene-Quaternary Period / J. L. Kuzin. - Spore-Pollen Analysis of Late Cenozoic Marine Sediments in the Reconstruction of the Paleogeography of the Arctic Coasts / N. G. Zagorskaya, F. M. Levina. - Forest Line Migration in North Asia in the Upper Pleistocene and Holocene (Based on Spore-Pollen Analysis) / R. E. Giterman, L. V. Golubeva, E. V. Koreneva, L. A. Skiba. - Holocene Transgressions and Variations in the Northern Coastline of the Kola Peninsula / B. I. Koshechkin, A. L. Kudlaeva. - Interpretation of Radiocarbon Datings of the Absolute Age of Organic Residues from the Upper Anthropogene Deposits of Fennoscandia / V. G. Chuvardinskii. - Structure and Stratigraphic Division of White Sea Bottom Deposits / V. S. Medvedev, E. N. Nevesskii, L. I. Govberg, E. S. Malyasova, R. N. Dzhinoridze, E. A. Kirienko. - Principal Stages in the History of the Vegetation of the Dvina Bay Coast of the White Sea during the Late- and Postglacial Transgression / E. S. Pleshivtseva. - Quaternary Transgressions in the Northern Russian Plain and Their Relationship with Continental Glaciations / E. N. Bylinskii. - Anthropogene Deposit-Forming Environments on Kolguev Island / O. F. Baranovskaya, T. A. Matveeva. - Cenozoic History of the Northern Coast of Europe / V. S. Zarkhidze. - Stages of Formation of the Southern Part of the Arctic Basin in Timan-Pechora Province in the Late Cenozoic Era / O. F. Baranovskaya, P. N. Safronov, G. N. Berdovskaya. - Pliocene-Pleistocene History of the Pechora Basin / V. L. Yakhimovich. - Paleogeography and Origin of Cenozoic Rocks in Soviet Europe as Revealed by Hydrochemical Data / V. D. Bezrodnov. - Study of Paleogeography and Neotectonics of Some Regions of the European Northeast by Coal Petrography / Yu. V. Stepanov. - History of the Formation of Arctic Shelf Foraminifer Fauna (Based on Data on the Timan-Ural Region) / I. N. Semenov. - Evolution of Pleistocene Marine Diatom Flora in the Northeast of Soviet Europe / E. I. Loseva. - Quaternary Deposits of the Middle Pechora and Vychegda River Basins / A. S. Lavrov. - Late Pleistocene Terraces in the Northeast of Soviet Europe and the Environments in which They were Formed / L. M. Potapenko, A. S. Lavrov. - Key Sections of the Lower Pechora and Their Importance for an Understanding of the Last Stages of the Geological Evolution of Northeastern Soviet Europe / V. S. Zarkhidze, I. I. Krasnov, M. A. Spiridonov, Yu. A. Lavrushin, I. I. Ryumina. - Siberian Elements in the Flora of the Far Northeast of Europe and Their Origin / O. V. Rebristaya. - Some Geographical Relationships of Ural Floras and Their Importance for Paleogeography / K. N. lgoshina. - Ostracod Complexes from the Late Cenozoic Marine Deposits of Northern Soviet Europe and West Siberia and Their Importance for Paleogeography / O. M. Lev. - Paleogeography of the Northern West Siberian Lowland and Russian Plain in the Late Pleistocene and Holocene / M. G. Kipiani, A. D. Kolbutov. - Mammals and Landscapes of the Northern Urals in the Late Anthropogene / I. E. Kuzmina. - Pleistocene Transgressions in Northern West Siberia and the Pechora Lowland / I. D. Danilov. - Salient Paleogeographic Features of the Pechora Lowland and Lower Ob Basin in the Neogene Epoch / P. P. Generalov, I. L. Kuzin, I. L. Zaionts, R. B. Krapivner. - Some Problems of the Quaternary Geology of Northern Soviet Europe and West Siberia / A. G. Kostyaev. - Northern West Siberia in the Pliocene and Pleistocene / O. V. Suzdalskii. - Boreal Transgressions and the Origin of Subsurface Sheet Ice Deposits / B. I. Vtyurin. - Dependence of Certain Types of Subsurface Glaciation in West Siberia on the Peculiarities of the Polar Sea / A .I. Popov. - History of Subsurface Freezing in West Siberia in the Light of Transgression of the Arctic Basin / V. V. Baulin. - New Data on the History of the Evolution of the Pre-Kazantseva and Kazantseva Vegetation in the Muzhi Urals and Southern Yamal (Based on Palynological Data) / E. E. Gurtovaya. - New Data on the Distribution of Recent Marine Deposits in West Siberia / I. L. Zaionts, Z. I. Kholodova. - Pleistocene Diatom Floras of the Yenisei North / Z. V. Aleshinskaya. - Some Upper Cenozoic Stratotypes of the Ust-Yenisei Depression / V. Ya. Slobodin. - Transgressions of the Arctic Basin and Evolution of the Yenisei North in the Pleistocene (Absolute Chronology of Events by 14C Dating) / N. V. Kind, L. D. Sulerzhitskii. - Kargin Diatoms from the Key Section of the Lower Yenisei / N. A. Khalfina. - Spread of Late Cenozoic Transgressions of the Arctic Basin in the Northwestern Central Siberian Tableland / V. D. Kryukov, V. V. Rogozhin. - Paleogeography of Northeastern Taimyr in the Quaternary Period (Based on Geological and Palynological Data) / G. N. Berdovskaya, N. A. Gei, V. M. Makeev. - Emergence and Development of Pleistocene Landscapes in the Eastern North Siberian Lowland / V. V. Zhukov, N. A. Pervuninskaya, L. Ya. Pinchuk. - History of Relief Formation in the Eastern North Siberian Lowland and the Adjoi
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  • 19
    Monograph available for loan
    Monograph available for loan
    Amsterdam [u.a.] : Elsevier Scientific Publ.
    Associated volumes
    Call number: AWI Bio-99-0079-2
    In: The Northwest European Pollen Flora, II
    Type of Medium: Monograph available for loan
    Pages: V, 265 S. , zahlr. Ill.
    ISBN: 0444418806
    Language: English
    Note: CONTENTS: Preface / G. C. S. Clarke and W. Punt. - 8. Solanaceae / W. Punt and M. Monna-Brands. - 9. Saxifragaceae / A. A. M. L. Verbeek-Reuvers. - 10. Boraginaceae / G. C. S. Clarke. - 11. Escalloniaceae / A. A. M. L. Verbeek-Reuvers. - 12. Grossulariaceae / A.A.M.L. Verbeek-Reuvers. - 13. Hydrangeaceae / A. A. M. L. Verbeek-Reuvers. - 14. Parnassiaceae / A. A. M. L. Verbeek-Reuvers. - 15. Plantaginaceae / G. C. S. Clarke and M. R.Jones. - 16. Valerianaceae / G. C. S. Clarke and M. R. Jones. - 17. Aceraceae / G. C. S. Clarke and M. R. Jones. - 18. Hippuridaceae / M. S. Engel. - 19. Haloragaceae / M. S. Engel. - 20. Papaveraceae / A. J. Kalis. - Index. - Errata.
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  • 20
    Call number: 21/M 20.94120 ; AWI S6-24-91420
    Type of Medium: Monograph available for loan
    Pages: 288 Seiten , Illustrationen, Karten
    Language: English
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  • 21
    Monograph available for loan
    Monograph available for loan
    Cham : Springer Nature
    Call number: AWI G3-21-94155
    Description / Table of Contents: This book provides a comprehensive, up-to-date assessment of the key terrestrial components of the Arctic system, i.e., its hydrology, permafrost, and ecology, drawing on the latest research results from across the circumpolar regions. The Arctic is an integrated system, the elements of which are closely linked by the atmosphere, ocean, and land. Using an integrated system approach, the book’s 30 chapters, written by a diverse team of leading scholars, carefully examine Arctic climate variability/change, large river hydrology, lakes and wetlands, snow cover and ice processes, permafrost characteristics, vegetation/landscape changes, and the future trajectory of Arctic system evolution. The discussions cover the fundamental features of and processes in the Arctic system, with a special focus on critical knowledge gaps, i.e., the interactions and feedbacks between water, permafrost, and ecosystem, such as snow pack and permafrost changes and their impacts on basin hydrology and ecology, river flow, geochemistry, and energy fluxes to the Arctic Ocean, and the structure and function of the Arctic ecosystem in response to past/future changes in climate, hydrology, and permafrost conditions. Given its scope, the book offers a valuable resource for researchers, graduate students, environmentalists, managers, and administrators who are concerned with the northern environment and resources.
    Type of Medium: Monograph available for loan
    Pages: XV, 914, C1 Seiten , Illustrationen, Fotogafien (farbig), Karten (farbig), Diagramme (farbig)
    Edition: corrected publication 2021
    ISBN: 9783030509309
    Language: English
    Note: Contents Part I Arctic Climate and Greenland 1 Arctic Climate Change, Variability, and Extremes / John E. Walsh 2 Precipitation Characteristics and Changes / Hengchun Ye, Daqing Yang, Ali Behrangi, Svetlana L. Stuefer, Xicai Pan, Eva Mekis, Yonas Dibike, and John E. Walsh 3 Snow Cover - Observations, Processes, Changes, and Impacts on Northern Hydrology / Ross Brown, Philip Marsh, Stephen Déry, and Daqing Yang 4 Evaporation Processes and Changes Over the Northern Regions / Yinsheng Zhang, Ning Ma, Hotaek Park, John E. Walsh, and Ke Zhang 5 Greenland Ice Sheet and Arctic Mountain Glaciers / Sebastian H. Mernild, Glen E. Liston, and Daqing Yang Part II Hydrology and Biogeochemistry 6 Regional and Basin Streamflow Regimes and Changes: Climate Impact and Human Effect / Michael Rawlins, Daqing Yang, and Shaoqing Ge 7 Hydrologic Extremes in Arctic Rivers and Regions: Historical Variability and Future Perspectives / Rajesh R. Shrestha, Katrina E. Bennett, Daniel L. Peters, and Daqing Yang 8 Overview of Environmental Flows in Permafrost Regions / Daniel L, Peters, Donald J. Baird, Joseph Culp, Jennifer Lento, Wendy A. Monk, and Rajesh R. Shrestha 9 Yukon River Discharge Response to Seasonal Snow Cover Change / Daqing Yang, Yuanyuan Zhao, Richard Armstrong, Mary J. Brodzik, and David Robinson 10 Arctic River Water Temperatures and Thermal Regimes / Daqing Yang, Hoteak Park, Amber Peterson, and Baozhong Liu 11 Changing Biogeochemical Cycles of Organic Carbon, Nitrogen, Phosphorus, and Trace Elements in Arctic Rivers / Jonathan O'Donnell, Thomas Douglas, Amanda Barker, and Laodong Guo 12 Arctic Wetlands and Lakes-Dynamics and Linkages / Kathy L. Young, Laura Brown, and Yonas Dibike 13 River Ice Processes and Changes Across the Northern Regions / Daqing Yang, Hotaek Park, Terry Prowse, Alexander Shiklomanov, and Ellie McLeod Part III Permafrost and Frozen Ground 14 Permafrost Features and Talik Geometry in Hydrologic System / Kenji Yoshikawa and Douglas L. Kane 15 Ground Temperature and Active Layer Regimes and Changes / Lin Zhao, Cangwei Xie, Daqing Yang, and Tingjun Zhang 16 Permafrost Hydrology: Linkages and Feedbacks / Tetsuya Hiyama, Daqing Yang, and Douglas L. Kane 17 Permafrost Hydrogeology / Barret L. Kurylyk and Michelle A. Walvoord Part IV Ecosystem Change and Impact 18 Greenhouse Gases and Energy Fluxes at Permafrost Zone / Masahito Ueyama, Hiroki Iwata, Hideki Kobayashi, Eugénie Euskirchen, Lutz Merbold, Takeshi Ohta, Takashi Machimura, Donatella Zona, Walter C. Oechel, and Edward A. G. Schuur 19 Spring Phenology of the Boreal Ecosystems / Nicolas Delbart 20 Diagnosing Environmental Controls on Vegetation Greening and Browning Trends Over Alaska and Northwest Canada Using Complementary Satellite Observations / Youngwook Kim, John S. Kimball, Nicholas Parazoo, and Peter Kirchner 21 Boreal Forest and Forest Fires / Yongwon Kim, Hideki Kobayashi, Shin Nagai, Masahito Ueyama, Bang-Yong Lee, and Rikie Suzuki 22 Northern Ecohydrology of Interior Alaska Subarctic / Jessica M. Young-Robertson, W. Robert Bolton, and Ryan Toohey 23 Yukon River Discharge-NDVI Relationship / Weixin Xu and Daqing Yang Part V Cross-System Linkage and Integration 24 River Freshwater Flux to the Arctic Ocean / Alexander Shiklomanov, Stephen Déry, Mikhail Tretiakov, Daqing Yang, Dmitry Magritsky, Alex Georgiadi, and Wenqing Tang 25 River Heat Flux into the Arctic Ocean / Daqing Yang, Shaoqing Ge, Hotaek Park, and Richard L. Lammers 26 Cold Region Hydrologic Models and Applications / Hotaek Park, Yonas Dibike, Fengge Su, and John Xiaogang Shi 27 Regional Climate Modeling in the Northern Regions / Zhenhua Li, Yanping Li, Daqing Yang, and Rajesh R. Shrestha 28 High-Resolution Weather Research Forecasting (WRF) Modeling and Projection Over Western Canada, Including Mackenzie Watershed / Yanping Li and Zhenhua Li 29 Responses of Boreal Forest Ecosystems and Permafrost to Climate Change and Disturbances: A Modeling Perspective / Shuhua Yi and Fengming Yuan 30 Future Trajectory of Arctic System Evolution / Kazuyuki Saito, John E. Walsh, Arvid Bring, Ross Brown, Alexander Shiklomanov, and Daqing Yang Correction to: Arctic Hydrology, Permafrost and Ecosystems / Daqing Yang, and Douglas L. Kane
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    Monograph available for loan
    Monograph available for loan
    New York : Macmillan Learning
    Call number: AWI G1-21-94626
    Type of Medium: Monograph available for loan
    Pages: Getrennte Zählungen , Illustrationen, Karten
    Edition: Eighth edition
    ISBN: 9781319055325 , 9781319325398 , 1319325394
    Former Title: Understanding earth [5th edition]
    Language: English
    Note: Contents About the Authors Preface Chapter 1 The Earth System The Scientific Method Hypothesis and Theory Scientific Models Importance of Scientific Collaboration Geology as a Science Earth's Shape and Surface Peeling the Onion: Discovery of a Layered Earth Earth's Density The Mantle and Core The Crust The Inner Core Chemical Composition of Earth's Major Layers Earth as a System of Interacting Components The Climate System The Plate Tectonic System The Geodynamo Interactions Among Geosystems Support Life An Overview of Geologic Time The Origin of Earth and Its Global Geosystems The Evolution of Life Chapter 2 Plate Tectonics: The Unifying Theory The Discovery of Plate Tectonics Continental Drift Seafloor Spreading The Great Synthesis: 1963-1968 The Plates and Their Boundaries Divergent Boundaries Convergent Boundaries Transform Faults Combinations of Plate Boundaries Rates and History of Plate Movements The Seafloor as a Magnetic Tape Recorder Deep-Sea Drilling Measurements of Plate Movements by Geodesy The Grand Reconstruction Seafloor isochrons Reconstructing the History of Plate Movements The Breakup of Pangaea The Assembly of Pangaea by Continental Drift Implications of the Grand Reconstruction Mantle Convection:The Engine of Plate Tectonics Where Do the Plate-Driving Forces Originate? How Deep Does Plate Recycling Occur? What Is the Nature of Rising Convection Currents? Chapter 3 Earth Materials: Minerals and Rocks What Are Minerals? The Structure of Matter The Structure of Atoms Atomic Number and Atomic Mass Chemical Reactions Chemical Bonds The Formation of Minerals The Atomic Structure of Minerals The Crystallization of Minerals How Do Minerals Form? Classes of Rock-Forming Minerals Silicates Carbonates Oxides Sulfides Sulfates Physical Properties of Minerals Hardness Cleavage Fracture Luster Color Density Crystal Habit What Are Rocks? Properties of Rocks Igneous Rocks Sedimentary Rocks Metamorphic Rocks The Rock Cycle: Interactions Between the Plate Tectonic and Climate Systems Concentrations of Valuable Mineral Resources Hydrothermal Deposits Igneous Deposits Sedimentary Deposits Mineral Evolution Chapter 4 Igneous Rocks: Solids from Melts How Do Igneous Rocks Differ from One Another? Texture Chemical and Mineral Composition How Do Magmas Form? How Do Rocks Melt? The Formation of Magma Chambers Where Do Magmas Form? Magmatic Differentiation Fractional Crystallization: Laboratory and Field Observations Granite from Basalt: Complexities of Magmatic Differentiation Forms of Igneous Intrusions Plutons Sills and Dikes Veins Igneous Processes and Plate Tectonics Spreading Centers as Magma Factories Subduction Zones as Magma Factories Mantle Plumes as Magma Factories Chapter 5 Volcanoes Volcanoes as Geosystems Lavas and Other Volcanic Deposits Types of Lava Textures of Volcanic Rocks Pyroclastic Deposits Eruptive Styles and Landforms Central Eruptions Fissure Eruptions Interactions of Volcanoes with Other Geosystems Volcanism and the Hydrosphere Volcanism and the Atmosphere The Global Pattern of Volcanism Volcanism at Spreading Centers Volcanism in Subduction Zones Intraplate Volcanism: The Mantle Plume Hypothesis 2018 Eruption of Kilauea Volcano, Hawaii Volcanism and Human Affairs Volcanic Hazards Reducing the Risks of Volcanic Hazards Natural Resources from Volcanoes Chapter 6 Sedimentation: Rocks Formed by Surface Processes Surface Processes of the Rock Cycle Weathering and Erosion: The Source of Sediments Transportation and Deposition: The Downhill Journey to Sedimentary Basins Oceans as Chemical Mixing Vats Sedimentary Basins:The Sinks for Sediments Rift Basins and Thermal Subsidence Basins Flexural Basins Sedimentary Environments Continental Sedimentary Environments Shoreline Sedimentary Environments Marine Sedimentary Environments Siliciclastic versus Chemical and Biological Sedimentary Environments Sedimentary Structures Cross-Bedding Graded Bedding Ripples Bioturbation Structures Bedding Sequences Burial and Diagenesis: From Sediment to Rock Burial Diagenesis Classification of SiliciclasticSediments and Sedimentary Rocks Coarse-Grained Siliciclastics: Gravel and Conglomerate Medium-Grained Siliciclastics: Sand and Sandstone Fine-Grained Siliciclastics Classification of Chemical and Biological Sediments and Sedimentary Rocks Carbonate Sediments and Rocks Evaporite Sediments and Rocks: Products of Evaporation Other Biological and Chemical Sediments Chapter 7 Metamorphism: Alteration of Rocks by Temperature and Pressure Causes of Metamorphism The Role of Temperature The Role of Pressure The Role of Fluids Types of Metamorphism Regional Metamorphism Contact Metamorphism Seafloor Metamorphism Other Types of Metamorphism MetamorphicTextures Foliation and Cleavage Foliated Rocks Granoblastic Rocks Porphyroblasts Regional Metamorphism and Metamorphic Grade Mineral Isograds: Mapping Zones of Change Metamorphic Grade and Parent Rock Composition Metamorphic Fades PlateTectonics and Metamorphism Metamorphic Pressure-Temperature Paths Ocean-Continent Convergence Continent-Continent Collision Exhumation: A Link Between the Plate Tectonic and Climate Systems Chapter 8 Deformation: Modification of Rocks by Folding and Fracturing PlateTectonic Forces Mapping Geologic Structure Measuring Strike and Dip Geologic Maps Geologic Cross Sections How Rocks Deform Brittle and Ductile Behavior of Rocks in the Laboratory Brittle and Ductile Behavior of Rocks in Earth's Crust Basic Deformation Structures Faults Folds Circular Structures Joints Deformation Textures Styles of Continental Deformation Tensional Tectonics Compressive Tectonics Shearing Tectonics Unraveling Geologic History Chapter 9 Clocks in Rocks: liming the Geologic Record Reconstructing Geologic History From the Stratigraphic Record Principles of Stratigraphy Fossils as Recorders of Geologic Time Unconformities: Gaps in the Geologic Record Cross-Cutting Relationships The Geologic Time Scale: Relative Ages Intervals of Geologic Time Interval Boundaries Mark Mass Extinctions Ages of Petroleum Source Rocks Measuring Absolute Time with Isotopic Clocks Discovery of Radioactivity Radioactive Isotopes: The Clocks in Rocks Isotopic Dating Methods The Geologic Time Scale: Absolute Ages Eons: The Longest Intervals of Geologic Time Perspectives on Geologic Time Recent Advances in Timing the Earth System Sequence Stratigraphy ,Chemical Stratigraphy Paleomagnetic Stratigraphy Clocking the Climate System Chapter 10 Earthquakes What Is an Earthquake? The Elastic Rebound Theory Fault Rupture During Earthquakes Foreshocks and Aftershocks How Do We Study Earthquakes? Seismographs Seismic Waves Locating the Focus Measuring the Size of an Earthquake Determining Fault Mechanisms GPS Measurements and "Silent" Earthquakes Earthquakes and Patterns of Faulting The Big Picture: Earthquakes and Plate Tectonics Regional Fault Systems Earthquake Hazards and Risks How Earthquakes Cause Damage Reducing Earthquake Risk Can Earthquakes Be Predicted? Long-Term Forecasting Short-Term Prediction Medium-Term Forecasting Chapter 11 Exploring Earth's Interior Exploring Earth's Interior with Seismic Waves Basic Types of Waves Paths of Seismic Waves Through Earth Seismic Exploration of Near-Surface Layering Layering and Composition of Earth's Interior The Crust The Mantle The Core-Mantle Boundary The Core Earth's Internal Temperature Heat Flow Through Earth's Interior Temperatures Inside Earth Visualizing Earth'sThree-Dimensional Structure Seismic Tomography Earth's Gravitational Field Earth's Magnetic Field and the Geodynamo The Dipole Field Complexity of the Magnetic Field Paleomagnetism The Magnetic Field and the Biosphere Chapter 12 The Climate System What Is Climate? Components of the Climate
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    Call number: AWI Bio-22-94766
    Description / Table of Contents: The arctic-boreal treeline is a transition zone from taiga to tundra covering a vast area in Siberia. It often features large environmental gradients and reacts sensitively to changes in the environment. For example, the expansion of shrubs and a northward movement of the treeline are observable in Siberia as a response to the warming climate. The changes in vegetation across the treeline are known to influence the water chemistry in the lakes. This causes further alteration to the composition and diversity of sensitive aquatic organisms such as diatoms and macrophytes. Despite the rising awareness of the complex climate-feedback mechanisms of terrestrial plants, the understanding of their assembly rules and about responses of aquatic biomes in the surrounding treeline lakes is still limited. The goal of this thesis is to examine the previous and present biodiversity of terrestrial and freshwater biomes from the Siberian treeline ecotone, as well as their reactions to environmental changes. In particular, this thesis attempts to ...
    Type of Medium: Dissertations
    Pages: 132 Blätter , Illustrationen, Diagramme, Karten
    Language: English
    Note: Dissertation, Universität Potsdam, 2021 , Contents List of abbreviations Acknowledgements Summary Zusammenfassung 1 Scientific background 1.1 Motivation 1.2 The arctic-boreal ecotone in time and space 1.2.1 Terrestrial plants composition and biodiversity 1.2.2. Lake macrophytes and diatoms 1.3 Sedimentary DNA metabarcoding as an ecologicalproxy 1.4 Study area 1.5 Objectives of the thesis 1.6 Methods 1.7 Thesis organizations 1.7.1 Manuscripts and chapters 1.7.2 Non-finalized research 1.7.2 Author contributions 2 Manuscript I: Genetic and morphological diatom composition in surface sediments from glacial and thermokarst lakes in the Siberian Arctic 2.1 Abstract 2.2 Introduction 2.3 Materials and methods 2.3.1 Sampling and collection of environmental data 2.3.2 Diatom genetic assessment 2.3.3 Raw sequence processing and taxonomic assignment 2.3.4 Morphological diatom identification 2.3.5 Statistical analyses 2.4 Results 2.4.1 Genetic-based diatom composition, diversityand diatom-environment relationship 2.4.2 Morphological-based diatom composition, diversity and diatom-environment relationship 2.4.3 Comparison of spatial diatom patterns obtained from the genetic and morphological approaches 2.5 Discussion 2.5.1 Genetic and morphological diatom composition and diversity 2.5.2 Diatom composition is affected by lake type and lake water parameters 2.6 Conclusions 2.7 Acknowledgments 3 Manuscript II: Plant sedimentary ancient DNA from Far East Russia covering the last 28 ka reveals different assembly rules in cold and warm climates 3.1 Abstract 3.2 Introduction 3.3 Methods 3.3.1 Study area 3.3.2 Sampling and dating 3.3.3 Genetic laboratory works 3.3.4 Processing the sequence data 3.3.5 Statistical analyses 3.4 Results 3.4.1 Overview of the sequencing data and taxonomic composition 3.4.2 Taxonomic alpha and beta diversity 3.4.3 Phylogenetic alpha and beta diversity 3.4.4 Relationship between taxonomic composition and phylogenetic diversity 3.5 Discussion 3.5.1 Vegetation history revealed by sedaDNA 3.5.2 Patterns oftaxonomic alpha diversity and their relationship to community composition 3.5.3 Relationship between richness and phylogenetic alpha and beta diversity 4 Manuscript III: Sedimentary DNA identifies modem and past macrophyte diversity and its environmental drivers in high latitude and altitude lakes in Siberia and China 4.1 Abstract 4.2 Introduction 4.3 Materialsand Methods 4.3.1 Field sampling of surface and core samples 4.3.2 Environmental data 4.3.3 Molecular genetic laboratory work 4.3.4 Bioinformatic analyses 4.3.5 Statistical analyses 4.4 Results 4.4.1 Macrophyte diversity in surface sediments inferred from sedDNA 4.4.2 Relationship of modem macrophyte richness and environmental variables 4.4.3 The relationship between modem macrophyte community and environmental variables 4.4.4 Past macrophyte richness and composition inferred from sedaDNA 4.4.5 Past macrophyte compositional changes and its environmental drivers 4.5 Discussion 4.5.1 Retrieval of aquatic plant diversity using the tmL P6 loop plant DNA metabarcode 4.5.2 Modem macrophyte diversity and its relation to environmental factors 4.5.3 Temporal macrophyte diversity as an indicator for past environmental change 4.6 Conclusion 5 Synopsis 5.1 Potential and limitations of sedimentary DNA in the applied study 5.1.1 Sedimentary DNA is a powerful proxy 5.1.2 Limitations in sedimentary DNA 5.2 Spatial patterns of vegetation, macrophytes and diatoms 5.2.1 Composition and diversity of vegetation 5.2.2 Composition and diversity of macrophytes 5.2.3 Composition and diversity of diatoms 5.3 Temporal patterns of vegetation, macrophytes and diatoms 5.3.1 Composition and diversity of vegetation 5.3.2 Composition and diversity of macrophytes 5.3.3 Composition and diversity of diatoms 5.4 Outlooks and conclusions Appendices Appendix 1 for Manuscript I Appendix 2 for Manuscript II Appendix 3 for Manuscript III References
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    Call number: AWI Bio-22-94767
    Type of Medium: Dissertations
    Pages: XVIII, 165 Seiten , Illustrationen, Diagramme
    Language: English
    Note: Dissertation, Universität Potsdam, 2021 , Table of Contents Acknowledgements Abstract Zusammenfassung List of figure List of tables List of abbreviation Chapter 1 1. Introduction 1.1 Research background 1.1.1 Response of mountain plant diversity to climate change 1.1.2 Response of Arctic vegetation composition and diversity to climate change 1.1.3 Understanding the critical mechanisms of community assembly are essential for sustaining ecosystem services 1.1.4 Pollen analysis as a traditional tool for representing palaeovegetation 1.1.5. Sedimentary ancient DNA (sedaDNA) is a useful tool for Quaternary ecology tracking 1.2 Study area 1.3 Aims and objectives 1.4 Structure of the thesis 1.4.1 Overview of the chapter 1.4.2 Author's contributions 1.4.3 Methods Chapter 2 2 Manuscript 1: Sedimentary ancient DNA reveals warming-induced alpine habitat loss threat to Tibetan Plateau plant diversity 2.1 Abstract 2.2 Introduction 2.3 Results and discussion 2.4 Methods 2.5 Acknowledgements · Chapter 3 3 Manuscript 2: Holocene vegetation and plant diversity changes in the north-eastern Siberian treeline region from pollen and sedimentary ancient DNA 3.1 Abstract 3.2 Introduction 3.3 Materials and methods 3.3.1 Study area 3.3.2 Lake sediment cores and subsampling 3.3.3 Dating 3.3.4 Pollen analysis 3.3.5 DNA extraction and amplification 3.3.6 Sequencing filtering and taxonomic assignment 3.3.7 Statistical analyses 3.4 Results 3.4.1 Chronology 3.4.2 SedaDNA and pollen assemblages 3.4.3 Gradient analysis and correlation analysis 3.5 Discussion 3 .5.1 Contributions of pollen and sedaDNA to vegetation reconstruction and taxon richness 3.5.2 Variation in Holocene vegetation composition in the Omoloy area, north-eastern Siberia 3.5.3 SedaDNA-based plant diversity changes within lake catchments of the Omoloy region 3.6 Conclusions 3.7 Acknowledgements Chapter 4 4 Manuscript 3: Vegetation reconstruction from Siberia and Tibetan Plateau using modern analogue technique - comparing sedimentary ancient DNA (sedaDNA) and pollen data 4.1 Abstract 4.2 Introduction 4.3 Materials and methods 4.3.1 Sites ofthe modern analogues 4.3.2 Sedimentary (ancient) DNA collection 4.3.3 Metabarcoding data processing and filtering 4.3.4 Pollen data collection 4.3.5 Numerical analysis 4.4 Results 4.4.1 Modern training-set, ROC curve analyses and AT results 4.4.2 Modern analogues for Lake Naleng and Omoloy lake II 4.4.3 Vegetation type reconstruction based on MAT 4.4.4 Projecting fossil samples in ordination space of modern assemblages 4.4.5 Comparing past and present intertaxa relationships 4.5 Discussion 4.5.1 Assessment of analogue quality using modem training-sets 4·5·2 Comparison of sed(a)DNA-based and pollen-based vegetation reconstruction for the Lake Naleng, Tibetan Plateau 4.5.3 Comparison of sedDNA based and pollen-based vegetation reconstruction for the Lake Omoloy, northern Siberia 4.6 Conclusions 4.7 Acknowledgements Chapter 5 5 Manuscript 4: Terrestrial-aquatic ecosystem links on the Tibetan Plateau inferred from sedaDNA shotgun sequencin 5.1 Abstract 5.2 Introduction 5.3 Results 5.4 Discussions 5.5 Methods 5.6 Acknowledgments Chapter 6 6 Synthesis 6.1 The ability of metabarcoding and metagenomic shotgun sequencing to reveal ecological community pattern 6.2 Driver of plant diversity change in high altitude and high latitudes 6.3 High-altitude and high-latitude vegetation type change 6.4 Past terrestrial and aquatic ecological change at ecosystem-scale 6.5 Conclusions and outlook Appendix 1 Appendix-1 Materials for Manuscript #1 1.1 Appendix discussion: Contamination in NTC6 2. Appendix-2 Materials for Manuscript #2 3. Appendix-3 Materials for Manuscript #3 4. Appendix-4 Materials for Manuscript #4 References Eidesstattliche Erklarung
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    Call number: AWI A6-21-94541
    Description / Table of Contents: Stratospheric variability is one of the main potential sources for sub-seasonal to seasonal predictability in mid-latitudes in winter. Stratospheric pathways play an important role for long-range teleconnections between tropical phenomena, such as the quasi-biennial oscillation (QBO) and El Niño-Southern Oscillation (ENSO), and the mid-latitudes on the one hand, and linkages between Arctic climate change and the mid-latitudes on the other hand. In order to move forward in the field of extratropical seasonal predictions, it is essential that an atmospheric model is able to realistically simulate the stratospheric circulation and variability. The numerical weather prediction (NWP) configuration of the ICOsahedral Non-hydrostatic atmosphere model ICON is currently being used by the German Meteorological Service for the regular weather forecast, and is intended to produce seasonal predictions in future. This thesis represents the first extensive evaluation of Northern Hemisphere stratospheric winter circulation in ICON-NWP by analysing a ...
    Type of Medium: Dissertations
    Pages: viii, 119 Seiten , Illustrationen, Diagramme, Karten
    Language: English
    Note: Dissertation, Universität Potsdam, 2020 , Contents1 Introduction 1.1 Motivation: Seasonal prediction 1.2 The new atmosphere model ICON 1.3 Research questions 2 Theoretical background 2.1 Fundamentals of atmospheric circulation 2.1.1 Primitive equations 2.1.2 The global energy budget 2.1.3 Baroclinic instability 2.1.4 Vertical structure of the atmosphere 2.2 Stratospheric dynamics 2.2.1 Circulation patterns 2.2.2 Atmospheric waves 2.2.3 Sudden stratospheric warmings 2.2.4 Quasi-biennial oscillation 2.3 Atmospheric Teleconnections 2.3.1 NAM, NAO and PNA 2.3.2 El Niño-Southern Oscillation 2.3.3 Arctic-midlatitude linkages 3 Atmospheric model and methods of analysis 3.1 Atmospheric model ICON-NWP 3.1.1 Model description 3.1.2 Experimental setup 3.2 Reanalysis data ERA-Interim 3.3 Methods of analysis 3.3.1 NAM index for stratosphere–troposphere coupling 3.3.2 Stratospheric warmings 3.3.3 ENSO index and composites 3.3.4 Bias and error estimation 3.3.5 Statistical significance 4 Results 4.1 Evaluation of seasonal experiments with ICON-NWP 4.1.1 Tropospheric circulation 4.1.2 Stratospheric circulation 4.2 Effect of gravity wave drag parameterisations 4.2.1 Stratospheric effects 4.2.2 Effects on stratosphere-troposphere coupling 4.2.3 Tropospheric effects 4.3 Low latitudinal influence on the stratospheric polar vortex 4.3.1 Quasi-biennial oscillation 4.3.2 El Niño-Southern Oscillation 4.4 Arctic-midlatitude linkages 4.4.1 Tropospheric processes 4.4.2 Stratospheric pathway 4.4.3 Sea ice sensitivity experiment 5 Discussion and outlook Bibliography Appendix
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    Call number: AWI G6-18-91505
    Type of Medium: Dissertations
    Pages: 146 S. , Ill., graph. Darst.
    Language: English
    Note: Groningen, Univ., Diss., 1983 , CONTENTS: INTRODUCTION. - CHAPTER 1. ANALYTICAL AND PREPARATIVE TECHNIQUES. - 1.1. Introduction. - 1.2. Isotope mass spectrometry of H, O and C. - 1.2.1. 2H analysis of H2. - 1.2.2. 18O and 13C analysis of CO2. - 1.3. Preparation of H2 from H2O and organic compounds. - 1.3.1. Combustion and reduction system. - 1.3.1.1. Automated vacuum taps. - 1.3.1.2. Automated cold trap. - 1.3.1.3. Automated combustion. - 1.3.1,4, Membrane pump. - 1.3.2. Performance and results. - 1.3.2.1. H2O samples. - 1.3.2.1. Organic samples. - 1.4. Preparation of CO2 from H2O and organic compounds. - 1.4.1. Introduction. - 1.4.2. Review of the available methods for extracting oxygen. - 1.4.3. Sealed nickel tube pyrolysis. - 1.4.3.1. Principle. - 1.4.3.2. Realization. - 1.4.3.3. Technical details. - 1.4.3.4. Results and calibration. - 1.4.3.5. 18O analysis of some organic pounds 1.4.3.5. δ2H of hydrogen produced by the SNTP method. - 1.5. Preparation of carbon dioxide for 13C analysis. - 1.6. Separation of cellulose from wood and peat. - 1.6.1. Introduction. - 1.6.2. Separation of cellulose from wood. - 1.6.3. Separation of cellulose from peat. - 1.6.4 Nitration and drying of cellulose. - CHAPTER 2. 18O FRACTIONATION BETWEEN CO2 AND H2O. - 2.1. Introduction. - 2.2. 18O analysis of H2O. - 2.3. Equilibration with CO2. - 2.4. Mass spectrometric analyses. - 2.5. Results anddiscussion. - CHAPTER 3. FACTORS AFFECTING THE 2H/1H AND 18O/16O RATIO OF PLANT CELLULOSE. - 3.1. Survey of factors affecting the 2H/1H and 18O/16O ratio. - 3.2. Isotopic composition of precipitation. - 3.3. Leaf-water isotopic enrichment. - 3.3.1. Theoretical. - 3.3.2. Measurement of leaf-water enrichment. - 3.3.2.1. Trees. - 3.3.2.2. Bog plants. - 3.4. Biochemical fractionation. - CHAPTER 4. 2H, 18O AND 13C VARIATIONS IN TREE RINGS. - 4.1. Introduction. - 4.2. Methods and material. - 4.3. Results and discussion. - 4.3.1. Intra-ring variations. - 4.3.1.1. Late wood. - 4.3.1.2. Differences between early wood and late wood. - 4.3.2. Inter-ring variations. - CHAPTER 5. 2H, 18O AND 13C VARIATIONS IN PEAT. - 5.1. Introduction. - 5.2. δ2H, δ18O and δ13C values of bog plants. - 5.2.1. Material and method. - 5.2.2. δ18O and δ2H. - 5.2.3. δ13C 5.3. Engbertsdijksveen I. - 5.3. Introduction. - 5.3.2. Description of the local vegetational succession. - 5.3.3. Cellulose preparation. - 5.3.4. The δ2H and δ18O record. - 5.4. Engbertsdijksveen VII. - 5.4.1. Introduction. - 5.4.2. Description of the local vegetational succession. - 5.4.3. The δ2H and δ18O record. - 5.4.4. The δ13C record. - 5.5. Comparison between Engbertsdijksveen I and VII. - 5.6. Conclusions. - Appendix. - REFERENCES. - SUMMARY. - SAMENVATTING. - ACKNOWLEDGEMENTS.
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  • 27
    Monograph available for loan
    Monograph available for loan
    Palisades : Lamont-Doherty Geological Observatory, Columbia University
    Call number: AWI G2-19-92382
    Type of Medium: Monograph available for loan
    Pages: 690 Seiten , Illustrationen, Karten
    Language: English
    Note: Table of Contents CHAPTER 1 INTERNAL CYCLING AND THROUGHPUT : Pathways from River Mouth to Sea Floor Depth Profiles of Sea Salt Composition Constituent Classification The Chemical Composition of Marine Organic Matter Composition of Particulate Matter Caught in Sediment Traps A Simple Model for Biologically Utilized CDnstituents The Distributions of Biointermediate Constituents Estimation of Input Rates Horizontal Segregation of CDnstituents in the Deep Sea Summary CHAPTER 2 THE SEDIMENTARY SINK Factors Influencing the Distribution of Sedimentary Constituents Introduction Sediment Types Distribution of Opal Production Opal Solution on the Sea Floor Distribution of Calcite in Marine Sediments Degree of Calcite Saturation Variation in the Carbonate Ion Content of Sea Water Spacial Variations in the CaC0 3 Saturation of Sea Water Factors Controlling the Rate of Calcite Solution Thickness and Shape of the Sublysocline Transition Zone Variation of Sediment Type with Time Manganese Nodules Summary CHAPTER 3 THE ATMOSPHERIC IMPRINT : The Cycles of Gases within the Sea Introduction Solubilities of Gases in Sea Water The Rate of Gas Exchange Stagnant Film Thickness Derived from Natural Radiocarbon Stagnant Film Thicknesses Determined by the Radon Method Oxygen Concentrations in Surface Ocean Water Oxygen Deficiencies in the Deep Sea The Marine N2O Cycle Excess Helium The Carbon Dioxide Content of Surface Ocean Water Origin of the Equatorial Pacific CO2 Anomaly Summary CHAPTER 4 REACTIVE METALS AND THE GREAT PARTICULATE SWEEP : The Cycle of Metals in the Sea Introduction Products of Uranium and Thorium Decay Thorium Isotopes in the Sea Protactinium-231 to Thorium-230 Activity Ratios The Distribution of Lead-210 The Distribution of Polonium-210 The Distribution of Radium-226 Anthropogenic Plutonium in the Sea Toward a Model of Metal Transport Distributions of Stable Metals in the Sea Stable Isotope Ratios in Reactive Metals Transport of Iron and Manganese in the Sea Lessons from Controlled Ecosystem Studies Distribution Coefficients Summary CHAPTER 5 HOW FAST DOES THE MILL GRIND? : Rates of Vertical Mixing and Sediment Accumulation Introduction Rate of Vertical Mixing Implication to the Distribution of Radium-226 Distribution of Radiocarbon in the Ocean Rate of Continental Runoff Sediment Accumulation Rates Radiocarbon Dating Uranium Series Dating Beryllium Dating Potassium-Argon Dating Agreement Among Dating Methods Comparison of Model and Observed Rates of CaC0 3 Solution Summary CHAPTER 6 WHAT KEEPS THE SYSTEM IN WHACK? : Control Mechanisms Operating in the Sea Introduction Phosphate Controls Silicate Controls Carbon Controls Interactions between the Phosphate and Carbon Controls Nitrate Controls Dissolved Oxygen Controls Major Anion Controls Major Cation Controls Possible Causes for Perturbations Recorders of Paleoocean Chemistry The Marine Geochemistry of Carbon-13 The Uranium Content of Coral Factors Influencing Nutrient Gradients in the Deep Sea Summary CBAPTER 7 FREIGHT TRAINS AND FICKIAN CONFUSION : The Movement of Water Through the Deep Sea Introduction Types of Motion One Dimensional Advection - Diffusion Model Tracers for Diapycnal and Isopycnal Mixing Mixing Rates Based on Radon-222 and Radium-228 The Distribution of Helium-3 in the Deep Pacific Sources of Deep Water Northern Component Water Conservative Properties of NCW Initial Radiocarbon to Carbon Ratio in NCW Feed for NCW Production Southern Component Water Ventilation of the Deep Atlantic Ocean Ventilation of the Deep Pacific and Indian Oceans The Grand Cycle of Radiocarbon in the Deep Ocean Biological Short-Circuiting Temporal Variations in Radiocarbon Production Argon-39 Summary CHAPTER 8 THE ANTHROPOGENIC INVASION : The Movement of Water Through the Oceanic Thermocline Introduction Input Functions Hydrology of the Main Thermocline Tritium Distribution within the Thermocline Temporal Trends in Tritium Tritium as a Guide to Deep Water Formation Supplementary Information from Strontium-90 Bomb Carbon-14 Distribution within the Thermocline Explanations for Low Equatorial Bomb Carbon-14 Inventories Implications of Equatorial Upwelling to the Tritium Budget An Upwelling Rate Based on the Equatorial CO2 Anomaly Helium-3 Distribution in the Main Oceanic Thermocline Purposeful Tracers Summary CHAPTER 9 ICE SHEETS AND OCEAN PHOSPHATE : Glacial to Interglacial Changes in Ocean Chemistry Introduction Temperature and Salinity Changes Formation and Destruction of Organic Materials Changes in CaCO3 Storage Evidence for an Early Post-Glacial Lysocline Change Changes in Phosphate Concentration The Combined Evidence from Deep Sea Cores Cause of the Oceanic Phosphate Change An Alternate Scenario Wrap Up of the CO2 Record The Oxygen Record Glacial to Interglacial Changes in Ocean Mixing Rate Glacial to Interglacial Lysocline Changes Changes in the Distribution of Nutrients in the Deep Sea Summary CHAPTER 10 CAN MAN OVERRIDE THE CONTROLS? : The Buildup of Fossil Fuel CO2 in the Atmosphere and Oceans Introduction CO2 Production in the Past CO2 Production in the Future Capacity of the Sea for Fossil Fuel CO2 Uptake Utilizable Capacity - Simplified Calculation Utilizable Capacity - Rigorous Calculation Kinetics of Fossil Fuel CO2 Uptake by the Sea Numerical Model crosschecks on the Validity of the Numerical Model Prediction of Future CO2 Levels Solution of Sea Floor Calcite Summary REFERENCES, CONSTANTS, DEFINITIONS, ABBREVIATIONS AND INDEX Introduction to the References Subject Outline for the References Annotated Reference List Frequently Used Constants Definitions of Isotope Notations Abbreviations Index Foldout Caption
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  • 28
    Monograph available for loan
    Monograph available for loan
    Leipzig : Academy of Sciences of the GDR, Central Institute for Isotope and Radiation Research
    Associated volumes
    Call number: AWI G6-19-93042-1
    In: Interregional Training Course on Radiochemistry, [Hauptband]
    Type of Medium: Monograph available for loan
    Pages: 248 Seiten , Illustrationen
    Language: English
    Note: Contents Manual 1.1 Beta measurements 1.2 Measurement of the energy spectrum and range of α-radiation with semiconductor detectors 1.3 Error and statistical tests 1.4 Basic experiments of gamma spectroscopy 2.1 Determination of certain elements in sedimental atmospheric dust by x-ray fluorescence analysis 2.2 Calibration and efficiencies (see Supplement) 2.3 Thin-layer chromatographic separation and test of the purity of labelled compounds 2.4 Separation of Thorium-234 from Uranium-238 2.5 Separation of 137Ca/137mBa by precipitation and sorption 3.1 Determination of phosphate by simple isotope dilution analysis and determination of Zn in MgSO4 by substoichiometric isotope dilution analysis 3.2 The Szilard-Chalmers effect 3.3 Determination of the Ag content in slags by instrumental neutron activation analysis 4.1 Isotope exchange of Ethyl Iodide and Sodium Iodide 4.2 Liquid scintillation counting of Carbon-14 and Tritium 4.3 Autoradiography - Demonstration of Autoradiographic techniques Lectures 1.1 Fundamentals of radioactivity / G. K. Vormum 1.2 Interaction of nuclear radiation with matter / G. K. Vormum 1.4 Equations of radioactive decay / G. K. Vormum 1.5 Radiation detectors / M. Geisler 2.1 Radiation spectroscopy / M. Geisler 2.5 Handling of radioisotopes / G. K. Vormum 2.7 Behaviour of radionuclides in very low concentrations / H. Koch 3.6 Particle sources / J. W. Leonhardt 4.2 Tracers in chemical kinetics / J. Dermietzel 4.4 Liquid Scintillation Counting (LSC) / R. Trettin 5.1 Isotopic tracers in biology / H. Hübner 5.2 Low-level counting / R. Trettin 5.4 Basic concepts of radioimmunoassay (RIA) / G. K. Vormum 6.2 Radionuclide generators / R. Otto
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  • 29
    Call number: AWI E2-21-94416
    Description / Table of Contents: Never before have researchers had the chance to explore the Arctic sea ice as comprehensively as on the international MOSAiC expedition. For an entire year, the research icebreaker Polarstern drifted through the Central Arctic with the sea ice; for an entire year, the men and women of the expedition painstakingly investigated the ice with the aid of cutting-edge technologies. In the ten DriftStories gathered here, they share the challenges they had to overcome, and the discoveries they made in this polar hotspot of climate change: fascinating Arctic research at your fingertips - presented by meereisportal.de.
    Type of Medium: Monograph available for loan
    Pages: 106 Seiten , Illustrationen
    ISBN: 978-3-9822680-3-3 , 978-3-9822680-2-6
    Language: English
    Note: Table of Contents Embarking on the voyage of a century Detective work on ice that’s far too thin For a clearer view from space Shaking and quaking Glittering clouds below the ice One hot strip of ice Snow, the great unknown The snowball litmus test The many faces of cold Algae in the Arctic: Apparently, anything is possible A reunion at the outlet of the Arctic Equipment container Imprint / image credits
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  • 30
    Call number: AWI Bio-21-94540
    Description / Table of Contents: This thesis investigates how the permafrost microbiota responds to global warming. In detail, the constraints behind methane production in thawing permafrost were linked to methanogenic activity, abundance and composition. Furthermore, this thesis offers new insights into microbial adaptions to the changing environmental conditions during global warming. This was assesed by investigating the potential ecological relevant functions encoded by plasmid DNA within the permafrost microbiota. Permafrost of both interglacial and glacial origin spanning the Holocene to the late Pleistocene, including Eemian, were studied during long-term thaw incubations. Furthermore, several permafrost cores of different stratigraphy, soil type and vegetation cover were used to target the main constraints behind methane production during short-term thaw simulations. Short- and long-term incubations simulating thaw with and without the addition of substrate were combined with activity measurements, amplicon and metagenomic sequencing of permanently frozen and seasonally thawed active layer. Combined, it allowed to address the following questions. i) What constraints methane production when permafrost thaws and how is this linked to methanogenic activity, abundance and composition? ii) How does the methanogenic community composition change during long-term thawing conditions? iii) Which potential ecological relevant functions are encoded by plasmid DNA in active layer soils? The major outcomes of this thesis are as follows. i) Methane production from permafrost after long-term thaw simulation was found to be constrained mainly by the abundance of methanogens and the archaeal community composition. Deposits formed during periods of warmer temperatures and increased precipitation, (here represented by deposits from the Late Pleistocene of both interstadial and interglacial periods) were found to respond strongest to thawing conditions and to contain an archaeal community dominated by methanogenic archaea (40% and 100% of all detected archaea). Methanogenic population size and carbon density were identified as main predictors for potential methane production in thawing permafrost in short-term incubations when substrate was sufficiently available. ii) Besides determining the methanogenic activity after long-term thaw, the paleoenvironmental conditions were also found to influence the response of the methanogenic community composition. Substantial shifts within methanogenic community structure and a drop in diversity were observed in deposits formed during warmer periods, but not in deposits from stadials, when colder and drier conditions occurred. Overall, a shift towards a dominance of hydrogenotrophic methanogens was observed in all samples, except for the oldest interglacial deposits from the Eemian, which displayed a potential dominance of acetoclastic methanogens. The Eemian, which is discussed to serve as an analogue to current climate conditions, contained highly active methanogenic communities. However, all potential limitation of methane production after permafrost thaw, it means methanogenic community structure, methanogenic population size, and substrate pool might be overcome after permafrost had thawed on the long-term. iii) Enrichments with soil from the seasonally thawed active layer revealed that its plasmid DNA (‘metaplasmidome’) carries stress-response genes. In particular it encoded antibiotic resistance genes, heavy metal resistance genes, cold shock proteins and genes encoding UV-protection. Those are functions that are directly involved in the adaptation of microbial communities to stresses in polar environments. It was further found that metaplasmidomes from the Siberian active layer originate mainly from Gammaproteobacteria. By applying enrichment cultures followed by plasmid DNA extraction it was possible to obtain a higher average contigs length and significantly higher recovery of plasmid sequences than from extracting plasmid sequences from metagenomes. The approach of analyzing ‘metaplasmidomes’ established in this thesis is therefore suitable for studying the ecological role of plasmids in polar environments in general. This thesis emphasizes that including microbial community dynamics have the potential to improve permafrost-carbon projections. Microbially mediated methane release from permafrost environments may significantly impact future climate change. This thesis identified drivers of methanogenic composition, abundance and activity in thawing permafrost landscapes. Finally, this thesis underlines the importance to study how the current warming Arctic affects microbial communities in order to gain more insight into microbial response and adaptation strategies.
    Type of Medium: Dissertations
    Pages: VI, 243 Seiten , Diagramme, Illustrationen
    Language: English
    Note: Dissertation, Universität Potsdam, 2020 , Contents Preface Acknowledgements Contents Summary Zusammenfassung List of abbreviations Chapter 1. Introduction 1.1 Motivation 1.2 Carbon storage in Arctic permafrost environments and the permafrost carbon feedback (PCF) 1.3 Methane cycling microorganisms 1.4 The microbial ecology of permafrost 1.5 Plasmids and their potential role in stress tolerance 1.6 Objectives Chapter 2. Study sites 2.1 Regional settings 2.2 Kurungnakh and Samoylov Island 2.3 Bol'shoy Lyakhovsky Island 2.4 Herschel Island Chapter 3. Manuscripts 3.1 Overview of manuscripts, including contribution of co-authors. 3.2 Manuscript I Methanogenic response to long-term permafrost thaw is determined by paleoenvironment 3.3 Manuscript II Methane production in thawing permafrost is constrained by methanogenic population size and carbon density 3.4 Manuscript III Metaplasmidome-encoded functional potential of permafrost active layer soils Chapter 4. Synthesis 4.1 Introduction 4.2 Constraints behind methane production from thawing permafrost 4.3 The methanogenic community response to long-term permafrost thaw 4.4 The adaptive potential of the permafrost micro biota to cope with stress factors during global warming 4.5 Conclusion Chapter 5. Future research directions and perspectives Chapter 6. References Chapter 7. Appendix 7.1 Supporting information for manuscript I 7.2 Supporting information for manuscript II 7.3 Supporting information for manuscript III 7.4 ESR collaboration, manuscript IV
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  • 31
    Call number: AWI G8-21-94666
    Description / Table of Contents: Anthropogenic climate change constitutes one of the main global crises in the 21st century. It manifests itself distinctly in global warming and its effects. Forests play an essential role in mitigating the effects of climate change, improving our knowledge of the distribution and changes of terrestrial carbon stocks is vital to mitigate its consequences. Therefore, remote sensing is recommended as one of the tools to ensure systematic and operational forest monitoring. Forests in the Russian Federation are of particular importance as it is the most forested country in the world and at the same time, it is the country with the highest uncertainty when calculating global carbon stocks. Remote sensing is recommended as one of the tools to ensure systematic and operational forest monitoring. It can acquire data over large areas with a high repetition rate and at a relatively low cost. In particular, microwave sensors are recommended as they can provide weather and sun independent, systematic observations with high temporal frequency. The main goal of this cumulative dissertation was to develop methods using new algorithms for estimating parameters for boreal forests from remote sensing data acquired with Synthetic Aperture Radar (SAR). Using the SAR data acquired by the sensor with the longest wavelength available at the moment of writing this dissertation in space, the L-band, methods for estimating the above-ground forest biomass were developed. For this purpose, algorithms for machine learning (ML) were applied and validated. These methods were chosen because they are recommended for large data sets and an incomplete theoretical understanding of processes, e.g., the interaction between the forest and the radar signal, and are relatively new in forest monitoring studies. In addition, efforts have been made to establish improved mapping of large-scale forest cover change
    Type of Medium: Dissertations
    Pages: 234 Seiten , Illustrationen, Diagramme
    Language: English , German
    Note: Content ACKNOWLEDGEMENTS APPENDED PAPERS RELATED PUBLICATIONS FIGURES TABLES I ABBREVIATIONS AND SYMBOLS ABSTRACT ZUSAMMENFASSUNG CHAPTER 1 Introduction 1.1 Importance of forest monitoring 1.2 Remote sensing for forest monitoring 1.3 Scope and structure of this thesis CHAPTER 2 2 Theoretical background & state-of-the-art 2.1 Boreal forests 2.2 Imaging radar theory 2.2.1 Radar principles 2.2.2 Radar scattering 2.2.3 SAR data processing 2.2.4 SAR lnterferometry 2.3 Radar remote sensing of boreal forests 2.3.1 Estimation of aboveground biomass 2.3.2 Monitoring of forest change 2.4 Study area and data 2.4.1 Location of study areas 2.4.2 Processing of in situ data 2.4.3 SAR L-band data: PALSAR & PALSAR-2 2.4.4 SAR C-band data: RADARSAT-2 CHAPTER 3 3 Research rationale 3.1 Research needs 3.2 Research questions CHAPTER 4 4 Research contribution 4.1 Operational forest monitoring in Siberia 4.2 Remote sensing for aboveground biomass estimation in boreal forests 4.3 Non-parametric retrieval of aboveground biomass 4.4 Multi-frequency SAR for estimation of aboveground biomass CHAPTER 5 5 Synthesis 5.1 Discussion and conclusions 5.2 Outlook REFERENCES APPENDIX A: PROCEEDINGS PAPER APPENDIX B: STUDIES ON nI0MASS ESTIMATION IN Il0REAL FORESTS MANUSCRIPT OVERVIEW STATEMENT OF AUTH0RSHIP CURRICULUM VITAE , Zusammenfassungen in deutscher und englischer Sprache
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    Call number: AWI G6-19-92758
    In: 2nd Working Meeting "Radioisotope Application and Radiation Processing in Industry", Abstracts of papers
    Type of Medium: Monograph available for loan
    Pages: 167 Seiten
    Language: English
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  • 33
    Monograph available for loan
    Monograph available for loan
    [Erscheinungsort nicht ermittelbar] : [Verlag nicht ermittelbar]
    Call number: AWI P2-19-92186
    Type of Medium: Monograph available for loan
    Pages: 23 Seiten
    Language: English
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  • 34
    Monograph available for loan
    Monograph available for loan
    [Erscheinungsort nicht ermittelbar] : Department of Science and Technology, Antarctic Division Australia
    Associated volumes
    Call number: AWI P2-86-0256
    In: Antarctic Telecommunications Guidance Manual, Volume 1
    Type of Medium: Monograph available for loan
    Pages: Diverse Seitenangaben (ca. 50 Seiten)
    Language: English
    Note: TABLE OF CONTENTS: Distribution List. - List of acronyms and abbreviations used. - Record of Amendments. - Foreword to 1st Edition. - Foreword to 2nd Edition. - HISTORY AND DEVELOPMENTS OF ANTARCTIC COMMUNICATIONS. - CONSIDERATION OF TELECOMMUNICATIONS BY SCAR AND ANTARCTIC TREATY CONSULTATIVE PARTIES. - OPERATION OF INDIVIDUAL NATIONS' NETWORKS. - Australia's Antarctic Communications. - Japan's Antarctic communications. - UK Antarctic communications. - US Antarctic communications. - ANTARCTIC TREATY RESOLUTIONS ON ANTARCTIC COMMUNICATIONS. - WMO RESOLUTIONS AND PRINCIPLES ON ANTARCTIC COMMUNICATIONS. - Introduction. - Engineering principles of the GTS. - Functions and responsibilities of Meteorological Telecommunications Centres. - Characteristics of the networks of the GTS. - Operational principles of the GTS. - The transmission of meteorological data an the GTS. - Collection and transmission of meteorological data. - Data processing. - Telecommunications system. - Weather reporting by traverse parties. - Automatic weather station in the Antarctic. - AIREP reports. - Mobile ship stations. - OTHER RELEVANT RECOMMENDATIONS AND RESOLUTIONS. - APPENDIXES. - APPENDIX I. - Manual an the Global Data Processing System, Regional Aspects, the Antarctic. - APPENDIX II. - Network of CLIMAT and CLIMAT TEMP reporting stations in the Antarctic. - APPENDIX III. - Results of the monitoring of Antarctic data reception carried out during the period 12-15 March 1982. - APPENDIX IV. - Existing links for the daily international exchange of meteorological data within the Antarctic. - APPENDIX V. - Principal routes by which Antarctic meteorological data enters the GTS. - APPENDIX VI. - List of Antarctic stations and the routing of their meteorological data to the GTS.
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  • 35
    Monograph available for loan
    Monograph available for loan
    Cham : Springer
    Call number: AWI G3-20-93399
    Description / Table of Contents: This book provides a cross-disciplinary overview of permafrost and the carbon cycle by providing an introduction into the geographical distribution of permafrost, with a focus on the distribution of permafrost and its soil carbon reservoirs. The chapters explain the basic physical properties and processes of permafrost soils: ice, mineral and organic components, and how these interact with climate, vegetation and geomorphological processes. In particular, the book covers the role of the large quantities of ice in many permafrost soils which are crucial to understanding carbon cycle processes. An explanation is given on how permafrost becomes loaded with ice and carbon. Gas hydrates are also introduced. Structures and processes formed by the intense freeze-thaw action in the active layer are considered (e.g. ice wedging, cryoturbation), and the processes that occur as the permafrost thaws, (pond and lake formation, erosion). The book introduces soil carbon accumulation and decomposition mechanisms and how these are modified in a permafrost environment. A separate chapter deals with deep permafrost carbon, gas reservoirs and recently discovered methane emission phenomena from regions such as Northwest Siberia and the Siberian yedoma permafrost.
    Type of Medium: Monograph available for loan
    Pages: xv, 508 Seiten , Illustrationen, Diagramme, Karten
    ISBN: 9783030313784
    Language: English
    Note: Contents 1 Introduction 1.1 What Is Permafrost and Where Does it Occur? 1.2 Research on Permafrost: A Shifting Focus from Ice to Carbon 1.3 The Permafrost Carbon Feedback 1.4 Setting the Stage 1.4.1 Climate in Permafrost Areas 1.4.2 Vegetation in Permafrost Areas 1.4.3 Peatlands and Wetlands 1.4.4 Soils 1.4.5 Ice Age Permafrost 1.4.6 Geomorphology 1.5 Recent and Future Climate Change 1.6 The Uncertain Future of Permafrost References 2 The Energy Balance of Permafrost Soils and Ecosystems 2.1 The Radiation Balance 2.2 Latent, Sensible and Conductive Heat Fluxes 2.2.1 Partitioning of the Radiative Flux into Turbulent and Conductive Fluxes 2.2.2 Measurement Uncertainty 2.3 Heat Balance of Vegetation Cover 2.4 Seasonality of the Surface Heat Balance Illustrated by Data 2.4.1 Summer 2.4.2 Winter Cooling 2.4.3 Changes in the Heat Balance and Climate Change 2.5 Ground Heat Flux 2.5.1 Soil Profile Scale 2.5.2 The Effect of Ground Surface Conditions on Soil Temperature and Heat Flux 2.5.3 Large Scale Approaches 2.6 Deeper Permafrost Temperature Profile and Lateral Heat Fluxes 2.7 Lakes and Other Water Bodies References 3 The Role of Ground Ice 3.1 Basic Soil Ice Characteristics 3.2 Ice Segregation and Frost Heave 3.2.1 Ice Segregation Process 3.2.2 Environmental Conditions for Ice Segregation 3.3 Cracking and Wedging 3.3.1 Processes of Ice Wedge Formation 3.3.2 Ice Wedges in the Landscape 3.4 Frost Mounds 3.4.1 Palsas and Similar Features 3.4.2 Pingos 3.5 Cryoturbation and Patterned Ground 3.6 Slope Process: Solifluction and Cryogenic Landslides 3.7 Contribution of Ice to Rock Weathering 3.8 Ice and Hydrology 3.8.1 Active Layer Hydrological Processes 3.8.2 Runoff and River Discharge 3.9 Thaw Lakes 3.9.1 Thaw Lake Formation and Geomorphology 3.9.2 Thaw Lake Disappearance 3.10 Mapping Ice Content References 4 Permafrost Carbon Quantities and Fluxes 4.1 The Ecosystem Carbon Balance 4.1.1 Terrestrial Environments 4.1.2 Lakes 4.1.3 The Greenhouse Gas Balance 4.2 Vegetation Primary Production 4.2.1 Photosynthesis and Carbon Allocation 4.2.2 Primary Production in a Cold Climate 4.3 Vegetation Composition: Effects on the Carbon Cycle 4.4 Carbon Quantity in Permafrost Soils and Frozen Deposits 4.4.1 Yedoma Deposits 4.4.2 Peat 4.4.3 Alluvial and Lake Sediments 4.4.4 Landscape-Scale Variation of the Soil Organic Carbon Stock 4.5 Soil Organic Matter Quality and Decomposition 4.5.1 Organic Matter Quality in Permafrost 4.5.2 Carbon Conservation in Permafrost 4.5.3 Decomposer Communities in Cold and Waterlogged Soils 4.5.4 Organic Matter Decomposition Reaction Rates and Their Dependence on Temperature 4.5.5 Nutrient Cycles and Nitrous Oxide 4.5.6 Ecosystem Methane Emission 4.6 Ecosystem Carbon Flux Data 4.6.1 Quantifying Ecosystem Carbon Fluxes of Permafrost Ecosystems by Surface Measurements 4.6.2 Temporal and Spatial Variability of Permafrost Ecosystem Carbon Fluxes References 5 Permafrost in Transition 5.1 Which Changes? 5.2 Diffuse Permafrost Thaw 5.2.1 Observations of Active Layer Thickness and Surface Subsidence 5.2.2 Relation of Active Layer Thickness with Climate Change 5.2.3 Carbon Cycle Effects of Active Layer and Soil Temperature Change 5.2.4 Self-Heating Effect 5.3 Permafrost Thaw and Geomorphological Change 5.3.1 Thaw Pond and Fen Development 5.3.2 Thaw Lake Expansion 5.3.3 Thaw Lake Carbon Cycle Change 5.3.4 Erosion 5.4 Hydrological Changes 5.4.1 Water Balance: Groundwater Hydrology and Permafrost Thaw 5.4.2 Water Balance: Precipitation and Evapotranspiration 5.4.3 River Discharge Changes and Flooding 5.4.4 Water Transport of Carbon and Nutrients 5.4.5 Soil Hydrology Changes – Wetting or Drying? 5.4.6 Soil Hydrology Changes – Carbon Cycle Effects References 6 Vegetation Change 6.1 Zonal Vegetation Shifts 6.1.1 Present Climate-Related Vegetation Change 6.1.2 Arctic Greening and Browning 6.1.3 Feedbacks on Climate and Soil Temperature 6.1.4 Carbon Balance Effects of Vegetation Change 6.1.5 Fire 6.2 Thawing Permafrost and Vegetation 6.2.1 Effects of Permafrost Thaw on Vegetation: Nutrient Release 6.2.2 Below-Ground Interaction of Root Systems with Nutrients and Soil Carbon 6.2.3 Abrupt Thaw and Vegetation 6.2.4 Resilience 6.3 Human Vegetation Disturbance: Industrialisation and Agriculture References 7 Methane 7.1 Deep CH4 Sources 7.2 Climate Change Related Release of Deep Permafrost CH4 7.3 Cryovolcanism: Gas Emission Craters 7.4 CH4 Emissions in Perspective: Ecosystem Emissons, CO2 and N2O References 8 Models: Forecasting the Present and Future of Permafrost 8.1 Land Surface Models 8.2 Permafrost Models 8.3 The Carbon Cycle in Models 8.4 Geomorphology: Lake Formation and Erosion in Models 8.5 Outlook References Glossary Index
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  • 36
    Monograph available for loan
    Monograph available for loan
    Toronto : University of Toronto Press
    Call number: AWI G3-21-94408
    Description / Table of Contents: In the Anthropocene, the thawing of frozen earth due to global warming has drawn worldwide attention to permafrost. Contemporary scientists define permafrost as ground that maintains a negative temperature for at least two years. But where did this particular conception of permafrost originate, and what alternatives existed? The Life of Permafrost provides an intellectual history of permafrost, placing the phenomenon squarely in the political, social, and material context of Russian and Soviet science. Pey-Yi Chu shows that understandings of frozen earth were shaped by two key experiences in the Russian Empire and the Soviet Union. On one hand, the colonization and industrialization of Siberia nourished an engineering perspective on frozen earth that viewed the phenomenon as an aggregate physical structure: ground. On the other, a Russian and Soviet tradition of systems thinking encouraged approaching frozen earth as a process, condition, and space tied to planetary exchanges of energy and matter. Aided by the US militarization of the Arctic during the Cold War, the engineering view of frozen earth as an obstacle to construction became dominant. The Life of Permafrost tells the fascinating story of how permafrost came to acquire life as Russian and Soviet scientists studied, named, and defined it.
    Type of Medium: Monograph available for loan
    Pages: viii, 288 Seiten , Illustrationen, Diagramme, Karten
    ISBN: 978-1-4875-0193-8
    Language: English
    Note: CONTENTS Introduction: Historicizing Permafrost Permafrost as a historical object Permafrost in Russian and Soviet history Politics, science, and the environment The life cycle of permafrost Choosing words carefully 1 Mapping The cold of eastern Siberia Birth of a scientific object From Boden-Eis to Eisboden Conclusion 2 Building Colonization and construction Building on frozen earth The soil science of roads The ambiguity of merzlota Conclusion 3 Defining Merzlota as aggregate structure Merzlota as process Personal and institutional politics Vechnaia merzlota in Bolshevik culture Conclusion 4 Adapting From commission to institute Rhetoric of transforming nature Adapting to frozen earth Survival of the systems approach Conclusion 5 Translating Birth of permafrost Criticism and self-criticism From merzlotovedenie to geocryology The dialectic persists Conclusion Epilogue: Resurrecting Acknowledgments Glossary Notes Bibliography Index
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  • 37
    Monograph available for loan
    Monograph available for loan
    Cham : Springer International Publishing
    Call number: AWI Bio-22-94853
    Description / Table of Contents: This multidisciplinary book discusses the manifold challenges arctic marine and terrestrial wildlife, ecosystems and people face these times. Major health threats caused by the consequences of climate change, environmental pollution and increasing tourism in northern regions around the globe are explored. The most common infectious diseases in wild and domesticated arctic animals are reviewed and the impact they could have on circumpolar ecosystems as well as on the lives of arctic people are profoundly discussed. Moreover, the book reviews arctic hunting, herding and food conservation strategies and introduces veterinary medicine in remote indigenous communities. "Arctic One Health" is authored by experts based in arctic regions spanning from North America over Europe to Asia to cover a broad range of topics and perspectives. The book addresses researchers in Veterinary Medicine, Ecology, Microbiology and Anthropology. The book contributes towards achieving the UN Sustainable Developmental Goals, in particular SDG 15, Life on Land.
    Type of Medium: Monograph available for loan
    Pages: XIX, 573 Seiten , Illustrationen
    ISBN: 978-3-030-87852-8
    Language: English
    Note: Contents Part I Introduction The Arctic Region and Its Inhabitants / Anastasia Emelyanova A Holistic Approach to One Health in the Arctic / Arleigh Reynolds, Susan Kutz, Tessa Baker Seasonal Animal Migrations and the Arctic: Ecology, Diversity, and Spread of Infectious Agents / Øystein Varpe, Silke Bauer Part II Major Health Threats to Arctic Animals and People Climate Change in Northern Regions / Bob van Oort, Marianne Tronstad Lund, Anouk Brisebois Loss of Untouched Land / Roland Pape Arctic Ecosystems, Wildlife and Man: Threats from Persistent Organic Pollutants and Mercury / Christian Sonne, Robert James Letcher, Bjørn Munro Jenssen, Rune Dietz Oil Spills in the Arctic / Sadie K. Wright, Sarah Allan, Sarah M. Wilkin, Michael Ziccardi Nuclear Radiation / Birgitta Åhman Part III Arctic Zoonoses: Diseases Transmitted from Animals to Man Rabies in the Arctic / Karsten Hueffer, Morten Tryland, Svetlana Dresvyanikova Brucellosis in the Arctic and Northern Regions / Xavier Fernandez Aguilar, Ingebjørg H. Nymo, Kimberlee Beckmen, Svetlana Dresvyanikova, Irina Egorova, Susan Kutz Anthrax in the North / Karsten Hueffer, Svetlana Dresvyanikova, Irina Egorova Cystic and Alveolar Echinococcosis Caused by Echinococcus canadensis and E. multilocularis in the Arctic / Temitope U. Kolapo, Antti Oksanen, Rebecca Davidson, Emily J. Jenkins Toxoplasmosis in Northern Regions / Émilie Bouchard, Pikka Jokelainen, Rajnish Sharma, Heather Fenton, Emily J. Jenkins Trichinella spp. in the North / Rajnish Sharma, Edoardo Pozio, Émilie Bouchard, Emily J. Jenkins Cryptosporidiosis and Giardiosis in the Arctic: Increasing Threats in a Warmer World? / Lucy J. Robertson, John J. Debenham Erysipelas in Arctic and Northern Regions / Fabien Mavrot, O. Alejandro Aleuy, Taya Forde, Susan J. Kutz Tularemia in the Arctic / Cristina M. Hansen, Svetlana Dresvyannikova Orthohantaviruses in the Arctic: Present and Future / Frauke Ecke, Magnus Magnusson, Barbara A. Han, Magnus Evander Zoonotic Marine Helminths: Anisakid Nematodes and Diphyllobothriid Cestodes / Heather Fenton Parapoxvirus Infections in Northern Species and Populations / Morten Tryland Part IV Harvesting the Arctic: Potential Health Threats for Arctic People Hunting with Lead Ammunition: A One Health Perspective / Jon M. Arnemo, Boris Fuchs, Christian Sonne, Sigbjørn Stokke Traditional Conservation Methods and Food Habits in the Arctic / Raphaela Stimmelmayr, Gay Sheffield Part V Working with Arctic Communities Wildlife Health Surveillance in the Arctic / Sylvia L. Checkley, Matilde Tomaselli, Nigel Caulkett Dogs and People: Providing Veterinary Services to Remote Arctic Communities / Tessa Baker, Laurie Meythaler-Mullins, Arleigh Reynolds, Susan Kutz Semi-Domesticated Reindeer, Health, and Animal Welfare / Morten Tryland
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  • 38
    Monograph available for loan
    Monograph available for loan
    Bonn : Federal Republic of Germany, Press and Public Relations Department
    Call number: AWI P6-18-91970
    Type of Medium: Monograph available for loan
    Pages: iv, 169 Seiten
    Language: English
    Note: CONTENTS: Introduction. - International co-operation. - Intergovernmental co-operation. - Non-governmental co-operation. - I. Scientific Programme. - 1. Astronomy. - 2. Biological Sciences. - 2.1 The marine ecosystem and its living resources. - 2.1.1 Food resources, phytoplankton production and zooplankton. - 2.1.2 The role of the benthos. - 2.1.3 The role of micro-organisms. - 2.1.4 Distribution and incidence of seals in the pack-ice of the Weddell Sea. - 2.1.5 Distribution and life history of fishes. - 2.1.6 Large-scaie distribution and drift of krill. - 2.1.7 Composition and behaviour of krill shoals. - 2.1.8 Preservation and processing of krill. - 2.2 The adaptation of antarctic marine organisms to their environment. - 2.2.1 Experiments and marine studies on .the ecophysiology of krill. - 2.2.2 Temperature regulation and food requirements of warm-blooded antarctic animals. - 2.2.3 Growth, digestive system and food economy of antarctic fishes. - 2.2.4 Freezing resistance of sea animals. - 2.2.5 Taxonomy of antarctic marine organisms. - 2.3 Terrestrial biology in Antarctica. - 2.3.1 Temperature adjustments in the reproductive biology of antarctic birds. - 2.3.2 Biochemical bases of growth processes in poikilothermic organisms at very low temperatures. - 2.3.3 Nutritional biology of poikilothermic herbivora. - 2.3.4 Study of lichens, fungi and bacteria in Antarctica and on offshore islands. - 2.3.5 Photosynthesis and heterotrophic life cycle of plants at very low temperatures. - 2.4 Environmental protection in Antarctica. - 2.5 Human biology and medicine in polar regions. - 3. Geodesy, Cartography and Remote Sensing. - 3.1 Satellite geodesy. - 3.2 Doppler satellite positioning. - 3.3 Geodetic mapping of ice-free areas. - 3.4 Remote-sensing by satellite. - 4. Geology and Geophysics. - 4.1 Study of drift processes as a contribution to the geological history of Antarctica. - 4.1.1 Study of magnetic structures by means of aeromagnetic photography. - 4.1.2 Paleomagnetic studies of drift evolution. - 4.1.3 Micro-earthquakes as indicators of tectonic activity. - 4.1.4 Earth tides and natural oscillations of the earth. - 4.2 Studies of the structure of crust and mantle. - 4.2.1 Structure of the basement complex of the transantarctic mountain chain in the area east of the Filchner Ice Shelf. - 4.2.2 Structure of the basement of the Weddell Sea, the Filchner/Ronne Ice Shelf, and the peripheral area. - 4.2.3 Oldest and highly metamorphous rocks of the East Antarctic. - 4.3 Stratigraphy, tectonics and magmatism in the mobile areas. - 4.3.1 Mobile fringe areas of the East Antarctic. - 4.3.2 Paleozoic and mesozoic mountains(Beacon upper group) in the transantarctic mountains. - 4.3.3 Early paleozoic to cainozoic orogenes in the area around the Filchner/Ronne Ice Shelf. - 4.4 Study of exogenous processes under extremely cold conditions. - 4.4.1 Glacial geology and geomorphology. - 4.4.2 Weathering and detrital formation. - 4.5 Geoscientific marine research. - 5. Glaciology. - 5.1 Volume and dynamics of the Filchner/Ronne Ice Shelf. - 5.2 Determining the extent and thickness of the ice and its temporal variation in the Filchner/Ronne Ice Shelf sector and peripheral areas. - 5.3 Determining the composition and inner structure of the Filchner/Ronne Ice Shelf on the basis of geophysical surface measurements. - 5.4 Studies of the dynamics of the pack-ice in the Weddell Gyre. - 5.5 Physical characteristics of ocean ice. - 5.6 Glaciological drillings. - 5.7 Chemical composition and accumulation genesis of antarctic background aerosol; global transport of trace gases and aerosols. - 5.8 Study of the elastic and rheological characteristics of ice, its heat conductability and texture affected by deformation. - 6. Upper Atmosphere and Extraterrestrial Physics. - 6.1 Investigation of whistlers and VLF radio emissions (chorus, hiss, etc) at conjugated points. - 6.2 Study of terresterial magnetic pulsations at conjugated points. - 6.3 Study of atmospherics to obtain more precise data on worldwide thunderstorms. - 6.4 Measurements of the aero-electric field. - 6.5 Balloon-based study of the ionosphere in the light of Mg t resonance lines. - 6.6 Measurement of the vertical distribution of ozone, steam and aerosol up to an altitude of 30 km. - 6.7 Measurements of emission in the infrared 9.6 µ ozone band from the ground. - 6.8 Other projects which may be carried out simultaneously with the above or later. - 6.9 Proposed basic terrestrial magnetic equipment for the Antarctic Station. - 6.10 Meteorite search expedition. - 6.11 Study of micrometeorites and cosmic dust. - 7. Meteorology and Oceanography. - 7.1 Meteorology. - 7.1.1 Atmospheric boundary stratum. - 7.1.2 Study of stratospheric circulation. - 7.1.3 Measurement of trace gases over long periods. - 7.1.4 Other research projects. - 7.1.5 Weather service observations and consultations. - 7.1.6 Basic meteorological equipment for the Antarctic Station. - 7.2 Physical oceanography. - 7.2.1 Formation and extent of bottom water in the Atlantic sector of the circumantarctic ocean. - 7.2.2 Numeric simulation of the vertical flows of material, energy and impulses. - 7 2.3 Time scales of transportation in deep water with the aid of radioactive trace elements. - 7.2.4 Detection of heavy metals in the Antarctic Ocean. - 7.2.5 Fishery oceanography in circumantarctic waters. - 7.2.6 Other research projects. - 8. Engineering Sciences. - 8.1 Shipbuilding technology. - 8.1.1 Measuring and testing programme regarding the performance of vessels in ice and technical developments in the construction of ice-going vessels. - 8.2 Iceberg location and navigation. - 8.2.1 Iceberg location. - 8.2.2 Development of precision positioning systems (also for dynamic positioning) to ensure noninterference with signals transmitted through ice and water masses of different thicknesses. - 8.3 Construction techniques. - 8.4 Exploration techniques. - 8.5 Other topics. - The Antarctic Research Station. - The Polar Research and Supply Ship. - The Polar Research Institute. - Institutions contributing to the Programme.
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  • 39
    Monograph available for loan
    Monograph available for loan
    Leipzig : Academy of Sciences of the GDR, Central Institute for Isotope and Radiation Research
    Associated volumes
    Call number: AWI G6-19-93042-2
    In: Interregional Training Course on Radiochemistry, [Supplement]
    Type of Medium: Monograph available for loan
    Pages: 88 Seiten , Illustrationen
    Language: English
    Note: Contents Manual 2.2 The relative measurement of aktivity Lectures 1.3 Statistics / H. Baumbach 2.2 Sealed sources / K. Vormum 2.4 Energy dispersive x-ray fluorescence analysis / H.-K. Bothe 3.1 The use of carriers / H. Koch 4.3 Autoradiography / K. Freyer 6.1 Radiometric methods in environmental control / H.-J. Große
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  • 40
    Monograph available for loan
    Monograph available for loan
    [Aarhus] : Aarhus University, DCE - Danish Centre for Environment and Energy
    Call number: AWI P5-20-93484
    Type of Medium: Monograph available for loan
    Pages: 189 Seiten , Illustrationen
    Edition: third edition
    ISBN: 978-87-93129-15-3
    Language: English
    Note: INTERACT STATIONS SVALBARD, NORWAY 1 AWIPEV Arctic Research base 2 CNR Arctic Station "Dirigibile ltalia" 3 Ny-Ålesund Research Station- Sverdrup 4 UK Arctic Research Station 5 Netherlands' Arctic Station 6 Adam Mickiewicz University Polar Station - Petuniabukta 7 Czech Arctic Research Station of Josef Svoboda 8 Polish Polar Station, Hornsund NORWAY 9 Finse Alpine Research Centre 10 Nibio Svanhovd Research Station SWEDEN 11 Svartberget Research Station 12 Tarfala Research Station 13 Abisko Scientific Research Station FINLAND 14 Kilpisjarvi Biological Station 15 Pallas-Sodankyla Stations 16 Kolari Research Unit 17 Hyytiälä Forest Research Station 18 Kainuu Fisheries Research Station 19 Oulanka Research Station 20 Varrio Subarctic Research Station 21 Kevo Subarctic Research Station SWITZERLAND 22 Alpine Research and Education Station Furka AUSTRIA 23 Station Hintereis 24 Sonnblick Observatory CZECH REPUBLIC 25 Krkonose Mountains National Park POLAND 26 Karkonosze Mountains National Park 27 M&M Klapa Research Station RUSSIA 28 Lammin-Suo Peatland Station 29 Khibiny Educational and Scientific Station 30 The Arctic Research Station 31 Mukhrino Field Station 32 Numto Park Station 33 Khanymey Research Station 34 Beliy Island Research Station 35 Willem Barentsz Biological Station 36 lgarka Geocryology Laboratory 37 Kajbasovo Research Staton 38 Aktru Research Station 39 Evenkian Field Station 40 International Ecological Educational Center "lstomino" 41 Research Station Samoylov Island 42 Spasskaya Pad Scientific Forest Station 43 Elgeeii Scientific Forest station 44 Chokurdakh Scientific Tundra Station 45 Orotuk Field Station 46 AvachinskyVolcano Field Station 47 North-East Science Station 48 Meinypil'gyno Community Based Biological Station KYRGYZ REPUBLIC 49 Adygine Research Station ALASKA 50 Barrow Arctic Research Center/Barrow Environmental Observatory 51 Toolik Field Station CANADA 52 Kluane Lake Research Station 53 Western Arctic Research Centre 54 Canadian High Arctic Research Station 55 M'Clintock Channel Polar Research Cabins 56 Churchill Northern Studies Centre 57 Flashline Mars Arctic Research Station 58 Polar Environment Atmospheric Research Laboratory 59 CEN Ward Hunt Island Research Station 60 CEN Bylot Island Field Station 61 lgloolik Research Center 62 CEN Salluit Research Station 63 CEN Boniface River Field Station 64 CEN Umiujaq Research Station 65 CEN Whapmagoostui-Kuujjuarapik Research Station 66 CEN Radisson Ecological Research Station 67 CEN Clearwater Lake Research Station 68 Nunavut Research Institute 69 CEN Kangiqsualujjuaq Sukuijarvik Research Station 70 Uapishka Research Station 71 Labrador Institute Research Station GREENLAND 72 DMI Geophysical Observatory- Qaanaaq 73 Arctic Station 74 Arctic DTU, ARTEK Research Station 75 Greenland Institute of Natural Resources 76 Sermilik Research Station 77 Summit Station 78 EGRIP Field Station 79 Zackenberg Research Station 80 Villum Research Station ICELAND 81 Sudurnes Science and Learning Center 82 Litla-Skard 83 China-lceland Arctic Observatory 84 Rif Field Station 85 Skálanes Nature and Heritage Center FAROE ISLANDS 86 Faroe Islands Nature Investigation SCOTLAND 87 ECN Cairngorms
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  • 41
    Call number: AWI G3-23-95073
    Description / Table of Contents: The Arctic is changing rapidly and permafrost is thawing. Especially ice-rich permafrost, such as the late Pleistocene Yedoma, is vulnerable to rapid and deep thaw processes such as surface subsidence after the melting of ground ice. Due to permafrost thaw, the permafrost carbon pool is becoming increasingly accessible to microbes, leading to increased greenhouse gas emissions, which enhances the climate warming. The assessment of the molecular structure and biodegradability of permafrost organic matter (OM) is highly needed. My research revolves around the question “how does permafrost thaw affect its OM storage?” More specifically, I assessed (1) how molecular biomarkers can be applied to characterize permafrost OM, (2) greenhouse gas production rates from thawing permafrost, and (3) the quality of OM of frozen and (previously) thawed sediments. I studied deep (max. 55 m) Yedoma and thawed Yedoma permafrost sediments from Yakutia (Sakha Republic). I analyzed sediment cores taken below thermokarst lakes on the Bykovsky Peninsula (southeast of the Lena Delta) and in the Yukechi Alas (Central Yakutia), and headwall samples from the permafrost cliff Sobo-Sise (Lena Delta) and the retrogressive thaw slump Batagay (Yana Uplands). I measured biomarker concentrations of all sediment samples. Furthermore, I carried out incubation experiments to quantify greenhouse gas production in thawing permafrost. I showed that the biomarker proxies are useful to assess the source of the OM and to distinguish between OM derived from terrestrial higher plants, aquatic plants and microbial activity. In addition, I showed that some proxies help to assess the degree of degradation of permafrost OM, especially when combined with sedimentological data in a multi-proxy approach. The OM of Yedoma is generally better preserved than that of thawed Yedoma sediments. The greenhouse gas production was highest in the permafrost sediments that thawed for the first time, meaning that the frozen Yedoma sediments contained most labile OM. Furthermore, I showed that the methanogenic communities had established in the recently thawed sediments, but not yet in the still-frozen sediments. My research provided the first molecular biomarker distributions and organic carbon turnover data as well as insights in the state and processes in deep frozen and thawed Yedoma sediments. These findings show the relevance of studying OM in deep permafrost sediments.
    Type of Medium: Dissertations
    Pages: xxiii, 178 Seiten , Illustrationen, Diagramme, Karten
    Language: English
    Note: Table of Contents Abstract Zusammenfassung Samenvatting Acknowledgements List of Figures List of Tables List of Abbreviations 1 Introduction 1.1 Motivation 1.2 Aims and research questions 1.3 Scientific background 1.3.1 The Arctic in a changing climate 1.3.2 Northern Hemisphere permafrost region 1.3.3 Permafrost degradation 1.3.3.1 Thermokarst development 1.3.3.2 Retrogressive thaw slumps 1.3.4 Organic matter in permafrost deposits 1.4 Material and methods 1.4.1 Study sites 1.4.2 Main laboratory methods 1.5 Thesis structure 1.6 Overview of publications 1.6.1 Publication “n-Alkane Characteristics of Thawed Permafrost Deposits Below a Thermokarst Lake on Bykovsky Peninsula, Northeastern Siberia” 1.6.2 Publication “Greenhouse gas production and lipid biomarker distribution in Yedoma and Alas thermokarst lake sediments in Eastern Siberia” 1.6.3 Publication “Organic matter characteristics of a rapidly eroding permafrost cliff in NE Siberia (Lena Delta, Laptev Sea region)” 1.6.4 Publication “Molecular biomarkers in Batagay megaslump permafrost deposits reveal clear differences in organic matter preservation between glacial and interglacial periods” 1.6.5 Contributions to complementary research 2 Bykovsky Peninsula 2.1 Abstract 2.2 Introduction 2.3 Study area 2.4 Material and methods 2.4.1 Field work 2.4.2 Laboratory analyses 2.4.2.1 Biomarker analysis 2.4.2.2 Biomarker indices 2.5 Results 2.5.1 Bulk sediment 2.5.1.1 Long core PG2412 2.5.1.2 Short core PG2420 2.5.2 Hydrochemistry 2.5.3 n-Alkane distributions 2.6 Discussion 2.6.1 Depositional history at the study site 2.6.1.1 Unit I - Early Weichselian fluvial sedimentation 2.6.1.2 Unit II – Yedoma deposition in wetland landscapes dominated by low-centered polygons 2.6.1.3 Unit III/Unit A – Yedoma deposition under cold-dry conditions during the Late Weichselian 2.6.1.4 Unit IV/Unit B – Holocene thermokarst lake formation and lacustrine sedimentation 2.6.2 Organic matter degradation 2.7 Conclusion 2.8 Acknowledgements 3 Yukechi Alas 3.1 Abstract 3.2 Introduction 3.3 Methods and materials 3.3.1 Study area 3.3.2 Field work 3.3.3 Laboratory analyses 3.3.3.1 Organic carbon content 3.3.3.2 Lipid biomarkers 3.3.4 Incubations 3.3.5 Statistical analysis 3.4 Results 3.4.1 Organic matter characteristics 3.4.1.1 Alas lake sediment core YU-L7 3.4.1.2 Yedoma lake sediment core YU-L15 3.4.2 Greenhouse gas production 3.4.2.1 Alas lake sediment core YU-L7 3.4.2.2 Yedoma lake sediment core YU-L15 3.4.2.3 Carbon mineralization 3.4.3 Statistical correlation and regression 3.5 Discussion 3.5.1 Organic matter degradation potential 3.5.1.1 Organic carbon quantity 3.5.1.2 Organic matter preservation and talik formation 3.5.1.3 Presence of methanogenic communities 3.5.2 Greenhouse gas production 3.5.2.1 Carbon dioxide production 3.5.2.2 Methane production 3.5.3 GHG links with other parameters and outlook 3.6 Conclusion 3.7 Acknowledgements 4 Sobo-Sise cliff 4.1 Abstract 4.2 Introduction 4.3 Study area 4.4 Methods 4.4.1 Fieldwork 4.4.2 Sedimentological organic matter parameters 4.4.3 Lipid biomarkers 4.4.3.1 Extraction and fraction separation 4.4.3.2 GC-MS measurements and compound quantification 4.4.4 Biomarker indices 4.4.4.1 Average Chain Length 4.4.4.2 Carbon Preference Index 4.4.4.3 Higher Plant Fatty Acids 4.4.5 Data analysis 4.5 Results 4.5.1 Sedimentological organic matter parameters 4.5.2 Biomarkers 4.5.2.1 n-Alkanes 4.5.2.2 Fatty acids 4.5.3 Clustering 4.6 Discussion 4.6.1 Terrestrial depositional environment 4.6.1.1 Organic matter source 4.6.1.2 Organic matter quality 4.6.2 Implications and outlook 4.7 Conclusion 4.8 Acknowledgements 5 Batagay thaw slump 5.1 Abstract 5.2 Introduction 5.3 Study site 5.4 Methods 5.4.1 Sample collection 5.4.2 Laboratory analyses 5.5 Results 5.5.1 Detected biomolecules 5.5.2 Lower Ice Complex 5.5.3 Lower Sand Unit 5.5.4 Woody Layer 5.5.5 Upper Ice Complex - Yedoma 5.5.6 Holocene Cover 5.6 Discussion 5.6.1 Biogeochemical legacy of glacial periods 5.6.2 Biogeochemical legacy of interglacial periods 5.6.3 Modern organic matter mobilization in the Batagay megaslump 5.7 Conclusion 5.8 Acknowledgements 6 Synthesis 6.1 Lipid biomarkers to characterize permafrost organic matter 6.1.1 Organic matter source 6.1.2 Organic matter quality 6.2 Mobilization of organic matter in thawing permafrost 6.2.1 Methane production vs. emission 6.2.2 Using the data in models 6.2.3 Transport of OM into aquatic systems 6.3 Recommendations for future research References Appendix A Supporting information for Chapter 2 Appendix B Supporting information for Chapter 3 Appendix C Supporting information for Chapter 4 Appendix D Supporting information for Chapter 5
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  • 42
    Call number: ZSP-558-6 ; MOP 46209 / Mitte
    In: Middle atmosphere program
    Type of Medium: Series available for loan
    Pages: V, 106 S. : graph. Darst.
    Language: English
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  • 43
    Call number: ZSP-558-10 ; MOP 46209 / Mitte
    In: Middle atmosphere program
    Type of Medium: Series available for loan
    Pages: 220 S. : Ill., graph. Darst.
    Language: English
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  • 44
    Call number: ZSP-558-11 ; MOP 46209 / Mitte
    In: Middle atmosphere program
    Type of Medium: Series available for loan
    Pages: 146 S.
    Language: English
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  • 45
    Monograph available for loan
    Monograph available for loan
    Copenhagen : Nyt Nordisk Forl.
    Associated volumes
    Call number: ZSP-553-9
    In: Meddelelser om Grønland
    Type of Medium: Monograph available for loan
    Pages: 36 S. : Ill.
    ISBN: 8717029635
    ISSN: 0106-1054
    Series Statement: Meddelelser om Grønland : Bioscience 9
    Language: English
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  • 46
    Call number: ZSP-558-3 ; MOP 46209 / Mitte
    In: Middle atmosphere program
    Type of Medium: Series available for loan
    Pages: III, 187 S. : graph. Darst.
    Language: English
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  • 47
    Call number: AWI Bio-22-94840
    Description / Table of Contents: Vegetation change at high latitudes is one of the central issues nowadays with respect to ongoing climate changes and triggered potential feedback. At high latitude ecosystems, the expected changes include boreal treeline advance, compositional, phenological, physiological (plants), biomass (phytomass) and productivity changes. However, the rate and the extent of the changes under climate change are yet poorly understood and projections are necessary for effective adaptive strategies and forehanded minimisation of the possible negative feedbacks. The vegetation itself and environmental conditions, which are playing a great role in its development and distribution are diverse throughout the Subarctic to the Arctic. Among the least investigated areas is central Chukotka in North-Eastern Siberia, Russia. Chukotka has mountainous terrain and a wide variety of vegetation types on the gradient from treeless tundra to northern taiga forests. The treeline there in contrast to subarctic North America and north-western and central Siberia is represented by a deciduous conifer, Larix cajanderi Mayr. The vegetation varies from prostrate lichen Dryas octopetala L. tundra to open graminoid (hummock and non-hummock) tundra to tall Pinus pumila (Pall.) Regel shrublands to sparse and dense larch forests. Hence, this thesis presents investigations on recent compositional and above-ground biomass (AGB) changes, as well as potential future changes in AGB in central Chukotka. The aim is to assess how tundra-taiga vegetation develops under changing climate conditions particularly in Fareast Russia, central Chukotka. Therefore, three main research questions were considered: 1) What changes in vegetation composition have recently occurred in central Chukotka? 2) How have the above-ground biomass AGB rates and distribution changed in central Chukotka? 3) What are the spatial dynamics and rates of tree AGB change in the upcoming millennia in the northern tundra-taiga of central Chukotka? Remote sensing provides information on the spatial and temporal variability of vegetation. I used Landsat satellite data together with field data (foliage projective cover and AGB) from two expeditions in 2016 and 2018 to Chukotka to upscale vegetation types and AGB for the study area. More specifically, I used Landsat spectral indices (Normalised Difference Vegetation Index (NDVI), Normalised Difference Water Index (NDWI) and Normalised Difference Snow Index (NDSI)) and constrained ordination (Redundancy analysis, RDA) for further k-means-based land-cover classification and general additive model (GAM)-based AGB maps for 2000/2001/2002 and 2016/2017. I also used Tandem-X DEM data for a topographical correction of the Landsat satellite data and to derive slope, aspect, and Topographical Wetness Index (TWI) data for forecasting AGB. Firstly, in 2016, taxa-specific projective cover data were collected during a Russian-German expedition. I processed the field data and coupled them with Landsat spectral Indices in the RDA model that was used for k-means classification. I could establish four meaningful land-cover classes: (1) larch closed-canopy forest, (2) forest tundra and shrub tundra, (3) graminoid tundra and (4) prostrate herb tundra and barren areas, and accordingly, I produced the land cover maps for 2000/2001/2002 and 2016/20017. Changes in land-cover classes between the beginning of the century (2000/2001/2002) and the present time (2016/2017) were estimated and interpreted as recent compositional changes in central Chukotka. The transition from graminoid tundra to forest tundra and shrub tundra was interpreted as shrubification and amounts to a 20% area increase in the tundra-taiga zone and 40% area increase in the northern taiga. Major contributors of shrubification are alder, dwarf birch and some species of the heather family. Land-cover change from the forest tundra and shrub tundra class to the larch closed-canopy forest class is interpreted as tree infilling and is notable in the northern taiga. We find almost no land-cover changes in the present treeless tundra. Secondly, total AGB state and change were investigated for the same areas. In addition to the total vegetation AGB, I provided estimations for the different taxa present at the field sites. As an outcome, AGB in the study region of central Chukotka ranged from 0 kg m-2 at barren areas to 16 kg m-2 in closed-canopy forests with the larch trees contributing the highest. A comparison of changes in AGB within the investigated period from 2000 to 2016 shows that the greatest changes (up to 1.25 kg m 2 yr 1) occurred in the northern taiga and in areas where land cover changed to larch closed-canopy forest. Our estimations indicate a general increase in total AGB throughout the investigated tundra-taiga and northern taiga, whereas the tundra showed no evidence of change in AGB within the 15 years from 2002 to 2017. In the third manuscript, potential future AGB changes were estimated based on the results of simulations of the individual-based spatially explicit vegetation model LAVESI using different climate scenarios, depending on Representative Concentration Pathways (RCPs) RCP 2.6, RCP 4.5 and RCP 8.5 with or without cooling after 2300 CE. LAVESI-based AGB was simulated for the current state until 3000 CE for the northern tundra-taiga study area for larch species because we expect the most notable changes to occur will be associated with forest expansion in the treeline ecotone. The spatial distribution and current state of tree AGB was validated against AGB field data, AGB extracted from Landsat satellite data and a high spatial resolution image with distinctive trees visible. The simulation results are indicating differences in tree AGB dynamics plot wise, depending on the distance to the current treeline. The simulated tree AGB dynamics are in concordance with fundamental ecological (emigrational and successional) processes: tree stand formation in simulated results starts with seed dispersion, tree stand establishment, tree stand densification and episodic thinning. Our results suggest mostly densification of existing tree stands in the study region within the current century in the study region and a lagged forest expansion (up to 39% of total area in the RCP 8.5) under all considered climate scenarios without cooling in different local areas depending on the closeness to the current treeline. In scenarios with cooling air temperature after 2300 CE, forests stopped expanding at 2300 CE (up to 10%, RCP 8.5) and then gradually retreated to their pre-21st century position. The average tree AGB rates of increase are the strongest in the first 300 years of the 21st century. The rates depend on the RCP scenario, where the highest are as expected under RCP 8.5. Overall, this interdisciplinary thesis shows a successful integration of field data, satellite data and modelling for tracking recent and predicting future vegetation changes in mountainous subarctic regions. The obtained results are unique for the focus area in central Chukotka and overall, for mountainous high latitude ecosystems.
    Type of Medium: Dissertations
    Pages: 149 Seiten , Illustrationen, Diagramme
    Language: English
    Note: Dissertation, Potsdam, Universität Potsdam, 2022 , Contents Abstract Zusammenfassung Contents Abbreviations Motivation 1 Introduction 1.1 Scientific background 1.2 Study region 1.3 Aims and objectives 2 Materials and methods 3.1 Section 4 - Strong shrub expansion in tundra-taiga, tree infilling in taiga and stable tundra in central Chukotka (north-eastern Siberia) between 2000 and 2017 3.2 Section 5 - Recent above-ground biomass changes in central Chukotka (NE Siberia) combining field-sampling and remote sensing 3.3 Section 6 - Future spatially explicit tree above-ground biomass trajectories revealed for a mountainous treeline ecotone using the individual-based model LAVESI 4 Strong shrub expansion in tundra-taiga, tree infilling in taiga and stable tundra in central Chukotka (north-eastern Siberia) between 2000 and 2017 Abstract 1 Introduction 2 Materials and methods 2.1 Field data collection and processing 2.2 Landsat data, pre-processing and spectral indices processing 2.3 Redundancy analysis (RDA) and classification approaches 3 Results 3.1 General characteristics of the vegetation field data 3.2 Relating field data to Landsat spectral indices in the RDA model 3.3 Land-cover classification 3.4 Land-cover change between 2000 and 2017 4 Discussion 4.1 Dataset limitations and optimisation 4.2 Vegetation changes from 2000/2001/2002 to 2016/2017 Conclusions Acknowledgements Data availability statement References Appendix A. Detailed description of Landsat acquisitions Appendix B. MODIS NDVI time series from 2000 to 2018 Appendix C. Landsat Indices values for each analysed vegetation site Appendix D. Fuzzy c-means classification for interpretation of uncertainties for land-cover mapping Appendix E. Validation of land-cover maps Appendix F. K-means classification results Appendix G. Heterogeneity of natural landscapes and mixed pixels of satellite data Appendix H. Distribution of land-cover classes and their changes by study area 5 Recent above-ground biomass changes in central Chukotka (NE Siberia) combining field-sampling and remote sensing Abstract 1 Introduction 2 Materials and methods 2.1 Study region and field surveys 2.2 Above-ground biomass upscaling and change derivation 3 Results 3.1 Vegetation composition and above-ground biomass 3.2 Upscaling above-ground biomass using GAM 3.3 Change of above-ground biomass between 2000 and 2017 in the four focus areas 4 Discussion 4.1 Recent state of above-ground biomass at the field sites 4.2 Recent state of above-ground biomass upscaled for central Chukotka 4.3 Change in above-ground biomass within the investigated 15–16 years in central Chukotka 5 Conclusions Data availability statement Author contributions Competing interests Acknowledgements References Appendix A. Sampling and above-ground biomass (AGB) calculation protocol for field data 6 Future spatially explicit tree above-ground biomass trajectories revealed for a mountainous treeline ecotone using the individual-based model LAVESI Abstract 1 Introduction 2 Materials and methods 2.1 Study region 2.2 LAVESI model setup, parameterisation, and validation 2.2.4 LAVESI simulation setup for this study 2.2.5 Validation of the model’s performance 3 Results 3.1 Dynamics and spatial distribution changes of tree above-ground-biomass 3.2 Spatial and temporal validation of the contemporary larch AGB 4 Discussion 4.1 Future dynamics of tree AGB at a plot level 4.2 What are the future dynamics of tree AGB at the landscape level? 5 Conclusions Data availability Acknowledgements References Appendix B. Permutation tests for tree presence versus topographical parameters Appendix C. Landsat-based, field, and simulated estimations of larch above-ground biomass (AGB). 7 Synthesis 7.1 What changes in vegetation composition have happened from 2000 to 2017 in central Chukotka? 7.2 How have the above-ground biomass (AGB) distribution and rates changed from 2000 to 2017 in central Chukotka? 7.3 What are the spatial dynamics and rates of tree AGB change in the upcoming centuries in the northern tundra-taiga from 2020 to 3000 CE on the plot level and landscape level? References Acknowledgements
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    Call number: AWI G2-23-95434
    Type of Medium: Monograph available for loan
    Pages: X, 438 Seiten , Illustrationen
    ISBN: 9783946729303 , 978-3-946729-30-3
    ISSN: 0932-2205
    Series Statement: Excellence in Ecology 30
    Language: English
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  • 49
    Call number: AWI G5-24-95642
    In: Developments in paleoenvironmental research, 21
    In: Tracking environmental change using lake sediments, 6
    Description / Table of Contents: This book, entitled Tracking Environmental Change Using Lake Sediments: Volume 6 – Sedimentary DNA, provides an overview of the applications of sedimentary DNA-based approaches to paleolimnological studies. These approaches have shown considerable potential in providing information about the long-term changes of overall biodiversity in lakes and their watersheds in response to natural and anthropogenic changes, as well as tracking human migrations over the last thousands of years. Although the first studies investigating the preservation of these molecular proxies in sediments originate from the late-1990s, the number of scientific publications on this topic has increased greatly over the last five years. Alongside numerous ecological findings, several sedimentary DNA studies have been dedicated to understanding the reliability of this approach to reconstruct past ecosystem changes. Despite the major surge of interest, a comprehensive compilation of sedimentary DNA approaches and applications has yet to be attempted. The overall aim of this DPER volume is to fill this knowledge gap.
    Type of Medium: Monograph available for loan
    Pages: xxiii, 437 Seiten , Illustrationen
    ISBN: 9783031437991 , 978-3-031-43798-4 , 9783031437984
    Series Statement: Developments in paleoenvironmental research 21
    Language: English
    Note: Contents 1 Using Lake Sedimentary DNA to Reconstruct Biodiversity Changes / Eric Capo, Cécilia Barouillet, and John P. Smol 2 The Sources and Fates of Lake Sedimentary DNA / Charline Giguet-Covex, Stanislav Jelavić, Anthony Foucher, Marina A. Morlock, Susanna A. Wood, Femke Augustijns, Isabelle Domaizon, Ludovic Gielly, and Eric Capo 3 The Sedimentary Ancient DNA Workflow / Peter D. Heintzman, Kevin Nota, Alexandra Rouillard, Youri Lammers, Tyler J. Murchie, Linda Armbrecht, Sandra Garcés-Pastor, and Benjamin Vernot 4 Bacterial and Archaeal DNA from Lake Sediments / Aurèle Vuillemin, Marco J. L. Coolen, Jens Kallmeyer, Susanne Liebner, and Stefan Bertilsson 5 Cyanobacterial DNA from Lake Sediments / Marie-Eve Monchamp and Frances R. Pick 6 Protist DNA from Lake Sediments / Cécilia Barouillet, Isabelle Domaizon, and Eric Capo 7 Diatom DNA from Lake Sediments / Katharina Dulias, Laura S. Epp, and Kathleen R. Stoof-Leichsenring 8 Aquatic Vegetation DNA from Lake Sediments / Aloïs Revéret, Inger G. Alsos, and Peter D. Heintzman 9 Aquatic Animal DNA from Lake Sediments / Irene Gregory-Eaves, Marie-Eve Monchamp, and Zofia E. Taranu 10 Terrestrial Plant DNA from Lake Sediments / Sandra Garcés-Pastor, Kevin Nota, Dilli P. Rijal, Sisi Liu, Weihan Jia, Maria Leunda, Christoph Schwörer, Sarah E. Crump, Laura Parducci, and Inger G. Alsos 11 Terrestrial Fauna and Hominin DNA from Sedimentary Archives / Tyler J. Murchie, Charline Giguet-Covex, Peter D. Heintzman, Viviane Slon, and Yucheng Wang 12 An Overview of Biodiversity and Network Modeling Approaches: Applications to Sedimentary DNA Records / Zofia E. Taranu, Irene Gregory-Eaves, and Marie-Eve Monchamp 13 Perspectives and Future Developments Within Sedimentary DNA Research / Luke E. Holman, Yi Wang, Rikai Sawafuji, Laura S. Epp, Kristine Bohmann, and Mikkel Winther Pedersen Glossary, Acronyms and Abbreviations Index
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    Call number: AWI G3-22-94687
    Description / Table of Contents: Permafrost is warming globally, which leads to widespread permafrost thaw and impacts the surrounding landscapes, ecosystems and infrastructure. Especially ice-rich permafrost is vulnerable to rapid and abrupt thaw, resulting from the melting of excess ground ice. Local remote sensing studies have detected increasing rates of abrupt permafrost disturbances, such as thermokarst lake change and drainage, coastal erosion and RTS in the last two decades. All of which indicate an acceleration of permafrost degradation. In particular retrogressive thaw slumps (RTS) are abrupt disturbances that expand by up to several meters each year and impact local and regional topographic gradients, hydrological pathways, sediment and nutrient mobilisation into aquatic systems, and increased permafrost carbon mobilisation. The feedback between abrupt permafrost thaw and the carbon cycle is a crucial component of the Earth system and a relevant driver in global climate models. However, an assessment of RTS at high temporal resolution to determine the ...
    Type of Medium: Dissertations
    Pages: xxiv, 134 Seiten , Illustrationen, Diagramme, Karten
    Language: English
    Note: Dissertation, Universität Potsdam, 2021 , Table of Contents Abstract Zusammenfassung List of Figures List of Tables Abbreviations 1 Introduction 1.1 Scientific background and motivation 1.1.1 Permafrost and climate change 1.1.2 Permafrost thaw and disturbances 1.1.3 Abrupt permafrost disturbances 1.1.4 Remote sensing 1.1.5 Remote sensing of permafrost disturbances 1.2 Aims and objectives 1.3 Study area 1.4 General data and methods 1.4.1 Landsat and Sentinel-2 1.4.2 Google Earth Engine 1.5 Thesis structure 1.6 Overview of publications and authors’ contribution 1.6.1 Chapter 2 - Comparing Spectral Characteristics of Landsat-8 and Sentinel-2 Same-Day Data for Arctic-Boreal Regions 1.6.2 Chapter 3 - Mosaicking Landsat and Sentinel-2 Data to Enhance LandTrendr Time Series Analysis in Northern High Latitude Permafrost Regions 1.6.3 Chapter 4 - Remote Sensing Annual Dynamics of Rapid Permafrost Thaw Disturbances with LandTrendr 2 Comparing Spectral Characteristics of Landsat-8 and Sentinel-2 Same-Day Data for Arctic-Boreal Regions 2.1 Abstract 2.2 Introduction 2.3 Materials and Methods 2.3.1 Study Sites 2.3.2 Data 2.3.3 Data Processing 2.3.3.1 Filtering Image Collections 2.3.3.2 Creating L8, S2, and Site Masks 2.3.3.3 Preparing Sentinel-2 Surface Reflectance Images in SNAP 2.3.3.4 Applying Site Masks 2.3.4 Spectral Band Comparison and Adjustment 2.4 Results 2.4.1 Spectral Band Comparison 2.4.2 Spectral Band Adjustment 2.4.3 ES and HLS Spectral Band Adjustment 2.5 Discussion 2.6 Conclusions 2.7 Acknowledgements 2.8 Appendix Chapter 2 3 Mosaicking Landsat and Sentinel-2 Data to Enhance LandTrendr Time Series Analysis in Northern High Latitude Permafrost Regions 3.1 Abstract 3.2 Introduction 3.3 Materials and Methods 3.3.1 Study Sites 3.3.2 Data 3.3.3 Data Processing and Mosaicking Workflow 3.3.4 Data Availability Assessment 3.3.5 Mosaic Coverage and Quality Assessment 3.4 Results 3.4.1 Data Availability Assessment 3.4.2 Mosaic Coverage and Quality Assessment 3.5 Discussion 3.6 Conclusions 4 Remote Sensing Annual Dynamics of Rapid Permafrost Thaw Disturbances with LandTrendr 4.1 Abstract 4.2 Introduction 4.3 Study Area and Methods 4.3.1 Study area 4.3.2 General workflow and ground truth data 4.3.3 Data and LandTrendr 4.3.4 Index selection 4.3.5 Temporal Segmentation 4.3.6 Spectral Filtering 4.3.7 Spatial masking and filtering 4.3.8 Machine-learning object filter 4.4 Results 4.4.1 Focus sites 4.4.2 North Siberia 4.5 Discussion 4.5.1 Mapping of RTS 4.5.2 Spatio-temporal variability of RTS dynamics 4.5.3 LT-LS2 capabilities and limitations 4.6 Conclusion 4.7 Appendix 5 Synthesis and Discussion 5.1 Google Earth Engine 5.2 Landsat and Sentinel-2 5.3 Image mosaics and disturbance detection algorithm 5.4 Mapping RTS and their annual temporal dynamics 5.5 Limitations and technical considerations 5.6 Key findings 5.7 Outlook References Acknowledgements
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    Monograph available for loan
    Monograph available for loan
    Boca Raton : CRC Press
    Call number: AWI S2-23-95057
    Type of Medium: Monograph available for loan
    Pages: xvii, 593 Seiten , Illustrationen
    Edition: Second edition
    ISBN: 978-0-367-13991-9
    Series Statement: Texts in statistical science
    Language: English
    Note: Contents Preface to the Second Edition Preface Audience Teaching strategy How to use this book Installing the rethinking R package Acknowledgments Chapter 1. The Golem of Prague 1.1. Statistical golems 1.2. Statistical rethinking 1.3. Tools for golem engineering 1.4. Summary Chapter 2. Small Worlds and Large Worlds 2.1. The garden of forking data 2.2. Building a model 2.3. Components of the model 2.4. Making the model go 2.5. Summary 2.6. Practice Chapter 3. Sampling the Imaginary . . 3.1. Sampling from a grid-approximate posterior 3.2. Sampling to summarize 3.3. Sampling to simulate prediction 3.4. Summary 3.5. Practice Chapter 4. Geocentric Models 4.1. Why normal distributions are normal 4.2. A language for describing models 4.3. Gaussian model of height 4.4. Linear prediction 4.5. Curves from lines 4.6. Summary 4.7. Practice Chapter 5. The Many Variables & The Spurious Waffles 5.1. Spurious association 5.2. Masked relationship 5.3. Categorical variables 5.4. Summary 5.5. Practice Chapter 6. The Haunted DAG & The Causal Terror 6.1. Multicollinearity 6.2. Post-treatment bias 6.3. Collider bias 6.4. Confronting confounding 6.5. Summary 6.6. Practice Chapter 7. Ulysses' Compass 7.1. The problem with parameters 7.2. Entropy and accuracy 7.3. Golem taming: regularization 7.4. Predicting predictive accuracy 7.5. Model comparison 7.6. Summary 7.7. Practice Chapter 8. Conditional Manatees 8.1. Building an interaction 8.2. Symmetry of interactions 8.3. Continuous interactions 8.4. Summary 8.5. Practice Chapter 9. Markov Chain Monte Carlo 9.1. Good King Markov and his island kingdom 9.2. Metropolis algorithms 9.3. Hamiltonian Monte Carlo 9.4. Easy HMC: ulam 9.5. Care and feeding of your Markov chain 9.6. Summary 9.7. Practice Chapter 10. Big Entropy and the Generalized Linear Model 10.1. Maximum entropy 10.2. Generalized linear models 10.3. Maximum entropy priors 10.4. Summary Chapter 11. God Spiked the Integers 11.1. Binomial regression 11.2. Poisson regression 11.3. Multinomial and categorical models 11.4. Summary 11.5. Practice Chapter 12. Monsters and Mixtures 12.1. Over-dispersed counts 12.2. Zero-inflated outcomes 12.3. Ordered categorical outcomes 12.4. Ordered categorical predictors 12.5. Summary 12.6. Practice Chapter 13. Models With Memory 13.1. Example: Multilevel tadpoles 13.2. Varying effects and the underfitting/overfitting trade-off 13.3. More than one type of cluster 13.4. Divergent transitions and non-centered priors 13.5. Multilevel posterior predictions 13.6. Summary 13.7. Practice Chapter 14. Adventures in Covariance 14.1. Varying slopes by construction 14.2. Advanced varying slopes 14.3. Instruments and causal designs 14.4. Social relations as correlated varying effects 14.5. Continuous categories and the Gaussian process 14.6. Summary 14.7. Practice Chapter 15. Missing Data and Other Opportunities 15.1. Measurement error 15.2. Missing data 15.3. Categorical errors and discrete absences 15.4. Summary 15.5. Practice Chapter 16. Generalized Linear Madness 16.1. Geometric people 16.2. Hidden minds and observed behavior 16.3. Ordinary differential nut cracking 16.4. Population dynamics 16.5. Summary 16.6. Practice Chapter 17. Horoscopes Endnotes Bibliography Citation index Topic index
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  • 52
    Call number: AWI Bio-22-95014
    Description / Table of Contents: The deciduous needle tree larch (Larix Mill.) covers more than 80% of the Asian boreal forests. Only a few Larix species constitute the vast forests and these species differ markedly in their ecological traits, most importantly in their ability to grow on and stabilize underlying permafrost. The pronounced dominance of the summergreen larches makes the Asian boreal forests unique, as the rest of the northern hemisphere boreal forests is almost exclusively dominated by evergreen needle-leaf forests. Global warming is impacting the whole world but is especially pronounced in the arctic and boreal regions. Although adapted to extreme climatic conditions, larch forests are sensitive to varying climatic conditions. By their sheer size, changes in Asian larch forests as range shifts or changes in species composition and the resulting vegetation-climate feedbacks are of global relevance. It is however still uncertain if larch forests will persist under the ongoing warming climate or if they will be replaced by evergreen forests. It is therefore of great importance to understand how these ecosystems will react to future climate warmings and if they will maintain their dominance. One step in the better understanding of larch dynamics is to study how the vast dominant forests developed and why they only established in northern Asia. A second step is to study how the species reacted to past changes in the climate. The first objective of this thesis was to review and identify factors promoting Asian larch dominance. I achieved this by synthesizing and comparing reported larch occurrences and influencing components on the northern hemisphere continents in the present and in the past. The second objective was to find a possibility to directly study past Larix populations in Siberia and specifically their genetic variation, enabling the study of geographic movements. For this, I established chloroplast enrichment by hybridization capture from sedimentary ancient DNA (sedaDNA) isolated from lake sediment records. The third objective was to use the established method to track past larch populations, their glacial refugia during the Last Glacial Maximum (LGM) around 21,000 years before present (ka BP), and their post-glacial migration patterns. To study larch promoting factors, I compared the present state of larch species ranges, areas of dominance, their bioclimatic niches, and the distribution on different extents and thaw depths of permafrost. The species comparison showed that the bioclimatic niches greatly overlap between the American and Asian species and that it is only in the extremely continental climates in which only the Asian larch species can persist. I revealed that the area of dominance is strongly connected to permafrost extent but less linked to permafrost seasonal thaw depths. Comparisons of the paleorecord of larch between the continents suggest differences in the recolonization history. Outside of northern Asia and Alaska, glacial refugial populations of larch were confined to the southern regions and thus recolonization could only occur as migration from south to north. Alaskan larch populations could not establish wide-range dominant forest which could be related to their own genetically depletion as separated refugial population. In Asia, it is still unclear whether or not the northern refugial populations contributed and enhanced the postglacial colonization or whether they were replaced by populations invading from the south in the course of climate warming. Asian larch dominance is thus promoted partly by adaptions to extremely continental climates and by adaptations to grow on continuous permafrost but could be also connected to differences in glacial survival and recolonization history of Larix species. Except for extremely rare macrofossil findings of fossilized cones, traditional methods to study past vegetation are not able to distinguish between larch species or populations. Within the scope of this thesis, I therefore established a method to retrieve genetic information of past larch populations to distinguish between species. Using the Larix chloroplast genome as target, I successfully applied the method of DNA target enrichment by hybridization capture on sedaDNA samples from lake records and showed that it is able to distinguish between larch species. I then used the method on samples from lake records from across Siberia dating back up to 50 ka BP. The results allowed me to address the question of glacial survival and post-glacial recolonization mode in Siberian larch species. The analyzed pattern showed that LGM refugia were almost exclusively constituted by L. gmelinii, even in sites of current L. sibirica distribution. For included study sites, L. sibirica migrated into its extant northern distribution area only in the Holocene. Consequently, the post-glacial recolonization of L. sibirica was not enhanced by northern glacial refugia. In case of sites in extant distribution area of L. gmelinii, the absence of a genetic turn-over point to a continuous population rather than an invasion of southern refugia. The results suggest that climate has a strong influence on the distribution of Larix species and that species may also respond differently to future climate warming. Because species differ in their ecological characteristics, species distribution is also relevant with respect to further feedbacks between vegetation and climate. With this thesis, I give an overview of present and past larch occurrences and evaluate which factors promote their dominance. Furthermore, I provide the tools to study past Larix species and give first important insights into the glacial history of Larix populations.
    Type of Medium: Dissertations
    Pages: x, 121 Seiten , Illustrationen
    Language: English
    Note: Dissertation, Universität Potsdam, 2022 , Table of Contents Summary Deutsche Zusammenfassung Table of Contents 1 Introduction 1.1 Larix forests in a changing climate 1.2 The genus Larix 1.3 Larix distribution in the world and their dominance in northern Asia 1.4 Methods to study past species dynamics 1.4.1 Modern genetic marker studies 1.4.2 Lake sediments as archives of the past 1.4.3 Pollen and macrofossils 1.4.4 Metabarcoding of sedimentary ancient DNA 1.4.5 Metagenomic shotgun sequencing 1.4.6 Target enrichment by hybridization capture 1.5 Thesis Objectives 1.6 Thesis outline & author contributions 2 Manuscript I 2.1 Abstract 2.2 Introduction 2.3 Material and methods 2.3.1 Bioclimatic limits 2.3.2 Pollen, macrofossil, and DNA datasets 2.3.3 Ice sheets 2.4 Results 2.4.1 Bioclimatic limits of Larix and its distribution on permafrost 2.4.2 Glacial occurrence patterns of Larix 2.5 Discussion 2.5.1 Are differences in species bioclimatic limits responsible for disparity in Larix distribution across continents? 2.5.2 Do high latitude glacial refugia guarantee larch dominance? 2.5.3 What role does postglacial migration play in larch dominance? 2.5.4 Fire as an additional factor 2.5.5 Outlook 2.6 Conclusion 2.7 Acknowledgements 2.8 Author contributions 2.9 References 3 Manuscript II 3.1 Abstract 3.2 Introduction 3.3 Methods 3.3.1 Sample material 3.3.2 Laboratory work 3.3.3 Data analysis 3.4 Results 3.4.1 Overview of the shotgun and hybridization capture data sets 3.4.2 Ancient DNA authenticity 3.4.3 Retrieval of the Larix chloroplast genome 3.5 Discussion 3.5.1 Taxonomic classification—conservative approach results in low numbers of assignment 3.5.2 Target enrichment success—Larix reads increased by orders of magnitude along with other taxonomic groups 3.5.3 Complete retrieval of ancient Larix chloroplast genomes 3.5.4 Larix sibirica variants present over time 3.5.5 Larch forest decline over the last 7000 years 3.6 Conclusion 3.7 Acknowledgments 3.8 Author contributions 3.9 References 4 Manuscript III 4.1 Abstract 4.2 Introduction 4.3 Results & Discussion 4.3.1 Chloroplast and repetitive DNA enrichment in the sedaDNA samples 4.3.2 A wider pre-glacial distribution of L. sibirica 4.3.3 Larix gmelinii formed northern LGM refugia across Siberia 4.3.4 Postglacial colonization history - differences among larch species 4.3.5 Environment likely plays a more important role than biogeography 4.4 Conclusion 4.5 Material & methods 4.5.1 Sample material 4.5.2 Sequence data analysis 4.6 Data availability 4.7 Acknowledgments 4.8 Author contributions 4.9 References 5 Discussion and synthesis 5.1 Hybridization capture is a well-suited method to study ancient species dynamics 5.1.1 Advantages and limitations of shotgun sequencing 5.1.2 Successful hybridization capture enrichment using chloroplast DNA 5.1.3 Challenges in single-copy target enrichment 5.1.4 Limitations and potentials to improve sedaDNA capture studies 5.2 Factors promoting Asian larch dominance 5.3 Drivers of Larix species distribution 5.3.1 Implications for larch forests under climate warming 5.4 Conclusion 5.5 Outlook 6 References 7 Appendix 7.1 Appendix to manuscript I 7.2 Appendix to manuscript II 7.3 Appendix to manuscript III 7.3.1 Material and Methods 7.3.2 Additional Results & Discussions 7.3.3 References Acknowledgements Eidesstattliche Erklärung
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    Call number: AWI G9-84-0295 ; AWI G9-84-0295(2. Ex.)
    Type of Medium: Monograph available for loan
    Pages: XXII, 697 Seiten , Illustrationen , 25,5 cm
    ISBN: 0858471175
    Language: English
    Note: CONTENTS: Preface. - Acknowledgements. - Sir Douglas Mawson. - Symposium Opening Ceremony. - The Mawson Lecture. - Symposium Topics. - 1. Precambrian East Antarctic Craton. - 2. East Antarctica-West Antarctica Boundary and the Ross Orogen, including Northern Victoria Land. - 3. Beacon Supergroup and Associated Igneous Rocks. - 4. West Antarctica. - 5. Scotia Arc and Antarctic Peninsula. - 6. Marine Geology. - 7. Antarctic Resources. - 8. Glacial Geology and Geomorphology. - 9. Crusta! Structure of Antarctica. - 10. Cenozoic Tectonics and Climatic Record-Onshore and Offshore Evidence. - 11. Antarctica in Gondwanaland. - 12. Plate Tectonics. - 13. Antarctic Meteorites. - 14. Subantarctic Islands. - 15. Cenozoic Igneous Activity. - I. Precambrian East Antarctic Craton. - The Precambrian Geological Evolution of the East Antarctic Metamorphic Shield: a Review / P.R. James and R.J. Tingey. - Geological History of the Archaean Napier Complex of Enderby Land / L.P. Black and P.R. James. - The Geology of the Fyfe Hills-Khmara Bay Region, Enderby Land / M.A. Sandiford and C.J.L. Wilson. - The Napier and Rayner Complexes of Enderby Land, Antarctica: Contrasting Styles of Metamorphism and Tectonism / D.J. Ellis. - Regional Geobarometry-Geothermometry and Metamorphic Evolution of Enderby Land, Antarctica / S.L. Harley. - Sm-Nd Isotopic Systematics of Enderby Land Granulites. Evidence for the Redistribution of Sm and Nd During Metamorphism (Abstract) / M. T. McCulloch and L.P. Black. - Geology and Petrology of Prince Olav Coast, East Antarctica / Y. Hiroi, K. Shiraishi, Y. Nakai, T. Kano and S. Yoshikura. - Tectonic Situation of Lützow-Holm Bay in East Antarctica and its significance in Gondwanaland / M. Yoshida and K. Kizaki. - Sapphirine-Garnet and Associated Parageneses in Antarctica / E.S. Grew. - A Review of the Tectonic and Metamorphic History of the Lützow-Holm Bay Region, East Antarctica / M. Yoshida, M. Suzuki, H. Shirahata, H. Kojima and K. Kizaki. - Spinels in Calc-silicate Rocks from the coast of Lützow-Holm Bay and surrounding areas (Abstract) / H. Matsueda, Y. Matsumoto and Y. Motoyoshi. - Petrochemical Study of Metamorphic Rocks in the Lützow-Holm Bay Area, East Antarctica (Abstract) / S. Kanisawa and K. Yanai. - Geology and Petrology of the Yamato Mountains / K. Shiraishi, M. Asami and Y. Ohta. - Geology and Petrology of the Belgica Mountains (Abstract) / H. Kojima, K. Yanai and T. Nishida. - Lead Isotopic Composition in Metamorphic Rocks from Skarvsnes, East Antarctica / H. Shirahata. - Sr-Isotopic Studies of some Intrusive Rocks in the Ahlmann Ridge and Annandagstoppane, Western Queen Maud Land, Antarctica / J.M. Barton Jr. and Y.E. Copperthwaite. - Preliminary Report on the Geochemistry and Petrology of some Igneous Rocks in the Ahlmanryggen and Giaeverryggen, Western Dronning Maud Land, Antarctica (Abstract) / J.R. Krynauw. - Petrology and Zircon Geochronology of Herring Island and Commonwealth Bay and Evidence for Gondwana Reconstruction / R.L. Oliver, J.A. Cooper and A .F. Truelove. - Manganese-Rich Chemical Sediments from Wilkes Land, Antarctica / l.R. Plimer and J.R Lovering. - A Reassessment of the Age of the Windmill Metamorphics, Casey Area / l.S. Williams, W. Compston, K.D. Collerson, P.A. Arriens and J.R Lovering. - Lithological and Sr-Nd Isotopic Relationships in the Vestfold Block: Implications for Archaean and Proterozoic Crustal Evolution in the East Antarctic / K.D. Collerson, E. Reid, D. Millar and M. T. McCulloch. - Structure, Fabric Development and Metamorphism in Archaean Gneisses of the Vestfold Hills, East Antarctica / A.J. Parker, P.R. James, R.L. Oliver and V. Mielnik. - 2. East Antarctica-West Antarctica Boundary and the Ross Orogen, including Northern Victoria Land. - A Review of the Ross Fold Belt of the Transantarctic Mountains as a Boundary Structure between East Antarctica and West Antarctica (Abstract) / G.E. Grikurov. - The East Antarctica-West Antarctica Boundary between the Ice Shelves: a Review / C. Craddock. - The Pre-Beacon Geology of Northern Victoria Land: a Review / J.D. Bradshaw and M. G. Laird. - The Sedimentology of the Robertson Bay Group, Northern Victoria Land / B. D. Field and R.H. Findlay. - Tectonic Significance of Deformations affecting the Robertson Bay Group and Associated Rocks, Northern Victoria Land, Antarctica / R.H. Findlay and B.D. Field. - Geology of the Daniels Range, Northern Victoria Land, Antarctica: a Preliminary Report / C. C. Plummer, R.S. Babcock, J. W. Sheraton, C.J.D. Adams and R.L. Oliver. - Geology of the Daniels Range Intrusive Complex Northern Victoria Land, Antarctica (Abstract) / R.S. Babcock, C.C. Plummer, J.S. Sheraton, C.J. Adams, R.L. Oliver. - Trends in Regional Metamorphism and Deformation in Northern Victoria Land, Antarctica / G. Kleinschmidt. - New Data on the Lower Palaeozoic Bowers Supergroup, Northern Victoria Land / M. G. Laird and J.D. Bradshaw. - Geosynclinal Sedimentation and Ross Orogeny in Northern Victoria Land (Abstract) / R. Tessensohn. - Age and Correlation of the Cambrian-Ordovician Bowers Supergroup, Northern Victoria Land / R.A. Cooper, J.B. Jago, A.J. Rowell and P. Braddock. - Post-Mindyallan Late Cambrian Trilobite Faunas from Antarctica (Abstract) / J.H. Shergold. - Post-Ross Orogeny Cratonisation of Northern Victoria Land / G. W. Grindley and P.J. Oliver. - Geochemistry, Petrography and Geochronology of the Cambro-Ordovician and Devonian-Carboniferous Granitoids of Northern Victoria Land, Antarctica / U. Vetter, N. W. Roland, H. Kreuzer, A. Hohndorf, H. Lenz and C. Besang. - Chemistry of Palaeozoic Granites of Northern Victoria Land (Abstract) / D. Wyborn. - Chemical Control on Stratigraphic Relations in Northern Victoria Land and Some Possible Relations with SE Australia (Abstract) / D. Wyborn. - Results of Palaeomagnetic Investigations in Northern Victoria Land, Antarctica / G. Delisle. - The Geology of Terra Nova Bay / D.N.B. Skinner. - The Petrology and Origin of Orbicular Tonalite from Western Taylor Valley, Southern Victoria Land, Antarctica / P.S. Dahl and D.R Palmer. - The Granites and Two Orogenies of Southern Victoria Land / D.N.B. Skinner. - A Re-interpretation of the Basement Granites, McMurdo Sound, Antarctica (Abstract) / R.H. Findlay. - Petrology and Geochemistry of the Queen Maud Batholith, Central Transantarctic Mountains, with Implications for the Ross Orogeny / S.G. Borg. - Type Locality of the Ackerman Formation, La Gorce Mountains, Antarctica / E. Stump. - The Structural Development of Selected Areas in the Pensacola Mountains (Abstract) / A. Frischbutter, W. Weber, J. Hojmann and H.J. Paech. - A Gcochronological Investigation of the Shackleton Range / R.J. Pankhurst, P.D. Marsh, P.D. Clarkson. - Tectonics and Relationships between Structural Stages in the Precambrian of the Shackleton Range, Western Margin of the East Antarctic Craton / J. Hojmann and H.J. Paech. - The Late Precambrian and Early Palaeozoic History of The Shackleton Range, Coats Land / P.D. Marsh. - Structure and Outline of Geologic History of the Southern Weddell Sea Basin / E.N. Kamenev and V.L. Ivanov. - Magnetic Studies of Upper Crusta! Structure in West Antarctica and the Boundary with East Antarctica / E.J. Jankowski, D.J. Drewry and J.C. Behrendt. - Crust and Upper Mantle Study of McMurdo Sound / L.D. McGinnis, D.D. Wilson, W.J. Burdelik and T.H. Larson. - 3. Beacon Supergroup and Associated Igneous Rocks. - The Beacon Supergroup of Northern Victoria Land, Antarctica / B.C. Walker. - Trace Fossils of the Permian-Triassic Takrouna Formation, Northern Victoria Land, Antarctica / J.M. Zawiskie, J. W. Collinson and W.R. Hammer. - Permian-Triassic Sedimentary Sequence in Northern Victoria Land, Antarctica / J. W. Collinson and N.R. Kemp. - Late Palaeozoic Glacigene Strata in Northern Victoria Land (Abstract) / B. C. McKelvey and B.C. Walker. - Deposition of the Weller Coal M
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  • 54
    Call number: ZSP-168-9
    In: Berichte zur Polarforschung
    Type of Medium: Series available for loan
    Pages: 36 S. : Kt.
    Series Statement: Berichte zur Polarforschung 9
    Language: English
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  • 55
    Call number: AWI G3-99-0351
    Type of Medium: Monograph available for loan
    Pages: XIV, 489 Seiten , Illustrationen
    ISBN: 0-12-355860-3
    Series Statement: Burg Wartenstein symposium 81
    Language: English
    Note: Contents: Contributors. - Preface. - Acknowledgements. - Paleogeography. - Ancient vegetation - the fossil record. - The Steppe-Tundra concept and its application in Beringia. - Paleoclimate. - Primary production and the Pleistocene ungulates - the productivity paradox. - Man in ancient Beringia. - Paleoecology of Beringia - a synthesis. - References. - General index. - Index to faunal and floral taxa.
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  • 56
    Call number: AWI E3-92-0497
    Type of Medium: Monograph available for loan
    Pages: XV, VII, 333 S. , Ill., graph. Darst., Kt.
    Edition: Repr. [of the ed.] London, 1901
    ISBN: 0905838416
    Language: English
    Note: Contents: Preface. - New introduction. - I. Introductory. - II. From Hobart to South Victoria Land. - III. Life in South Victoria Land. - IV. Cut off from all the world. - V. The winter in Victoria Land. - VI. Sledge Journey in winter. - VII. Among the penguins. - VIII. Return of the Southern Cross. - IX. Farthest south. - X. Towards civilization. - Appendix I. Appendix II.
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  • 57
    Call number: AWI A5-96-0611
    In: Environmental fluid mechanics
    Type of Medium: Monograph available for loan
    Pages: 299 Seiten , Illustrationen
    Edition: 1st edition 1982, reprinted 1984
    ISBN: 9027712476
    Series Statement: Environmental fluid mechanics 1
    Language: English
    Note: Table of Contents: FOREWORD. - CHAPTER 1. INTRODUCTION. - 1.1. Definitions. - 1.2. Practical Scope. - a. The Water Budget. - b. The Energy Budget. - 1.3. Global Climatology. - 1.4. The Transfer of Other Admixtures at the Earth-Atmosphere Interface. - CHAPTER 2. HISTORY OF THE THEORIES OF EVAPORATION - A CHRONOLOGICAL SKETCH. - 2.1. Greek Antiquity. - 2.2. The Roman Period and the Middle Ages. - 2.3. The Seventeenth and Eighteenth Centuries: Initial Measurements and Experimentation. - 2.4. Foundations of Present Theories in the Nineteenth Century. - CHAPTER 3. THE LOWER ATMOSPHERE. - 3.1. Moist Air. - a. Some Parameter Definitions. - b. Useful Forms of the First Law of Thermodynamics. - c. Saturation Vapor Pressure. - 3.2. Hydrostatic Stability of Partly Saturated Atmosphere. - a. Small Adiabatic Displacements. - b. Potential Temperature. - 3.3. Atmospheric Transport of Water Vapor. - a. Conservation of Water Vapor. - b. Other Conservation Equations. - c. Solution of the Transport Equations . - 3.4. The Atmospheric Boundary Layer. - CHAPTER 4. MEAN PROFILES AND SIMILARITY IN A STATIONARY AND HORIZONTALLY UNIFORM ABL. - 4.1. The Dynamic Sublayer. - a. The Logarithmic Profile. - b. The Power Law Approximation. - 4.2. The Surface Sublayer. - a. The Mean Profiles. - b. Some Flux-Profile Functions. - 4.3. Bulk Parameterization of the Whole ABL. - a. Similarity for the Mean Profiles in the Outer Sublayer. - b. Bulk Transfer Equations for the ABL. - 4.4. The Interfacial Sublayers. - a. Similarity for the Mean Profiles. - b. Interfacial Bulk Transfer Equations for Scalar Admixtures. - c. Smooth Surfaces: The Viscous Sublayer. - d. Surfaces with Bluff Roughness Elements. - e. Surfaces with Permeable Roughnesses: The Canopy Sublayer. - CHAPTER 5. THE SURFACE ROUGHNESS PARAMETERIZATION. - 5.1. The Momentum Roughness. - a. Land Surfaces. - b. Water Surfaces. - 5.2. The Scalar Roughness. - a. Calculation from Interfacial Transfer Coefficients. - b. Values Over Water. - CHAPTER 6. ENERGY FLUXES AT THE EARTH'S SURFACE. - 6.1. Net Radiation. - a. Global Short Wave Radiation. - b. Albedo. - c. Long-Wave or Terrestrial Radiation. - 6.2. Energy Absorption by Photosynthesis. - 6.3. Energy Flux at Lower Boundary of the Layer. - a. Land Surfaces. - b. Whole Water Bodies. - c. Water Surfaces. - 6.4. Remaining Terms. - a. Energy Advection. - b. Rate of Change of Energy Stored in the Layer. - CHAPTER 7. ADVECTION EFFECTS NEAR CHANGES IN SURFACE CONDITIONS. - 7.1. The Internal Boundary Layer. - a. Equations for the Mean Field. - b. Methods of Closure for Disturbed Boundary Layers: A Brief Survey. - c. Some General Features of Local Momentum Advection. Fetch Requirement. - 7.2. Evaporation with Local Advection. - a. Analytical Solutions with Power Laws. - b. Numerical Studies. - CHAPTER 8. METHODS BASED ON TURBULENCE MEASUREMENTS. - 8.1. Direct or Eddy-Correlation Method. - a. Instruments. - b. Requirements on Instrumentation. - 8.2. The Dissipation Method. - a. The Direct Variance Dissipation Method. - b. The Inertial Dissipation (or Spectral Density) Method. - CHAPTER 9. METHODS BASED ON MEASUREMENTS OF MEAN PROFILES. - 9.1. Mean Profile Method With Similarity Formulations. - a. Measurements in the Surface Sublayer. - b. Measurements in the Dynamic Sublayer. - c. Upper-Air Measurements: The ABL Profile Method. - 9.2. Bulk Transfer Approach. - a. Over a Uniform Surface. - b. Evaporation From Lakes. - 9.3. Sampling Times. - CHAPTER 10. ENERGY BUDGET AND RELATED METHODS. - 10.1. Standard Application. - a. With Bowen Ratio (EBBR). - b. With Profiles of Mean Wind and of One Scalar (EBWSP). - 10.2. Simplified Methods for Wet Surfaces. - a. Some Comments on Potential Evaporation. - b. The EBWSP Method With Measurements at One Level. - c. Advection-Free Evaporation from Wet Surfaces. - 10.3. Simplified Methods for Actual Evapotranspiration. - a. Adjustment of Penman's Approach With Bulk Stomatal Resistance. - b. Complementary Relationships between Actual and Potential Evaporation. - c. Extensions of Equilibrium Evaporation Concept. - CHAPTER 11. MASS BUDGET METHODS. - 11.1 Terrestrial Water Budget a. Soil Water Depletion and Seepage. - b. River Basins and Other Hydrological Catchments. - c. Lakes and Open-water Reservoirs. - d. Water Budget-Related Instruments; Evaporimeters. - 11.2. Atmospheric Water Budget a. Concept and Formulation b. Application of the Method . - HISTORICAL REFERENCES (PRIOR TO 1900). - REFERENCES. - INDEX.
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  • 58
    Series available for loan
    Series available for loan
    Bremerhaven : Alfred-Wegener-Inst. für Polar- und Meeresforschung
    Associated volumes
    Call number: ZSP-168-5
    In: Berichte zur Polarforschung
    Type of Medium: Series available for loan
    Pages: 39 S. : graph. Darst.
    Series Statement: Berichte zur Polarforschung 5
    Language: English
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  • 59
    Call number: AWI Bio-99-0205-2 ; AWI Bio-99-0205-1
    In: Atlas of seeds and small fruits of Northwest-European plant species 〈Sweden, Norway, Denmark, East Fennoscandia and Iceland〉
    Type of Medium: Monograph available for loan
    Pages: 259 S. , Ill.
    ISBN: 9172604980
    Language: English
    Note: Contents: Introduction. - Information concerning the Taxonomic Arrangement and the Material Examined. - Notes on Keys and Descriptions. - Glossary. - List of Abbreviations. - Salicaceae. - Myricaceae. - Corylaceae. - Betulaceae. - Fagaceae. - Ulmaceae. - Cannabaceae. - Urticaceae. - Santalaceae. - Loranthaceae. - Polygonaceae. - Chenopodioneae. - Amaranthaceae. - Portulacaceae. - Caryophyllaceace. - Nymphaeaceae. - Ceratophyllaceae. - Ranunculaceae. - Paeoniaceae. - Berberidaceae. - Aristolochiaceae. - Papaveraceae. - Cruciferae. - References. - Index of Taxa. - Plates. - Simple Symmetrical Plane Shapes.
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  • 60
    Call number: AWI A7-92-0314
    Type of Medium: Monograph available for loan
    Pages: IX, 560 S. , graph. Darst., Kt.
    Edition: 1st publ.
    ISBN: 0521252229
    Language: English
    Note: CONTENTS: Foreword. - Introduction. - SESSION I - ATMOSPHERIC GENERAL CIRCULATION MODELS AND CLIMATE SIMULATIONS. - Large-scale climate modelling and small-scale physical processes / J. Smagorinsky. - Simulation of climate by general circulation models with hydrologic cycles / S. Manabe. - Current parameterizations of land-surface processes in atmospheric general circulation models / D. J. Carson. - The sensitivity of numerically simulated climates to land surface conditions / Y. Mintz. - SESSION II - THE MICROPHYSICAL PROCESSES OF MOMENTUM, HEAT AND WATER TRANSFERS ACROSS AND NEAR THE SURFACE OF THE LAND. - Vertical flux of moisture and heat at a bare soil surface / W. H. Brutsaert. - The vertical fluxes of heat and moisture at a vegetated land surface / L. J. Fritschen. - Vertical flux of heat and moisture in snow and ice / M. Kuhn. - SESSION III - MESOSCALE PARAMETERIZATIONS OF THE TRANSFER PROCESSES. - Parameterization of hydrologic processes / J. C. I. Dooge. - Dynamic hydro-thermal balances at macroscale / P. S. Eagleson. - SESSION IV - LAND SURFACE GLOBAL DATA SETS. - Use of regional and global soils data for climate modelling/ M. J. Gardiner. - Land surface processes: Vegetation / A. Perrier. - Data on snow cover and glaciers for the global climatic models / V. M. Kotliakov and A. N. Krenke. - The shortwave albedo and the surface emissivity / K. Ya. Kondratyev, V. I. Korzov, V. V. Mukhenberg and L. N. Dyachenko. - Water balance / A. Baumgartner. - SESSION V - ACQUISITION OF LAND SURFACE DATA. - Possibilities for remote sensing of surface characteristics / K. I. Itten.
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  • 61
    Call number: AWI G2-93-0199
    Description / Table of Contents: The essays in this volume cover: the materials which may be recognizably preserved for varying periods of time or whose presence in certain deposits may be inferred from characteristic products of their diagenesis; how and to what extent these materials or diagenetic products may be used to reconstruct the flora of a lake basin, its catchment area or regions further away; the reliability or fallibility of chemical, physical or biological methods of analysis, where materials come from, to what extent they are homogeneously or heterogeneously deposited after arrival in a lake basin and whether the latter situation arises ab initio or is the result of later perturbations; the various direct or indirect methods of dating deposits, even on a global scale, and stress, strain and stability in lacustrine environments. Some chapters are devoted to reconstruction of the past during certain periods of time in given localities but in all the chapters the matters considered and views expressed are related to previous work done in various parts of the world. The book will be of value to all concerned with the past and present environment, botany, ecology, hydrology, and geography. The reference sections provide a comprehensive bibliography of palaeolimnological and related literature.
    Type of Medium: Monograph available for loan
    Pages: XVIII, 411 S. : Ill., graph. Darst., Kt.
    ISBN: 0816613648
    Language: English
    Note: Table of Contents: Winifred Tutin - a personal note / John W. G. Lund. - 1 Chemical stratigraphy of lake sediments as a record of environmental change / D. R. Engstrom and H. E. Wright. - 2 Organic geochemistry of lacustrine sediments: triterpenoids of higher-plant origin reflecting post-glacial vegetational succession / P. A. Cranwell. - 3 Empirical testing of 210Pb-dating models for lake sediments / F. Oldfield. - 4 The transfer of natural and artificial radionuclides to Brotherswater from its catchment / J. D. Eakins ... - 5 A global review of palaeomagnetic results from wet lake sediments / R. Thompson. - 6 Stratigraphic changes in algal remains (diatoms and chrysophytes) in the recent sediments of Blelham Tarn, English Lake District / Elizabeth Y. Haworth. - 7 The preservation of algal remains in recent lake sediments / David Livingstone. - 8 Stress, strain, and stability of lacustrine ecosystems / Edward S. Deevey, Jr. - 9 Pollen recruitment to the sediments of an enclosed lake in Shropshire, England / Anne P. Bonny and Peter V. Allen. - 10 Sediment focusing and pollen influx / Margaret Bryan Davis ... - 11 Stages in soil development reconstructed by evidence from hypha fragments, pollen and humus contents in soil profiles / Svend T. Andersen. - 12 Pollen diagrams from Cross Fell and their implication for former tree-lines / Judith Turner. - 13 The Holocene vegetation of the Burren, western Ireland / W. A. Watts. - 14 Late-Quaternary pollen and plant macrofossil stratigraphy at Lochan an Druim, north-west Scotland / Hilary H. Birks. - Index.
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  • 62
    Series available for loan
    Series available for loan
    Bremerhaven : Alfred-Wegener-Inst. für Polar- und Meeresforschung
    Associated volumes
    Call number: ZSP-168-16
    In: Berichte zur Polarforschung
    Type of Medium: Series available for loan
    Pages: 53 S. : graph. Darst., Kt.
    Series Statement: Berichte zur Polarforschung 16
    Language: English
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  • 63
    Call number: ZSP-168-15
    In: Berichte zur Polarforschung
    Type of Medium: Series available for loan
    Pages: 59 S. : Kt.
    Series Statement: Berichte zur Polarforschung 15
    Language: English
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  • 64
    Call number: AWI P8-89-0293
    In: Heidelberger geographische Arbeiten, Heft 69
    Type of Medium: Monograph available for loan
    Pages: 573 Seiten , Illustrationen , 2 Kartenbeilagen , 24 cm
    ISBN: 3885700697
    Series Statement: Heidelberger geographische Arbeiten 69
    Language: German , English
    Note: Inhaltsverzeichnis: Vorwort. - 1. Zielsetzung und Ablauf der Heidelberg-Ellesmere Island-Expedition 1978 / D. Barsch und L. King. - 2. Das Borup-Fjord-Gebiet in N-Ellesmere Island, N. W. T., Kanada: Entdeckung und Begehung des Gebietes, vorhandene Karten und offizielle Namen / L. King. - 3. Geodätische und photogrammetrische Arbeiten an der Oobloyah Bay, N-Ellesmere Island, N.W.T., Kanada, im Rahmen der "Heidelberg-Ellesmere-Island-Expedition 1978" / G. Hell. - 4. Geologie, Tektonik und strukturelle Verzeichnung der geomorphologischen Großformen im Expeditionsgebiet Oobloyah Bay - Neil Peninsula, N-Ellesmere Island, N.W.T., Kanada / H. R. Völk. - 5. Witterungsverlauf im Oobloyah-Tal, N-Ellesmere Island, N.W.T., Kanada, vom 24. Juni bis zum 4. August 1978, ein statistischer Wertevergleich / W. A. Flügel. - 6. Das Sommerklima von N-Ellesmere Island, N.W.T., Kanada - eine Beurteilung von Stationswerten unter besonderer Berücksichtigung des Sommers 1978 / L. King. - 7. Zur Geomorphologie des Expeditionsgebietes Oobloyah Bay, N-Ellesmere Island, N.W.T., Kanada / D. Barsch. - 8. Studien zur gegenwärtigen Geomorphodynamik im Bereich der Oobloyah Bay, N-Ellesmere Island, N.W.T., Kanada / D. Barsch. - 9. Terassen, Flußarbeit und das Modell der exzessiven Talbildungszone im Expeditionsgebiet Oobloyah Bay, N-Ellesmere Island, N.W.T., Kanada / D. Barsch. - 10. Die Gletscher im Einzugsgebiet des Borup-Fjord, N-Ellesmere Island, N.W.T., Kanada / L. King. - 11. Gletschergeschichtliche Arbeiten im Gebiet zwischen Oobloyah Bay und Esayoo Bay, N-Ellesmere Island, N.W.T., Kanada / L. King. - 12. Glaziologische Beobachtungen an der Stirn des Weber-Gletschers, Borup-Fjord-Gebiet, N-Ellesmere Island, N.W.T., Kanada / D. Barsch, L. King und R. Mäusbacher. - 13. Jungquartäre Delta- und Flußentwicklung im glazialisostatischen Hebungsraum der Oobloyah Bay auf N-Ellesmere Island, N.W.T., Kanada / H. R. Völk. - 14. Hydrologische Studien zum Wasserhaushalt hocharktischer Einzugsgebiete im Bereich des Oobloyah-Tals, N-Ellesmere Island, N.W.T., Kanada / W. A. Flügel. - 15. Hydrochemische Untersuchungen von Niederschlägen, Bodenwasser, Seen und Flüssen im Oobloyah-Tal, N-Ellesmere Island, N.W.T., Kanada / W. A. Flügel. - 16. Geomorphologische Kartierung im Oobloyah-Tal, N-Ellesmere Island, N.W.T., Kanada / R. Mäusbacher. - 17. Gesteinstemperaturen und Insolationsverwitterung im hocharktischen Bereich, Oobloyah Bay, N-Ellesmere Island, N.W.T., Kanada / H. Eichler. - 18. Kleinformen der hocharktischen Verwitterung im Bereich der Oobloyah Bay, N-Ellesmere Island, N.W.T., Kanada - Formengenese und Prozesse / H. Eichler. - 19. Oberflächennahe Bodentemperaturmessungen in Oobloyah Bay, N-Ellesmere Island, N.W.T., Kanada / R. Mäusbacher. - 20. Recent iron ore deposition and heavy metal accumulation in Access Lake, Oobloyah Valley, northern Ellesmere Island, N.W.T., Canada / D. Barsch und G. Müller. - 21. Die Meereisentwicklung im Inneren des östlichen kanadischen Arktisarchipels und ihre Bedeutung für die Arbeiten der Heidelberg-Ellesmere Island-Expedition an der Oobloyah Bay, N-Ellesmere Island, N.W.T., Kanada / L. King. - 22. Gefäßpflanzen von Oobloyah Bay, N-Ellesmere Island, N.W.T., Kanada; eine kommentierte Pflanzenliste und phänologische Beobachtungen / R. Mäusbacher. - 23. The mosses of peat mounds, Oobloyah Bay, northern Ellesmere Island, N.W.T., Canada / L. King. - 24. Beobachtungen zu organischen Kleinformen im Oobloyah Tal, N-Ellesmere Island, N.W.T., Kanada / W. A. Flügel und R. Mäusbacher. - 25. Faunal notes of the Heidelberg Ellesmere Island Expedition 1978, Oobloyah Bay, northern Ellesmere Island, N.W.T., Canada / D. Barsch und L. King. - Anlage 1: Orthophotokarte 〈1 : 25 000〉 Oobloyah Bay. - Anlage 2: Geomorphologische Karte 〈1 : 25 000〉 Oobloyah Bay. - Anlage 3: Radiocarbondaten. - Anlage 4: Planung, Einkauf und Lagerung der Nahrungsmittel. , Beiträge teilweise in deutsch, teilweise in englisch
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  • 65
    Call number: AWI A6-92-0306 ; MOP 46247 / Mitte
    Type of Medium: Monograph available for loan
    Pages: XVII, 477 Seiten , Illustrationen
    Edition: second editon
    ISBN: 0471059714
    Language: English
    Note: Contents: Abbreviations. - Partial List of Symbols. - 1 THE GOVERNING EQUATIONS. - 1-1 Introduction. - 1-2 Equation of Motion. - 1-3 Continuity Equation. - 1-4. - Equation of State. - 1-5 First Law of Thermodynamics. - 1-6 The Complete System of Equations. - 1-7 Coordinate Systems. - 1-8 Map Projections. - 1-8-1 Polar Stereographic Projection. - 1-8-2 Mercator Projection. - 1-8-3 Lambert Conformal Projection. - 1-8-4 Additional Remarks. - 1-9 Alternate Vertical Coordinates. - 1-9-1 Pressure Vertical Coordinate. - 1-9-2 Isentropic Vertical Coordinate Θ. - 1-10 Some Energy Relations. - 1-10-1 Kinetic Energy. - 1-10-2 Potential Energy. - 1-11 Available Potential Energy. - 1-12 Vorticity and Divergence Equations. - 1-12-1 Divergence Equations. - 2 WAVE MOTION IN THE ATMOSPHERE: PART 1. - 2-1 Introduction. - 2-2 Linearized Equations. - 2-3 Pure Sound Waves. - 2-4 Sound Waves and Internal Gravity Waves. - 2-5 Surface Gravity Waves. - 2-6 Inertial Gravity Waves and Rossby Waves. - 2-7 Response to Initial Conditions. - 2-8 Geostrophic Adiustment. - 3 SCALE ANALYSIS. - 3-1 Introduction. - 3-2 Shallow-Water Equations. - 3-3 Baroclinic Equations. - 3-4 Midlatitude Analysis. - 3-5 Tropics. - 3-6 Planetary Scale. - 3-7 Balance System. - 4 ATMOSPHERIC WAVES: PART. - 4-1 Introduction. - 4-2 Rossby Waves. - 4-3 Conditions for Barotropic Instability. - 4-4 Some Unstable Profiles. - 4-5 Linear Shear. - 4-6 Barotropic Effects in the Atmosphere. - 4-7 Baroclinic Instability. - 4-8 Baroclinic Instability with Linear Shear. - 4-9 Two-Level Model. - 4-10 Wave Structure. - 4-11 Vertical Energy Propagation. - 4-12 Barotropic Equatorial Waves. - 4-13 Vertical Structure of Equatorial Waves. - 5 NUMERICAL METHODS. - 5-1 Introduction. - 5-2 Finite Difference Methods. - 5-3 The Advection Equation. - 5-4 Some Basic Concepts. - 5-5 Stability Analysis. - 5-5-1 The Matrix Method. - 5-5-2 Von Neumann Method. - 5-5-3 The Energy Method. - 5-6 Examples of the Von Neumann Method. - 5-6-1 Euler Scheme. - 5-6-2 Uncentered Differencing, Von Neumann Method. - 5-6-3 Trapezoidal Implicit Scheme. - 5-6-4 Euler Backward Scheme. - 5-6-5 Fourth-Order Space Differencing. - 5-6-6 Oscillation Equation. - 5-6-7 Two-Dimensional Advection Equation. - 5-6-8 External Gravity Waves, Leapfrog Scheme. - 5-6-9 Staggered Grid. - 5-7 Forward-Backward Scheme, Pressure Averaging, and Semi-Implicit Methods. - 5-7-1 Forward-Backward Scheme. - 5-7-2 Pressure Averaging. - 5-7-3 Time Averaging. - 5-7-4 Semi-Implicit Method. - 5-7-5 Lax Wendroff Scheme. - 5-8 A Summary of Some Difference Schemes. - 5-9 Parabolic Equations. - 5-10 Elliptic Equations. - 5-10-1 Relaxation Method. - 5-10-2 Direct Methods. - 5-10-3 Gaussian Elimination. - 5-10-4 Buneman Variant. - 5-10-5 Helmholtz Equation on a Sphere. - 5-10-6 Reduction of a Three-Dimensional Elliptic Equation to Two-Dimensional Equations. - 5-11 Nonlinear Instability and Aliasing. - 5-11-1 Discrete Mesh. - 5-11-2 Primitive Equations Considerations. - 6 GALERKIN METHODS. - 6-1 Introduction. - 6-2 Example with Spectral and Finite Element Methods. - 6-3 Time Dependence. - 6-4 Barotropic Vorticity Equation with Fourier Basis Functions. - 6-5 Transform Method. - 6-6 Spectral Model of Shallow-Water Equations. - 6-7 Advection Equation with Finite Elements. - 6-8 Barotropic Vorticity Equation with Finite Elements. - 7 NUMERICAL PREDICTION MODELS. - 7-1 Filtered Models. - 7-1-1 Quasi-Geostrophic Equivalent Barotropic Model. - 7-1-1-1 Energetics of the Barotropic Model. - 7-1-2 Quasi-Geostrophic Multilevel Baroclinic Model. - 7-1-3 Linear Balanced Model. - 7-1-4 Nonlinear Balanced Model. - 7-2 Primitive Equation Models. - 7-2-1 Constraints from Continuous Equations. - 7-2-2 Vertical Differencing. - 7-3 Staggered Grid Systems. - 7-4 Example of a Staggered Primitive Equation Model. - 7-4-1 Equations in Curvilinear Coordinates. - 7-4-2 Horizontal Differencing. - 7-4-3 Energy Conservation. - 7-5 Potential Enstrophy Conserving Scheme. - 7-5-1 Continuous Integral Constraints. - 7-5-2 Difference Equations. - 7-5-3 Constraints Enforced. - 7-6 Spherical Grids. - 7-7 Fine Mesh Modeling. - 7-7-1 One-Way Influence. - 7-7-2 Boundary Conditions. - 7-7-3 Two-Way Interaction. - 7-7-4 Initialization on a Bounded Region. - 7-8 Baroclinic Spectral Models. - 7-9 Isentropic Coordinate Models. - 7-10 Upper Boundary Conditions. - 7-11 Mountain Effects. - 8 BOUNDARY LAYER REPRESENTATIONS. - 8-1 Introduction. - 8-2 Reynolds Equations. - 8-3 Bulk Formulas. - 8-4 Eddy Viscosity, K-Theory. - 8-5 Combined Prandtl and Ekman Layers. - 8-5-1 Prandtl Layer (Neutral Stratification). - 8-5-2 Ekman Layer. - 8-6 Nonneutral Surface Layer. - 8-6-1 Matching Ekman Spiral. - 8-7 Similarity Solutions for the Entire PBL. - 8-7-1 Deardorff Mixed Layer Model. - 8-7-2 Surface Layer. - 8-7-3 Matching Solutions for the Surface and Mixed Layers. - 8-7-4 Surface Wind Direction. - 8-7-5 Modified Transfer Coefficients. - 8-8 A Prediction Equation for h. - 8-8-1 Further Comments on PBL Parameterization. - 8-9 High-Resolution Model. - 8-9-1 The Coefficient of Eddy Viscosity. - 8-9-2 Surface Temperature. - 8-9-3 Some Prediction Model Details. - 8-10 Mean Turbulent Field Closure Models (Second-Order Closure). - 9 INCLUSION OF MOISTURE. - 9-1 Moisture Conservation Equation. - 9-1-1 Modified Thermodynamic Equation. - 9-1-2 Equivalent Potential Temperature and Static Energy. - 9-2 Convective Adjustment. - 9-2-1 Case A. Dry Convection, q 〈 qs. - 9-2-2 Case B. Moist Adjustment q ≥ qs. - 9-3 Modeling Cloud Processes. - 9-3-1 Nonconvective Condensation. - 9-4 Cumulus Parameterization. - 9-4-1 Introduction. - 9-4-2 Kuo Method. - 9-5 Parameterizations Involving Cloud Models. - 9-6 Arakawa and Schubert Model. - 9-6-1 Large-Scale Budget Equations. - 9-6-2 Cloud Budget Equations. - 10 RADIATION PARAMETERIZATION. - 10-1 Terrestrial Radiation. - 10-2 Absorbing Substances. - 10-3 Simplified Transmission Functions. - 10-4 Discretization, Long-Wave Radiation. - 10-4-1 Clear Sky. - 10-4-2 Cloudy Sky. - 10-5 Solar Radiation. - 10-5-1 Clear Sky. - 10-5-2 Cloudy Sky, One Cloud Layer. - 10-5-3 Two Contiguous Cloud Layers. - 10-5-4 Two Separated Cloud Layers. - 10-6 Miscellany. - 11 OBJECTIVE ANALYSIS AND INITIALIZATION. - 11-1 Introduction. - 11-2 A Three-Dimensional Analysis. - 11-3 Statistical Methods, Multivariate Analysis. - 11-4 Initialization. - 11-4-1 Introduction. - 11-4-2 Damping Techniques. - 11-4-3 Static Initialization. - 11-4-4 Variational Method. - 11-4-5 Normal Mode Expansions. - 11-4-6 Variational Normal Mode Initialization. - 11-5 Dynamic Balancing. - 11-6 Four-Dimensional Data Assimilation. - 11-7 Newtonian Relaxation or "Nudging". - 11-8 Smoothing and Filtering. - 11-8-1 Two-Dimensional Smoothers. - 11-8-2 Bandpass Filters. - 11-8-3 Boundary Effects. - 12 OCEAN DYNAMICS AND MODELING. - 12-1 Introduction. - 12-2 Wind-Driven Barotropic Models. - 12-3 Nonlinear Effects. - 12-4 Barotropic Numerical Models. - 12-5 Simple Thermohaline Models. - 12-6 Baroclinic Numerical Models. - 12-7 Bottom Topography Effects. - 12-8 Synoptic Scale Eddies. - 12-9 Mixed Layer Models. - 12-10 Problems in Ocean Modeling. - 13 WEATHER AND CLIMATE PREDICTION. - 13-1 Introduction. - 13-2 Current Forecasting Skill. - 13-2-1 Short Range. - 13-2-2 Medium and Longer Ranges. - 13-2-3 Additional Comments on Forecasting. - 13-3 Predictability of the Atmosphere. - 13-4 Statistical-Dynamical Prediction. - 13-4-1 Simple Empirical Corrections. - 13-4-2 Stochastic-Dynamical Prediction. - 13-5 Climate and Climate Prediction. - Appendix Mathematical Relations. - References. - Index.
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  • 66
    Series available for loan
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    Bremerhaven : Alfred-Wegener-Inst. für Polar- und Meeresforschung
    Associated volumes
    Call number: ZSP-168-11
    In: Berichte zur Polarforschung
    Type of Medium: Series available for loan
    Pages: 40 S. : Kt.
    Series Statement: Berichte zur Polarforschung 11
    Language: English
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  • 67
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    Series available for loan
    Berlin : Nationalkomitee für Geodäsie und Geophysik der DDR bei der Deutschen Akademie der Wissenschaften
    Associated volumes
    Call number: AWI P6-12-0004 ; ZSP-319/A-2(Sonderheft)
    In: Geodätische und geophysikalische Veröffentlichungen : Reihe 1, Sonderheft 1984
    Type of Medium: Series available for loan
    Pages: 64 Seiten , Illustrationen
    ISSN: 0533-7577
    Series Statement: Geodätische und geophysikalische Veröffentlichungen : Reihe 1 Sonderheft 1984
    Language: English , German , Russian
    Note: Contents = Soderžanie = Inhaltsverzeichnis: Foreword = Predislovie = Vorwort. - Meteorological research projects in the Antarctic from 1959 to 1984 = Meteorlogičeskie issledovanija v Antarktike v 1959 - 1984 gg. = Meteorologische Forschungsvorhaben in der Antarktis 1959 - 1984 / G. SKEIB. - Satellite observations over Antarctica = Nabljudenie Antarktiki s iskusstvennych sputnikov Zemli = Satellitenbeobachtungen über Antarktika / H. GERNANDT. - Geophysical investigations carried out by the GDR in Antarctica = Geofizičeskie issledovanija GDR v Antarktide = Geophysikalische Untersuchungen der DDR in Antarktika / M. M. SCHNEIDER, Cl. ELSTNER, V. AUSTER, U. SCHÄFER. - Studies of the upper layers of the Polar atmosphere = Issledovanie poljarnoj verchnej atmosfery = Beiträge zur Untersuchung der polaren Hochatmosphäre / H. GERNANDT, B. SCHÄNING. - Geological activities carried out by the GDR in Antarctica = Geologičeskie raboty GDR v Antarktide = Geologische Aktivitäten der DDR in Antarktika / J. HOFMANN, H.-J. PAECH. - Isotope research in Antarctica = Izotopnye issledovanija v Antarktide = Isotopenforschung in der Antarktis / H. SCHÜTZE, K. FRÖHLICH. - Geodetic-glaciological studies in the East Antarctic 1962-1978 = Geodezičesko-glaciologičeskie raboti v vostočnoj Antarktide v 1962-1978 gg. = Geodätisch-glaziologische Arbeiten in der Ostantarktis (1962-1978) / S. MEIER, R. DIETRICH. - Biological activities within the framework of the Soviet Antarctic Expeditions (25th-29th, 1979-1984) = Biologičeskie raboty vo vremja 25-oj - 29-oj SAĖ (1979-1984) = Biologische Arbeiten im Rahmen der 25.-29. SAE (1979-1984) / K. ODENING. - Abstract on medical research activities by the GDR in the Antarctic = Kratkij otčët medicinskich issledovanij v Antarktide = Kurzer Abriß zur medizinischen Antarktisforschung der DDR / G. SCHRADER, L. KLINKER. - 25 years Antarctic expeditions and their preparation = 25 let antarktičeskim ėkspedicijam i ich podgotovka = 25 Jahre Antarktisexpedition und ihre Vorbereitung / B. TRIPPHAHN. - Bibliography = Bibliografija = Bibliographie. , Text in deutscher, russischer und englischer Sprache , In kyrillischer Schrift
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  • 68
    Call number: AWI G3-24-95700
    Description / Table of Contents: With Arctic ground as a huge and temperature-sensitive carbon reservoir, maintaining low ground temperatures and frozen conditions to prevent further carbon emissions that contrib-ute to global climate warming is a key element in humankind’s fight to maintain habitable con-ditions on earth. Former studies showed that during the late Pleistocene, Arctic ground condi-tions were generally colder and more stable as the result of an ecosystem dominated by large herbivorous mammals and vast extents of graminoid vegetation – the mammoth steppe. Characterised by high plant productivity (grassland) and low ground insulation due to animal-caused compression and removal of snow, this ecosystem enabled deep permafrost aggrad-ation. Now, with tundra and shrub vegetation common in the terrestrial Arctic, these effects are not in place anymore. However, it appears to be possible to recreate this ecosystem local-ly by artificially increasing animal numbers, and hence keep Arctic ground cold to reduce or-ganic matter decomposition and carbon release into the atmosphere. By measuring thaw depth, total organic carbon and total nitrogen content, stable carbon iso-tope ratio, radiocarbon age, n-alkane and alcohol characteristics and assessing dominant vegetation types along grazing intensity transects in two contrasting Arctic areas, it was found that recreating conditions locally, similar to the mammoth steppe, seems to be possible. For permafrost-affected soil, it was shown that intensive grazing in direct comparison to non-grazed areas reduces active layer depth and leads to higher TOC contents in the active layer soil. For soil only frozen on top in winter, an increase of TOC with grazing intensity could not be found, most likely because of confounding factors such as vertical water and carbon movement, which is not possible with an impermeable layer in permafrost. In both areas, high animal activity led to a vegetation transformation towards species-poor graminoid-dominated landscapes with less shrubs. Lipid biomarker analysis revealed that, even though the available organic material is different between the study areas, in both permafrost-affected and sea-sonally frozen soils the organic material in sites affected by high animal activity was less de-composed than under less intensive grazing pressure. In conclusion, high animal activity af-fects decomposition processes in Arctic soils and the ground thermal regime, visible from reduced active layer depth in permafrost areas. Therefore, grazing management might be utilised to locally stabilise permafrost and reduce Arctic carbon emissions in the future, but is likely not scalable to the entire permafrost region.
    Type of Medium: Dissertations
    Pages: X, 104, A-57 Seiten , Illustrationen, Diagramme
    Language: English
    Note: Dissertation, Universität Potsdam, 2024 , Table of contents ABSTRACT ZUSAMMENFASSUNG ABBREVIATIONS AND NOMENCLATURE CHAPTER 1: INTRODUCTION 1.1 SCIENTIFIC BACKGROUND 1.1.1 ARCTIC GROUND 1.1.2 THE PHENOMENON OF PERMAFROST 1.1.3 ARCTIC NON - PERMAFROST AREAS 1.1.4 HYPOTHESIS 1.2 AIMS AND OBJECTIVES 1.3 METHODS 1.3.1 FIELD METHODS AND SAMPLING APPROACH 1.3.2 STUDY AREA SELECTION 1.3.3 LABORATORY METHODS 1.4 THESIS ORGANISATION CHAPTER 2: LARGE HERBIVORES ON PERMAFROST – A PILOT STUDY OF GRAZING IMPACTS ON PERMAFROST SOIL CARBON STORAGE IN NORTHEASTERN SIBERIA 2.1 ABSTRACT 2.2 I NTRODUCTION 2.3 STUDY AREA 2.4 METHODS 2.4.1 FIELD SAMPLING APPROACH 2.4.2 LABORATORY WORK 2.4.3 DATA ANALYSIS AND EXTERNAL DATA 2.5 RESULTS 2.5.1 VEGETATION ASSESSMENT 2.5.2 SEASONAL THAW DEPTH 2.5.3 CARBON PARAMETERS (TOC, TOC/TN RATIOS , AND Δ13 C RATIOS ) 2.5.4 GRAIN SIZE DISTRIBUTION AND WATER CONTENT 2.5.5 STATISTICS AND CORRELATION ANALYSIS 2.6 DISCUSSION 2.6.1 EFFECTS OF GRAZING ON VEGETATION STRUCTURE AND PERMAFROST THAW 2.6.2 CARBON ACCUMULATION UNDER GRAZING IMPACT 2.6.3 METHODOLOGICAL LIMITATIONS OF THE PILOT STUDY 2.7 CONCLUSION 2.8 DATA AVAILABILITY STATEMENT 2.9 AUTHOR CONTRIBUTIONS 2.10 FUNDING 2.11 ACKNOWLEDGEMENTS 2.12 CONFLICT OF INTERESTS CHAPTER 3: IMPACTS OF REINDEER ON SOIL CARBON STORAGE IN THE SEASONALLY FROZEN GROUND OF NORTHERN FINLAND: A PILOT STUDY 3.1 ABSTRACT 3.2 I NTRODUCTION 3.3 STUDY AREA 3.4 METHODS 3.4.1 FIELD WORK 3.4.2 LABORATORY ANALYSIS 3.4.3 DATA ANALYSIS AND CALCULATIONS 3.5 RESULTS 3.5.1 CORE DESCRIPTIONS 3.5.2 VEGETATION 3.5.3 CARBON PARAMETERS 3.5.6 COMPARATIVE DATA ANALYSIS 3.6 DISCUSSION 3.6.1 REINDEER IMPACT ON SOIL CARBON STORAGE 3.6.2 REINDEER IMPACT ON VEGETATION 3.6.3 REINDEER IMPACT ON GROUND CHARACTERISTICS 3.6.4 SOC DENSITY AND STOCKS ACROSS THE KUTUHARJU STATION AREA 3.6.5 METHODOLOGICAL LIMITATIONS OF THE PILOT STUDY DESIGN 3.6.6 IMPLICATIONS OF THE PILOT STUDY FOR FUTURE RESEARCH 3.7 CONCLUSION 3.8 DATA AVAILABILITY 3.9 AUTHOR CONTRIBUTION 3.10 COMPETING INTERESTS 3.11 ACKNOWLEDGEMENTS 3.12 FUNDING TABLE 3-1 TABLE 3-2 TABLE 3-3 CHAPTER 4: LIPID BIOMARKER SCREENING TO TRACE RECENT LARGE HERBIVORE INFLUENCE ON SOIL CARBON IN PERMAFROST AND SEASONALLY FROZEN ARCTIC GROUND 4.1 ABSTRACT 4.2 I NTRODUCTION 4.3 STUDY AREA 4.4 METHODS 4.4.1 SAMPLING APPROACH 4.4.2 LABORATORY ANALYSIS 4.4.3 LIPID BIOMARKER INDICES 4.4.4 STATISTICS 4.5 RESULTS 4.5.1 TOC 4.5.2 C/N RATIO 4.5.3 STABLE CARBON ISOTOPE RATIO 4.5.4 ABSOLUTE N- ALKANE CONCENTRATION 4.5.5 AVERAGE CHAIN LENGTH 4.5.6 CARBON PREFERENCE INDEX 4.5.7 HIGHER - PLANT ALCOHOL INDEX 4.5.8 STATISTICAL RESULTS 4.6 DISCUSSION 4.6.1 EFFECTS OF GRAZING INTENSITY ON BIOMARKER SIGNALS 4.6.2 EFFECTS OF GROUND THERMAL REGIME ON SOIL OM DEGRADATION 4.6.3 I MPACT OF HERBIVORY ON PERMAFROST OM STORAGE 4.7 CONCLUSION 4.8 ACKNOWLEDGEMENTS 4.9 COMPETING INTERESTS 4.10 AUTHOR CONTRIBUTION 4.11 FUNDING 4.12 DATA AVAILABILITY CHAPTER 5: SYNTHESIS 5.1 ECOSYSTEM CHANGES UNDER THE IMPACT OF LARGE HERBIVORES 5.2 GRAZING EFFECTS ON SOIL ORGANIC MATTER DECOMPOSITION 5.3 F EASIBILITY OF UTILISING HERBIVORY IN THE ARCTIC 5.4 RESEARCH IMPLICATIONS FOR SUCCESSFUL PLANNING AND USE OF ARCTIC HERBIVORY REFERENCES 93 FINANCIAL AND TECHNICAL SUPPORT APPENDIX 1 APPENDIX I ORGANIC CARBON CHARACTERISTICS IN ICE - RICH PERMAFROST IN ALAS AND YEDOMA DEPOSITS , CENTRAL YAKUTIA, SIBERIA APPENDIX II WHAT ARE THE EFFECTS OF HERBIVORE DIVERSITY ON TUNDRA ECOSYSTEMS ? A SYSTEMATIC REVIEW (ABSTRACT) APPENDIX III SUPPLEMENTARY MATERIAL TO CHAPTER 2: LARGE HERBIVORES ON PERMAFROST – A PILOT STUDY OF GRAZING IMPACTS ON PERMAFROST SOIL CARBON STORAGE IN NORTHEASTERN SIBERIA APPENDIX IV SUPPLEMENTARY MATERIAL TO CHAPTER 3: IMPACTS OF REINDEER ON SOIL CARBON STORAGE IN THE SEASONALLY FROZEN GROUND OF NORTHERN FINLAND : A PILOT STUDY APPENDIX V SUPPLEMENTARY MATERIAL TO CHAPTER 4: A PILOT STUDY OF LIPID BIOMARKERS TO TRACE RECENT LARGE HERBIVORE INFLUENCE ON SOIL CARBON IN PERMAFROST AND SEASONALLY ROZEN ARCTIC GROUND APPENDIX VI SUPPLEMENTARY MATERIAL TO APPENDIX IV: ORGANIC CARBON CHARACTERISTICS IN ICE - RICH PERMAFROST IN ALAS AND YEDOMA DEPOSITS , CENTRAL YAKUTIA, SIBERIA ACKNOWLEDGEMENTS - DANKSAGUNG
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  • 69
    Call number: AWI A7-24-95703
    Description / Table of Contents: The icosahedral non-hydrostatic large eddy model (ICON-LEM) was applied around the drift track of the Multidisciplinary Observatory Study of the Arctic (MOSAiC) in 2019 and 2020. The model was set up with horizontal grid-scales between 100m and 800m on areas with radii of 17.5km and 140 km. At its lateral boundaries, the model was driven by analysis data from the German Weather Service (DWD), downscaled by ICON in limited area mode (ICON-LAM) with horizontal grid-scale of 3 km. The aim of this thesis was the investigation of the atmospheric boundary layer near the surface in the central Arctic during polar winter with a high-resolution mesoscale model. The default settings in ICON-LEM prevent the model from representing the exchange processes in the Arctic boundary layer in accordance to the MOSAiC observations. The implemented sea-ice scheme in ICON does not include a snow layer on sea-ice, which causes a too slow response of the sea-ice surface temperature to atmospheric changes. To allow the sea-ice surface to respond faster to changes in the atmosphere, the implemented sea-ice parameterization in ICON was extended with an adapted heat capacity term. The adapted sea-ice parameterization resulted in better agreement with the MOSAiC observations. However, the sea-ice surface temperature in the model is generally lower than observed due to biases in the downwelling long-wave radiation and the lack of complex surface structures, like leads. The large eddy resolving turbulence closure yielded a better representation of the lower boundary layer under strongly stable stratification than the non-eddy-resolving turbulence closure. Furthermore, the integration of leads into the sea-ice surface reduced the overestimation of the sensible heat flux for different weather conditions. The results of this work help to better understand boundary layer processes in the central Arctic during the polar night. High-resolving mesoscale simulations are able to represent temporally and spatially small interactions and help to further develop parameterizations also for the application in regional and global models.
    Type of Medium: Dissertations
    Pages: xii, 110 Seiten , Illustrationen, Diagramme
    Language: English
    Note: Dissertation, Universität Potsdam, 2023 , Contents 1. Introduction 2. Boundary Layers Types of the Atmosphere 2.1. The Convective Boundary Layer (CBL) 2.2. The Neutral Boundary Layer (NBL) 2.3. The Stable Boundary Layer (SBL) 3. The Closure problem 4. Model description 4.1. Applied model versions 4.2. Governing equations 4.3. Horizontal grid 4.4. Vertical grid 4.5. Lateral boundaries 4.6. Parametrizations 4.6.1. Radiation scheme 4.6.2. Microphysics 4.6.3. Mellor-Yamada scheme 4.6.4. Smagorinsky scheme 4.6.5. Sea ice scheme 4.7. Difference to classical LES Models 5. Experimental Setup 6. MOSAiC Measurements 6.1. ARM Meteorological tower 6.2. Radiosondes 7. Model evaluation for the central Arctic 7.1. Impact of the horizontal resolution 7.1.1. Under cold, light wind conditions 7.1.2. Under stormy conditions 7.2. Impact of the sea-ice scheme 7.3. Impact of the lower boundary conditions 7.4. Impact of the parametrization schemes under cold, light wind conditions 7.4.1. Near-surface variables 7.4.2. Vertical profiles 7.4.3. Surface fluxes 7.4.4. Boundary Layer Height 7.5. Impact of the parametrization schemes under stormy conditions 7.5.1. Near-surface variables 7.5.2. Vertical profiles 7.5.3. Surface fluxes 7.5.4. Boundary Layer height 8. Discussion and Summary Acknowledgements Appendix
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  • 70
    Call number: AWI A11-22-94735
    Description / Table of Contents: Over the last decades, the rate of near-surface warming in the Arctic is at least double than elsewhere on our planet (Arctic amplification). However, the relative contribution of different feedback processes to Arctic amplification is a topic of ongoing research, including the role of aerosol and clouds. Lidar systems are well-suited for the investigation of aerosol and optically-thin clouds as they provide vertically-resolved information on fine temporal scales. Global aerosol models fail to converge on the sign of the Arctic aerosol radiative effect (ARE). In the first part of this work, the optical and microphysical properties of Arctic aerosol were characterized at case study level in order to assess the short-wave (SW) ARE. A long-range transport episode was first investigated. Geometrically similar aerosol layers were captured over three locations. Although the aerosol size distribution was different between Fram Strait(bi-modal) and Ny-Ålesund (fine mono-modal), the atmospheric column ARE was similar. The latter was related to the domination of accumulation mode aerosol. Over both locations top of the atmosphere (TOA) warming was accompanied by surface cooling. Subsequently, the sensitivity of ARE was investigated with respect to different aerosol and spring-time ambient conditions. A 10% change in the single-scattering albedo (SSA) induced higher ARE perturbations compared to a 30% change in the aerosol extinction coefficient. With respect to ambient conditions, the ARETOA was more sensitive to solar elevation changes compared to AREsur f ace. Over dark surfaces the ARE profile was exclusively negative, while over bright surfaces a negative to positive shift occurred above the aerosol layers. Consequently, the sign of ARE can be highly sensitive in spring since this season is characterized by transitional surface albedo conditions. As the inversion of the aerosol microphysics is an ill-posed problem, the inferred aerosol size distribution of a low-tropospheric event was compared to the in-situ measured distribution. Both techniques revealed a bi-modal distribution, with good agreement in the total volume concentration. However, in terms of SSA a disagreement was found, with the lidar inversion indicating highly scattering particles and the in-situ measurements pointing to absorbing particles. The discrepancies could stem from assumptions in the inversion (e.g. wavelength-independent refractive index) and errors in the conversion of the in-situ measured light attenuation into absorption. Another source of discrepancy might be related to an incomplete capture of fine particles in the in-situ sensors. The disagreement in the most critical parameter for the Arctic ARE necessitates further exploration in the frame of aerosol closure experiments. Care must be taken in ARE modelling studies, which may use either the in-situ or lidar-derived SSA as input. Reliable characterization of cirrus geometrical and optical properties is necessary for improving their radiative estimates. In this respect, the detection of sub-visible cirrus is of special importance. The total cloud radiative effect (CRE) can be negatively biased, should only the optically-thin and opaque cirrus contributions are considered. To this end, a cirrus retrieval scheme was developed aiming at increased sensitivity to thin clouds. The cirrus detection was based on the wavelet covariance transform (WCT) method, extended by dynamic thresholds. The dynamic WCT exhibited high sensitivity to faint and thin cirrus layers (less than 200 m) that were partly or completely undetected by the existing static method. The optical characterization scheme extended the Klett–Fernald retrieval by an iterative lidar ratio (LR) determination (constrained Klett). The iterative process was constrained by a reference value, which indicated the aerosol concentration beneath the cirrus cloud. Contrary to existing approaches, the aerosol-free assumption was not adopted, but the aerosol conditions were approximated by an initial guess. The inherent uncertainties of the constrained Klett were higher for optically-thinner cirrus, but an overall good agreement was found with two established retrievals. Additionally, existing approaches, which rely on aerosol-free assumptions, presented increased accuracy when the proposed reference value was adopted. The constrained Klett retrieved reliably the optical properties in all cirrus regimes, including upper sub-visible cirrus with COD down to 0.02. Cirrus is the only cloud type capable of inducing TOA cooling or heating at daytime. Over the Arctic, however, the properties and CRE of cirrus are under-explored. In the final part of this work, long-term cirrus geometrical and optical properties were investigated for the first time over an Arctic site (Ny-Ålesund). To this end, the newly developed retrieval scheme was employed. Cirrus layers over Ny-Ålesund seemed to be more absorbing in the visible spectral region compared to lower latitudes and comprise relatively more spherical ice particles. Such meridional differences could be related to discrepancies in absolute humidity and ice nucleation mechanisms. The COD tended to decline for less spherical and smaller ice particles probably due to reduced water vapor deposition on the particle surface. The cirrus optical properties presented weak dependence on ambient temperature and wind conditions. Over the 10 years of the analysis, no clear temporal trend was found and the seasonal cycle was not pronounced. However, winter cirrus appeared under colder conditions and stronger winds. Moreover, they were optically-thicker, less absorbing and consisted of relatively more spherical ice particles. A positive CREnet was primarily revealed for a broad range of representative cloud properties and ambient conditions. Only for high COD (above 10) and over tundra a negative CREnet was estimated, which did not hold true over snow/ice surfaces. Consequently, the COD in combination with the surface albedo seem to play the most critical role in determining the CRE sign over the high European Arctic.
    Type of Medium: Dissertations
    Pages: x, 136 Seiten , Illustrationen, Diagramme, Karten
    Language: English
    Note: Dissertation, Universität Potsdam, 2021 , CONTENTS 1 INTRODUCTION 1.1 Motivation: Aerosol and cloud relevance to Arctic amplification 1.2 Theoretical background 1.2.1 Atmospheric aerosol 1.2.2 Aerosol in the Arctic 1.2.3 Cirrus clouds 1.3 Research questions 2 METHODS 2.1 lidar remote sensing techniqu 2.1.1 Elastic and Raman lidar equations 2.1.2 lidar signal corrections 2.1.3 Derivation of particle optical properties and related uncertainties 2.2 Lidar systems 2.2.1 Ground-based system KARL 2.2.2 Air-borne system AMALi 2.2.3 Space-borne system CALIOP 2.3 Ancillary instrumentation 2.3.1 Radiosondes 2.3.2 Sun-photometers 2.3.3 Radiation sensors 2.4 Modeling tools 2.4.1 Air mass backward trajectories 2.4.2 Aerosol microphysics retrieval algorithm 2.4.3 Radiative transfer model SCIATRAN 2.4.4 Multiple-scattering correction model 2.4.5 Simplified cloud radiative effect model 3 ARCTIC AEROSOL PROPERTIES AND RADIATIVE EFFECT (CASE STUDIES) 3.1 Aerosol in the upper troposphere (Spring) 3.1.1 Overview of aerosol observations and air mass origin 3.1.2 Modification of aerosol optical and microphysical properties 3.1.3 Aerosol radiative effect (ARE) 3.2 Sensitivities of the spring-time Arctic ARE 3.2.1 Sensitivity on aerosol related parameters 3.2.2 Sensitivity on ambient conditions 3.3 Aerosol in the lower troposphere (Winter) 3.3.1 Overview of remote sensing and in-situ measurements 3.3.2 Aerosol properties from the remote sensing perspective: KARL and CALIOP 3.3.3 Aerosol microphysical properties from in-situ and remote sensing perspectives 3.4 Discussion and Conclusions 4 DEVELOPMENT OF A CIRRUS CLOUD RETRIEVAL SCHEME 4.1 Fine-scale cirrus cloud detection 4.1.1 Selection of cirrus clouds 4.1.2 Wavelet Covariance Transform method 4.1.3 Revised detection method: Dynamic Wavelet Covariance Transform 4.2 Comparison of dynamic and static cirrus detection 4.3 Cirrus cloud optical retrievals 4.3.1 Existing cirrus optical retrievals: double-ended Klett and Raman 4.3.2 Temporal averaging within stationary periods 4.3.3 Revised optical retrieval: constrained Klett method 4.4 Comparison to established optical retrievals 4.5 How uncertainties in cirrus detection affect the optical retrievals? 4.6 Discussion 4.6.1 Limitations of cirrus retrieval schemes 4.6.2 Strengths of the revised retrieval scheme 4.7 Conclusions 5 LONG-TERM ANALYSIS OF ARCTIC CIRRUS CLOUD PROPERTIES 5.1 Overview of cirrus occurrence and meteorological conditions over Ny-Ålesund 5.2 Quality assurance of optical properties 5.2.1 Specular reflection effect 5.2.2 Investigation of extreme cirrus lidar ratio values 5.2.3 Multiple-scattering correction 5.3 Overview of cirrus optical properties over Ny-Ålesund 5.4 Inter-relations of cirrus properties 5.5 Dependence on meteorological conditions 5.5.1 Cirrus clouds in the tropopause 5.6 CRE estimation at TOA: sensitivity analysis 5.7 Conclusions 6 CONCLUSIONS AND OUTLOOK A CIRRUS DETECTION SENSITIVITIES a.1 Wavelet Covariance Transform - dilation sensitivity a.2 Wavelet Covariance Transform - wavelength dependency B CIRRUS OPTICAL CHARACTERIZATION SENSITIVITIES b.1 Reference value accuracy and limitations b.2 Inherent uncertainties of constrained Klett C MULTIPLE-SCATTERING CORRECTION FOR CIRRUS CLOUDS D SEASONAL CIRRUS PROPERTIES: DESCRIPTIVE STATISTICS BIBLIOGRAPHY
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  • 71
    Call number: AWI G5-22-94780
    Type of Medium: Dissertations
    Pages: xxi, 201 Seiten , Illustrationen, Diagramme
    Language: English
    Note: Dissertation, Universität Potsdam, 2021 , Contents List of Figures List of Tables I Preamble 1 Introduction 1.1.1 The Journey from Weather to Climate 1.1.2 The Climate Background 1.1.3 Pollen as Quantitative Indicators of Past Changes 1.2 Overview and Aims of Manuscripts 1.2.1 List of Manuscripts 1.2.2 Short Summaries of the Manuscripts 1.3 Author Contributions to the Manuscripts II Manuscripts 2 Comparing estimation of techniques for temporal Scaling 2.1 Introduction 2.2 Data and Methods 2.2.1 Scaling estimation methods 2.2.2 Evaluation of the estimators 2.2.3 Data 2.3 Results 2.3.1 Effect of Regular and Irregular Sampling 2.3.2 Effect of Time series length 2.3.3 Application to database 2.4 Discussion 2.5 Conclusions 3 Land temperature variability driven by oceans at millennial timescales 4 Variability of surface climate in simulations of past and future 4.1 Introduction 4.2 Data and Method 4.2.1 Model simulations 4.2.2 The Last Glacial Maximum experiment 4.2.3 The mid Holocene experiment (midHolocene) 4.2.4 The warming experiments 1pctCO2 and abrupt4xCO2 4.2.5 Preprocessing of model simulations 4.2.6 Comparisons across the ensemble 4.2.7 Diagnosing variability changes 4.2.8 Changes in precipitation extremes 4.2.9 Timescale-dependence of the variability changes 4.3 Results 4.3.1 Hydrological sensitivity across the ensemble 4.3.2 Changes in local interannual variability 4.3.3 Changes in modes of variability 4.3.4 Circulation patterns underlying extratropical precipitation extremes 4.3.5 Changes in. the spectrum of variability 4.4 Discussion 4.4.1 Changes in climate variability with global mean temperature 4.4.2 Temperature vs. precipitation scaling 4.4.3 Comparison to climate reconstructions and observations 4.4.4 Limitations 4.5 Conclusions 5 Holocene vegetation variability in the Northern Hemisphere 5.1 Introduction 5.2 Data and Methods 5.2.1 Pollen Database 5.2.2 Principal Component Analysis 5.2.3 Timescale-dependent Estimates of Variability 5.2.4 Biome Classification 5.3 Results 5.3.1 General Vegetation Variability Analysis 5.3.2 Comparison of Forested and Open Land Vegetations 5.3.3 Comparison of Broadleaf and Needleleaf Fore ts 5.3.4 Comparison of Temperate and Boreal Coniferous Forests 5.3.5 Comparison of Evergreen and Deciduous Boreal Forests 5.4 Discussion 5.5 Conclusion III Postamble 6 General discussion and conclusion 6.1 Overview 6.2 Timescale-Dependent Estimates of Variability 6.3 Climate and Vegetation Variabilities in the Holocene 6.4 Implications for the 21th Century 6.5 Outlook IV Appendix A Supplementary figures from "Comparing estimation techniques for temporal scaling in paleo-climate timeseries" A.1 Block Average Results A.2 First-Order Correction for the Effect of Interpolation A.3 Change in Bias and Standard Deviation B Methods and supplementary information from "Land temperature variability driven by oceans at millennial timescales" B.1 Methods B.1.1 Reconstructions B.1.2 Significance Testing B.1.3 Testing for Anthropogenic Impacts B.1.4 Instrumental Data B.1.5 Model Data B.1.6 Spectral Estimates B.1.7 Variance Ratios B.1.8 Sub-Decadal Variability Binning B.1.9 Correlation B.1.10 Moran's I B.2 Supplementary Information B.2.1 Tree Ring Data Analysis B.2.2 Energy-Balance Equations B.3 Extended Data Figures C Supplementary figures from "Variability of surface climate in simulations of past and future" D Supplementary figures from "Characterization of holocene vegetation variability in the Northern Hemisphere" Bibliography
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  • 72
    Series available for loan
    Series available for loan
    College, Alas. : Division of Geological and Geophysical Surveys
    Call number: AWI G3-23-95009
    Type of Medium: Series available for loan
    Pages: IX,109 Seiten , Illustrationen
    Series Statement: Special report / Division of Geological and Geophysical Surveys 15
    Language: English
    Note: CONTENTS Introduction Sources of information Acknowledgments Physical setting of the Fairbanks area Topography and geology Climate Selected references Frozen ground Seasonally frozen ground Definition The problem Cause of frost heaving Frost action in the Fairbanks area Frost action on pile construction Highway bridges The Alaska Railroad Trans-Alaska Pipeline System Other frost-heave problems Loss of bearing strength Solutions to the frost-action problem Permafrost Definition The problem Origin and thermal regime Distribution and thickness Permafrost in the Fairbanks area Permafrost of the flood plain Permafrost of alluvial fans, colluvial slopes, and silt lowlands Boundaries between permafrost and non permafrost areas Character of ground ice Principles of land use in permafrost areas Ground subsidence caused by thawing of ice-rich permafrost Preliminary statement Thermokarst phenomena General features Therrnokarst mounds Therrnokarst pits Effects on agricultural development Effects on railroads Effects on roads and highways Effects on airfields Effects on heated buildings Effects on natural-gas and oil pipelines General statement Gas pipelines Trans-Alaska Pipeline System Effects on buried utility lines Indicators of permafrost Recognition of the problem Vegetation Small landforms and natural surface patterns Selected references Ground water Preliminary statement Ground water in the Fairbanks area Preliminary statement Tanana and Chena River flood plains Upland hills Lower hillslopes and creek-valley bottoms Geologic hazards associated with ground-water movement in permafrost regions Preliminary statement Artesian wells Icings Seepage icings Stream icings Summary of icings Pingos Selected references Earthquakes Introduction Causes and locations of earthquakes Classification and terminology of earthquakes Earthquake hazards in the Fairbanks area Summary of the earthquake hazard Selected references Landslides Landslides in the Fairbanks area Selected references Hillside erosion in loess Preliminary statement Examples of loess erosion Selected references Flooding Introduction History of flooding in the Fairbanks area Frequency of flooding in the Fairbanks area Solution to the problem of flooding Introduction Structural measures Nonstructural measures Flood proofing Flood warning and evacuation Flood insurance Selected references , Englisch
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  • 73
    Series available for loan
    Series available for loan
    Fairbanks, Alaska : Division of Geological & Geophysical Surveys, Dept. of Natural Resources, State of Alaska
    Call number: AWI G3-22-94974
    Type of Medium: Series available for loan
    Pages: x, 230 Seiten , Illustrationen , 28 cm
    Series Statement: Guidebook / Division of Geological & Geophysical Surveys, Department of Natural Resources, State of Alaska 4
    Language: English
    Note: CONTENTS Introduction History and development along the Elliott and Dalton Highways Elliott Highway Hickel Highway Dalton Highway Trans-Alaska Pipeline System Climate Temperature Precipitation Physiography Permafrost and ground ice Hydrology Icings Pingos Geology Bedrock geology Glacial geology of the Brooks Range Vegetation Bottomland spruce-poplar forest Upland spruce-hardwood forest Lowland spruce-hardwood forest High shrub Low shrub bogs Moist tundra Wet tundra Alpine tundra Disturbance patterns Flora Soils Road log Introduction Fox Fox - Livengood Livengood Livengood - Yukon River Yukon River region and crossing Yukon River - Atigun Pass Cirque glaciation and processes in the Atigun Pass area Slushflow activity in the Atigun Pass area Atigun Valley - Prudhoe Bay The Prudhoe Bay region Oil-field development Geology Geomorphology. soils, and vegetation Selected references Appendix A - Soil taxonomy Appendix B - List of plants
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  • 74
    Call number: AWI Bio-21-94346
    In: Bibliotheca diatomologica, 3
    Type of Medium: Monograph available for loan
    Pages: 386 Seiten
    ISBN: 3768213757
    Series Statement: Bibliotheca diatomologica 3
    Language: English
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  • 75
    Call number: AWI G5-98-0371
    In: SEPM short course, No. 10
    Type of Medium: Monograph available for loan
    Pages: Getrennte Zählung , Illustrationen , 30 cm
    Series Statement: SEPM short course 10
    Language: English
    Note: CONTENTS: Introduction / Michael A. Arthur. - Chapter 1: Stable isotopes of oxygen and carbon and their application to sedimentologic and paleoenvironmental problems / Thomas F. Anderson and Michael A. Arthur. - Chapter 2: Stable isotopes of sulfur, nitrogen and deuterium in recent marine environments / Ian R. Kaplan. - Chapter 3: Chemical diagenesis of carbonates: theory and application of trace element technique / Ján Veizer. - Chapter 4: The application of stable isotopes to studies of the origin of dolomite and to problems of diagenesis of clastic sediments / Lynton S. Land. - Bibliography.
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  • 76
    Series available for loan
    Series available for loan
    Bremerhaven : Alfred-Wegener-Inst. für Polar- und Meeresforschung
    Associated volumes
    Call number: ZSP-168-8
    In: Berichte zur Polarforschung
    Type of Medium: Series available for loan
    Pages: 20 S. : graph. Darst.
    Series Statement: Berichte zur Polarforschung 8
    Language: English
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  • 77
    Call number: AWI G9-89-0476
    In: International Union of Geological Sciences : Series B, Number 4
    Description / Table of Contents: Antarctic Geoscience is the proceedings volume of the Third Symposium on Antarctic Geology and Geophysics, held in Madison, Wisconsin. The 151 chapters in the book, which include both review papers and original contributions, range over all major fields of geoscience. At a time when interest in Antarctica, its geologic history, and its mineral resource potential is increasing, this book provides the most current and comprehensive overview of the subject. These papers, representing the recent work of many scientists from fifteen nations, offer a balanced assessment of current thought and knowledge concerning the geology and geoscience of Antarctica and the surrounding oceanic regions. Together, they constitute the most up-to-date reference work on Antarctic earth sciences. The book is divided into twelce sections: Gondwanaland (11 chapters), Scotia Arc Region (39, East Antarctica Shield (14), Upper Precambrian-Paleozoic Rocks (11), Paleontology (8), Igneous Rocks (14), Structural Geology and Tectonics (9), Mineral Deposits (4), Crustal Structure (13), Subglacial Morphology (4), Marine Geology (8), and Cenozoic History (16). The volume is generously illustrated with photographs and line drawings and includes a large color geologic map of the continent.
    Type of Medium: Monograph available for loan
    Pages: 1172 Seiten , Illustrationen , 29 cm
    Edition: First printing
    ISBN: 0299084108 , 0-299-08410-8
    Series Statement: International Union of Geological Sciences : Series B Number 4
    Language: English
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  • 78
    Call number: AWI G5-22-94845
    In: Developments in paleoenvironmental research, 22
    Description / Table of Contents: This book addresses the main enigmas of Easter Island’s (Rapa Nui, in the Polynesian language) prehistory from the time of initial settlement to European contact with a multidisciplinary perspective. The main topics include: (i) the time of first settlement and the origin of the first settlers; (ii) the main features of prehistoric Rapanui culture and their changes; (iii) the deforestation of the island and its timing and causes; (iv) the extinction of the indigenous biota, (v) the occurrence of climatic shifts and their potential effects on socioecological trends; (vi) the evidence for a cultural and demographic collapse before European contact; and (vii) the influence of Europeans on prehistoric Rapanui society. The book is subdivided into thematic sections and each chapter is written by renowned specialists in disciplines such as archaeology, anthropology, paleoecology, ethnography, linguistics, ethnobotany, phylogenetics/phylogeography and history. Contributors have been invited to provide an open and objective vision that includes as many views as possible on the topics considered. In this way, the readers may be able to compare different of points of view and make their own interpretations on each of the subjects considered. The book is intended for a wide audience including graduate students, advanced undergraduate students, university teachers and researchers interested in the subject. Given its multidisciplinary character and the topics included, the book is suitable for students and researchers from a wide range of disciplines and interests.
    Type of Medium: Monograph available for loan
    Pages: XII, 628 Seiten , Illustrationen
    ISBN: 978-3-030-91126-3
    Series Statement: Developments in paleoenvironmental research 22
    Language: English
    Note: Contents: Introduction / Valentí Rull, Christopher Stevenson Transpacific Voyaging and Settlement Ex Oriente Lux: Amerindian Seafaring and Easter Island Contact Revisited / Atholl Anderson Commensals/Domesticates on Rapa Nui: What Can Their Phylogeographic Patterns Tell Us About the Discovery and Settlement of the Island? / Vicki A. Thomson, Michael Herrera, Jeremy J. Austin Sweet Potato on Rapa Nui: Insights from a Monographic Study of the Genus Ipomoea / Pablo Muñoz-Rodríguez, John R. I. Wood, Robert W. Scotland Pre-European Contact Sweet Potato (Ipomoea batatas) at Rapa Nui: Macrobotanical Evidence from Recent Excavations in Rano Raraku Quarry, Rapa Nui / Jo Anne Van Tilburg, Jennifer M. Huebert, Sarah C. Sherwood, Casey R. Barrier Anakena Re-visited: New Perspectives on Old Problems at Anakena, Rapa Nui / Paul Wallin, Helene Martinsson-Wallin The Ancient Rapanui Culture A Behavioral Assessment of Refuge Caves (ana kionga) on Rapa Nui / Christopher Stevenson, José Miguel Ramrez-Aliaga, Juan Gongalves Borrega Vinapū Area Re-visited / Helene Martinsson-Wallin Undelivered Moai or Unidentified Monument? / Nicolas Cauwe, Morgan De Dapper Platforms in Motion: A Genealogical Architecture / Nicolas Cauwe Climatic and Environmental Change Climatology of Rapa Nui (Isla de Pascua, Easter Island) / Raymond S. Bradley, William J. D’Andrea, Henry F. Diaz, Liang Ning Prehistoric Paleoecology of Easter Island / Valentí Rull Geological and Climatic Features, Processes and Interplay Determining the Human Occupation and Habitation of Easter Island / Alberto Sáez, Olga Margalef, Laura Becerril, Christian Herrera, James Goff, Sergi Pla-Rabes et al. Deforestation and Extinctions The Flora and Vegetation of Easter Island: Past and Present / Georg Zizka, Alexander Zizka Palms for the Archaeologist / Daniel W. Ingersoll Jr., Kathleen B. Ingersoll, Fred W. Stauffer Spatio-Temporal Patterns of Deforestation, Settlement, and Land Use on Easter Island Prior to European Arrivals / Peter Steiglechner, Agostino Merico Economic Causes and Consequences of Deforestation on Easter Island / James A. Brander Palm Forest to Gardens and Grassland: A Study of Environmental and Geomorphological Changes of the Te Niu, Rapa Nui Landscape / Joan A. Wozniak Collapse or Resilience? Environmental Change and Cultural Continuity: Extraordinary Achievements of the Rapanui Society after Deforestation / Andreas Mieth, Annette Kühlem, Burkhard Vogt, Hans-Rudolf Bork Ecology Limits Population, But Interaction with Culture Defines It: Carrying Capacity on Rapa Nui / Cedric O. Puleston, Thegn N. Ladefoged Population Principles, Climate Change, and the “Collapse” of the Rapa Nui Society / Mauricio Lima, Eugenia M. Gayo, Sergio A. Estay, Nils Chr. Stenseth Claims and Evidence in the Population History of Rapa Nui (Easter Island) / Carl P. Lipo, Robert J. DiNapoli, Terry L. Hunt European Contact The Human Giants of Easter Island (Rapa Nui) / Jan J. Boersema Synthesis Towards a Holistic Approach to Easter Island’s Prehistory / Valentí Rull, Christopher Stevenson
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  • 79
    Call number: AWI G8-23-95167
    Description / Table of Contents: The Arctic nearshore zone plays a key role in the carbon cycle. Organic-rich sediments get eroded off permafrost affected coastlines and can be directly transferred to the nearshore zone. Permafrost in the Arctic stores a high amount of organic matter and is vulnerable to thermo-erosion, which is expected to increase due to climate change. This will likely result in higher sediment loads in nearshore waters and has the potential to alter local ecosystems by limiting light transmission into the water column, thus limiting primary production to the top-most part of it, and increasing nutrient export from coastal erosion. Greater organic matter input could result in the release of greenhouse gases to the atmosphere. Climate change also acts upon the fluvial system, leading to greater discharge to the nearshore zone. It leads to decreasing sea-ice cover as well, which will both increase wave energy and lengthen the open-water season. Yet, knowledge on these processes and the resulting impact on the nearshore zone is scarce, because access to and instrument deployment in the nearshore zone is challenging. Remote sensing can alleviate these issues in providing rapid data delivery in otherwise non-accessible areas. However, the waters in the Arctic nearshore zone are optically complex, with multiple influencing factors, such as organic rich suspended sediments, colored dissolved organic matter (cDOM), and phytoplankton. The goal of this dissertation was to use remotely sensed imagery to monitor processes related to turbidity caused by suspended sediments in the Arctic nearshore zone. In-situ measurements of water-leaving reflectance and surface water turbidity were used to calibrate a semi-empirical algorithm which relates turbidity from satellite imagery. Based on this algorithm and ancillary ocean and climate variables, the mechanisms underpinning nearshore turbidity in the Arctic were identified at a resolution not achieved before. The calibration of the Arctic Nearshore Turbidity Algorithm (ANTA) was based on in-situ measurements from the coastal and inner-shelf waters around Herschel Island Qikiqtaruk (HIQ) in the western Canadian Arctic from the summer seasons 2018 and 2019. It performed better than existing algorithms, developed for global applications, in relating turbidity from remotely sensed imagery. These existing algorithms were lacking validation data from permafrost affected waters, and were thus not able to reflect the complexity of Arctic nearshore waters. The ANTA has a higher sensitivity towards the lowest turbidity values, which is an asset for identifying sediment pathways in the nearshore zone. Its transferability to areas beyond HIQ was successfully demonstrated using turbidity measurements matching satellite image recordings from Adventfjorden, Svalbard. The ANTA is a powerful tool that provides robust turbidity estimations in a variety of Arctic nearshore environments. Drivers of nearshore turbidity in the Arctic were analyzed by combining ANTA results from the summer season 2019 from HIQ with ocean and climate variables obtained from the weather station at HIQ, the ERA5 reanalysis database, and the Mackenzie River discharge. ERA5 reanalysis data were obtained as domain averages over the Canadian Beaufort Shelf. Nearshore turbidity was linearly correlated to wind speed, significant wave height and wave period. Interestingly, nearshore turbidity was only correlated to wind speed at the shelf, but not to the in-situ measurements from the weather station at HIQ. This shows that nearshore turbidity, albeit being of limited spatial extent, gets influenced by the weather conditions multiple kilometers away, rather than in its direct vicinity. The large influence of wave energy on nearshore turbidity indicates that freshly eroded material off the coast is a major contributor to the nearshore sediment load. This contrasts results from the temperate and tropical oceans, where tides and currents are the major drivers of nearshore turbidity. The Mackenzie River discharge was not identified as a driver of nearshore turbidity in 2019, however, the analysis of 30 years of Landsat archive imagery from 1986 to 2016 suggests a direct link between the prevailing wind direction, which heavily influences the Mackenzie River plume extent, and nearshore turbidity around HIQ. This discrepancy could be caused by the abnormal discharge behavior of the Mackenzie River in 2019. This dissertation has substantially advanced the understanding of suspended sediment processes in the Arctic nearshore zone and provided new monitoring tools for future studies. The presented results will help to understand the role of the Arctic nearshore zone in the carbon cycle under a changing climate.
    Type of Medium: Dissertations
    Pages: xv, ii, 85, xvii Seiten , Illustrationen, Diagramme, Karten
    Language: English
    Note: Dissertation, Universität Potsdam, 2022 (kumulative Dissertation) , TABLE OF CONTENTS Abstract Zusammenfassung Allgemeinverständliche Zusammenfassung List of Figures List of Tables Funding Chapter 1 Introduction 1.1 Scientific Background 1.1.1 Arctic Climate Change 1.1.2 The Arctic Nearshore Zone 1.1.3 Ocean Color Remote Sensing 1.2 Objectives 1.3 Study Area 1.4 Methods 1.4.1 Field Sampling 1.4.2 Data Processing 1.4.3 Satellite Imagery Processing 1.5 Thesis Structure 1.6 Author Contributions Chapter 2 Long-Term High-Resolution Sediment and Sea Surface Temperature Spatial Patterns in Arctic Nearshore Waters retrived using 30-year Landsat Archive Imagery 2.1 Abstract 2.2 Introduction 2.3 Material and Methods 2.3.1 Regional Setting 2.3.2 Landsat Images Acquisition and Processing 2.3.3 Landsat Turbidity Retrieval 2.3.4 Transects in the nearshore zone 2.3.5 Wind Data 2.4 Results 2.4.1 Brightness Temperature 2.4.2 Surface Reflectance and Turbidity Mapping 2.4.3 Gradients in the nearshore zone 2.5 Discussion 2.6 Conclusion Appendix A Chapter 3 The Arctic Nearshore Turbidity Algorithm (ANTA) - A Multi Sensor Turbidity Algorithm for Arctic Nearshore Environments 3.1 Abstract 3.2 Introduction 3.3 Methods 3.3.1 Regional setting 3.3.2 In-situ sampling 3.3.3 Optical data processing 3.3.4 Algorithm tuning 3.3.5 Satellite imagery processing 3.4 Results and Discussion 3.4.1 Turbidity and SPM 3.4.2 ANTA performance 3.4.3 Comparison with the Dogliotti et al., (2015) algorithm 3.4.4 Test and transfer of the ANTA 3.5 Conclusion Chapter 4 Drivers of Turbidity and its Seasonal Variability in the Nearshore Zone of Herschel Island Qikiqtaruk (western Canadian Arctic) 4.1 Abstract 4.2 Introduction 4.3 Methods 4.3.1 Study Area 4.3.2 Satellite Imagery 4.3.3 In-situ data 4.3.4 Reanalysis data 4.4 Results and Discussion 4.4.1 Time Series Analysis 4.4.2 Drivers of turbidity 4.5 Conclusion Chapter 5 Synthesis 5.1 Applicability of Remote Sensing Algorithms in the Arctic Nearshore Zone 5.2 Drivers of Nearshore Turbidity 5.3 Spatial Variations of Nearshore Turbidity 5.4 Challenges and Outlook List of Acronyms Bibliography Danksagung
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  • 80
    Call number: AWI Bio-23-95302
    Description / Table of Contents: Climate change of anthropogenic origin is affecting Earth’s biodiversity and therefore ecosystems and their services. High latitude ecosystems are even more impacted than the rest of Northern Hemisphere because of the amplified polar warming. Still, it is challenging to predict the dynamics of high latitude ecosystems because of complex interaction between abiotic and biotic components. As the past is the key to the future, the interpretation of past ecological changes to better understand ongoing processes is possible. In the Quaternary, the Pleistocene experienced several glacial and interglacial stages that affected past ecosystems. During the last Glacial, the Pleistocene steppe-tundra was covering most of unglaciated northern hemisphere and disappeared in parallel to the megafauna’s extinction at the transition to the Holocene (~11,700 years ago). The origin of the steppe-tundra decline is not well understood and knowledge on the mechanisms, which caused shifts in past communities and ecosystems, is of high priority as they are likely comparable to those affecting modern ecosystems. Lake or permafrost core sediments can be retrieved to investigate past biodiversity at transitions between glacial and interglacial stages. Siberia and Beringia were the origin of dispersal of the steppe-tundra, which make investigation this area of high priority. Until recently, macrofossils and pollen were the most common approaches. They are designed to reconstruct past composition changes but have limit and biases. Since the end of the 20th century, sedimentary ancient DNA (sedaDNA) can also be investigated. My main objectives were, by using sedaDNA approaches to provide scientific evidence of compositional and diversity changes in the Northern Hemisphere ecosystems at the transition between Quaternary glacial and interglacial stages. In this thesis, I provide snapshots of entire ancient ecosystems and describe compositional changes between Quaternary glacial and interglacial stages, and confirm the vegetation composition and the spatial and temporal boundaries of the Pleistocene steppe-tundra. I identify a general loss of plant diversity with extinction events happening in parallel of megafauna’ extinction. I demonstrate how loss of biotic resilience led to the collapse of a previously well-established system and discuss my results in regards to the ongoing climate change. With further work to constrain biases and limits, sedaDNA can be used in parallel or even replace the more established macrofossils and pollen approaches as my results support the robustness and potential of sedaDNA to answer new palaeoecological questions such as plant diversity changes, loss and provide snapshots of entire ancient biota.
    Description / Table of Contents: Der vom Menschen verursachte Klimawandel wirkt sich auf die biologische Vielfalt der Erde und damit auf die Ökosysteme und ihre Leistungen aus. Die Ökosysteme in den hohen Breitengraden sind aufgrund der verstärkten Erwärmung an den Polen noch stärker betroffen als der Rest der nördlichen Hemisphäre. Dennoch ist es schwierig, die Dynamik von Ökosystemen in den hohen Breitengraden vorherzusagen, da die Wechselwirkungen zwischen abiotischen und biotischen Komponenten sehr komplex sind. Da die Vergangenheit der Schlüssel zur Zukunft ist, ist die Interpretation vergangener ökologischer Veränderungen möglich, um laufende Prozesse besser zu verstehen. Im Quartär durchlief das Pleistozän mehrere glaziale und interglaziale Phasen, welche die Ökosysteme der Vergangenheit beeinflussten. Während des letzten Glazials bedeckte die pleistozäne Steppentundra den größten Teil der unvergletscherten nördlichen Hemisphäre und verschwand parallel zum Aussterben der Megafauna am Übergang zum Holozän (vor etwa 11 700 Jahren). Der Ursprung des Rückgangs der Steppentundra ist nicht gut erforscht, und die Kenntnis über die Mechanismen, die zu den Veränderungen in den vergangenen Lebensgemeinschaften und Ökosystemen geführt haben, ist von hoher Priorität, da sie wahrscheinlich mit denen vergleichbar sind, die sich auf moderne Ökosysteme auswirken. Durch die Entnahme von See- oder Permafrostkernsedimenten kann die vergangene Artenvielfalt an den Übergängen zwischen Eis- und Zwischeneiszeiten untersucht werden. Sibirien und Beringia waren der Ursprung der Ausbreitung der Steppentundra, weshalb die Untersuchung dieses Gebiets hohe Priorität hat. Bis vor kurzem waren Makrofossilien und Pollen die gängigsten Methoden. Sie dienen der Rekonstruktion vergangener Veränderungen in der Zusammensetzung der Bevölkerung, haben aber ihre Grenzen und Schwächen. Seit Ende des 20. Jahrhunderts kann auch sedimentäre alte DNA (sedaDNA) untersucht werden. Mein Hauptziel war es, durch den Einsatz von sedaDNA-Ansätzen wissenschaftliche Beweise für Veränderungen in der Zusammensetzung und Vielfalt der Ökosysteme der nördlichen Hemisphäre am Übergang zwischen den quartären Eiszeiten und Zwischeneiszeiten zu liefern. In dieser Arbeit liefere ich Momentaufnahmen ganzer alter Ökosysteme und beschreibe die Veränderungen in der Zusammensetzung zwischen Quartärglazialen und Interglazialen und bestätige die Vegetationszusammensetzung sowie die räumlichen und zeitlichen Grenzen der pleistozänen Steppentundra. Ich stelle einen allgemeinen Verlust der Pflanzenvielfalt fest, wobei das Aussterben der Pflanzen parallel zum Aussterben der Megafauna verlief. Ich zeige auf, wie der Verlust der biotischen Widerstandsfähigkeit zum Zusammenbruch eines zuvor gut etablierten Systems führte, und diskutiere meine Ergebnisse im Hinblick auf den laufenden Klimawandel. Mit weiteren Arbeiten zur Eingrenzung von Verzerrungen und Grenzen kann sedaDNA parallel zu den etablierteren Makrofossilien- und Pollenansätzen verwendet werden oder diese sogar ersetzen, da meine Ergebnisse die Robustheit und das Potenzial von sedaDNA zur Beantwortung neuer paläoökologischer Fragen wie Veränderungen der Pflanzenvielfalt und -verluste belegen und Momentaufnahmen ganzer alter Biota liefern.
    Type of Medium: Dissertations
    Pages: vi, 217 Seiten , Illustrationen, Diagramme, Karten
    Language: English
    Note: Dissertation, Universität Potsdam, 2023 , TABLE OF CONTENTS Acknowledgements Summary Zusammenfassung 1 General introduction 1.1 A changing world 1.1.1 Global changes of anthropogenic origin 1.1.2 Amplified crisis in the high latitudes 1.2 The past is the key to the future 1.2.1 The Quaternary glacial and interglacial stages 1.2.2 The Beringia study case 1.3 Investigating past biodiversity 1.3.1 Traditional tools 1.3.2 Newest sedaDNA proxies 1.4 Motivation and aims of the thesis 1.5 Structure of the thesis 1.6 Author’s contributions 2 Manuscript I 2.1 Abstract 2.2 Introduction 2.3 Materials and Methods 2.3.1 Geographical settings 2.3.2 Fieldwork and subsampling 2.3.3 Core splicing and dating 2.3.4 Sediment-geochemical analyses 2.3.5 Pollen analysis 2.3.6 Molecular genetic preparation 2.3.7 Processing of sedaDNA data 2.3.8 Statistical analysis and visualization 2.4 Results 2.4.1 Age model 2.4.2 Sediment-geochemical core composition 2.4.3 Pollen stratigraphy 2.4.4 sedaDNA composition 2.4.5 Comparison between pollen and sedaDNA 2.4.6 Taxa richness investigation 2.5 Discussion 2.5.1 Proxy validation 2.5.2 Vegetation compositional changes in response to climate inferred from pollen and sedaDNA records 2.5.3 The steppe-tundra of the Late Pleistocene 2.5.4 The disrupted Pleistocene-Holocene transition 2.5.5 The boreal forest of the Holocene 2.5.6 Changes in vegetation richness through the Pleistocene/Holocene transition inferred from the sedaDNA record 2.6 Conclusion Data availability statement Funding References 3 Manuscript II 3.1 Abstract 3.2 Introduction 3.3 Material and Method 3.3.1 Site description and timeframe 3.3.2 Sampling, DNA extraction and PCR 3.3.3 Filtering and cleaning dataset 3.3.4 Identification of taxa – species signal 3.3.5 Resampling 3.3.6 Assessment of the species pool stability 3.3.7 Quantification of extinct and extirpated taxa 3.3.8 Characterisation of species and candidate species 3.4 Results 3.4.1 Changes in the composition and species pool at the Pleistocene - Holocene transition 3.4.2 Decrease in the regional plant species richness between the Pleistocene and the Holocene 3.4.3 Identification of loss taxa events 3.4.4 Characterisation of lost taxa 3.5 Discussion 3.5.1 Biotic and abiotic changes in the ecosystem - a cocktail for extinction 3.5.2 Identification and quantification of potential plant taxa loss 3.5.3 Characterisation of potential taxa loss 3.5.4 Limits of the method 3.5.5 Conclusions and perspectives Funding References 4 Manuscript III 4.1 Abstract 4.2 Introduction 4.3 Material & Methods 4.3.1 Fieldwork and subsampling 4.3.2 Chronology 4.3.3 Pollen analysis 4.3.4 Isolation of sedimentary ancient DNA 4.3.5 Metabarcoding approach 4.3.6 Shotgun approach 4.3.7 Bioinformatic processing 4.4 Results 4.4.1 General results of the three approaches: pollen, metabarcoding and shotgun sequencing 4.4.2 Plants (Viridiplantae) 4.4.3 Fungi 4.4.4 Mammals (Mammalia) 4.4.5 Birds (Aves) 4.4.6 Insects (Insecta) 4.4.7 Prokaryotes (Bacteria, Archaea) and Viruses 4.5 Discussion 4.5.1 Interglacial communities 4.5.2 Glacial communities 4.5.3 Potential and limitations of the sedaDNA shotgun approach applied to ancient permafrost sediments 4.6 Conclusions Data availability statement Funding References 5 Synthesis 5.1 Ecological changes between glacial and interglacial stages 5.1.1 Changes in the compositional structure 5.1.2 Loss of plant diversity 5.1.3 Potential drivers of change 5.2 High potential of sedaDNA for past biodiversity reconstruction 5.3 Conclusions and future perspectives Bibliography Appendices Appendix 1: Supplementary material for Manuscript I Appendix 2: Supplementary material for Manuscript II Appendix 3: Supplementary material for Manuscript III Appendix 4: Manuscript IV Eidesstattliche Erklärung
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  • 81
    Call number: AWI G2-23-95540
    In: World ocean review, 8
    Type of Medium: Series available for loan
    Pages: 243 Seiten , Illustrationen
    ISBN: 978-3-86648-733-8 , 9783866487338
    Series Statement: World ocean review 8
    Language: English
    Note: Inhaltsverzeichnis Vorwort Kapitel 1 Dringlichst gesucht – Wege aus der Klimakrise Alarmstufe Rot für Mensch und Natur Lösungen für das Treibhausgas-Problem? CONCLUSIO: Die Klimakrise kennt nur eine Lösung: Treibhausgasneutralität Kapitel 2 Die Rolle des Ozeans im Kohlenstoffkreislauf der Erde Wie der Ozean Kohlendioxid aufnimmt CONCLUSIO: Kohlenstoffspeicher Ozean: Riesig, effizient und in Gefahr 67 Kapitel 3 Das ungenutzte Klimaschutzpotenzial der Ökosysteme an Land Wälder, Wiesen und Böden als Kohlenstoffspeicher CONCLUSIO: Lösungen, die viel zu selten umgesetzt werden Kapitel 4 Marine CDR-Verfahren: Forschung unter Zeit- und Erwartungsdruck Ein Ozean der Möglichkeiten oder gefährlicher Hype? Kapitel 5 Mehr Kohlenstoffeinlagerung in Wiesen und Wäldern des Meeres? Blue Carbon: Ein Lösungsansatz mit doppeltem Nutzen CONCLUSIO: Küstenökosysteme: Marine Kohlenstoffsenke mit unverzichtbaren Zusatzleistungen Kapitel 6 Künstlicher Auftrieb: Die Idee von der Begrünung des Ozeans Eine Anschubhilfe für die biologische Kohlenstoffpumpe CONCLUSIO: Künstlicher Auftrieb – Prädikat: „nur bedingt nützlich“ Kapitel 7 Gezielte Eingriffe in die Meereschemie Alkalinitätserhöhung: Verfahren in den Kinderschuhen CONCLUSIO: Alkalinitätserhöhung – theoretisch verstanden, im Feld jedoch kaum getestet Kapitel 8 Kohlendioxid verpressen tief unter dem Meer Gasspeicherung in Sandsteinschichten und Basaltgestein CONCLUSIO: Kohlendioxidspeicherung unter dem Meer: Ein umstrittenes Verfahren im Aufwind Kapitel 9 Leitprinzipien und Regeln für einen Einsatz mariner CDR-Verfahren Wie regelt man eine verstärkte CO2-Aufnahme des Meeres? CONCLUSIO: Regulierung möglicher CDR-Einsätze: Gebraucht werden klare Strategien und Vorschriften Gesamt-Conclusio Abkürzungen Quellenverzeichnis Mitwirkende Index Partner und Danksagung Abbildungsverzeichnis Impressum .
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  • 82
    Call number: AWI A4-23-95497
    Description / Table of Contents: Extreme weather and climate events are one of the greatest dangers for present-day society. Therefore, it is important to provide reliable statements on what changes in extreme events can be expected along with future global climate change. However, the projected overall response to future climate change is generally a result of a complex interplay between individual physical mechanisms originated within the different climate subsystems. Hence, a profound understanding of these individual contributions is required in order to provide meaningful assessments of future changes in extreme events. One aspect of climate change is the recently observed phenomenon of Arctic Amplification and the related dramatic Arctic sea ice decline, which is expected to continue over the next decades. The question to what extent Arctic sea ice loss is able to affect atmospheric dynamics and extreme events over mid-latitudes has received a lot of attention over recent years and still remains a highly debated topic. In this respect, the objective of ...
    Type of Medium: Dissertations
    Pages: xi, 126 Seiten , Diagramme
    Language: English
    Note: Dissertation, Universität Potsdam, 2023 , CONTENTS 1 SCIENTIFIC BACKGROUND AND RESEARCH QUESTIONS 1.1 Extreme events and attribution 1.2 Arctic climate change and mid-latitude linkages 1.3 Research questions 2 FOUNDATIONS 2.1 Atmospheric basics 2.1.1 Governing equations 2.1.2 Zonal wind and temperature profiles 2.1.3 Atmospheric waves and instabilities 2.1.4 Large-scale variability patterns and blocking 2.2 Atmospheric circulation regimes 2.2.1 Dynamical concepts 2.2.2 Regime computation 2.2.3 Regime number 2.3 Arctic climate change 2.3.1 Recent trends in Arctic sea ice and temperatures 2.3.2 Surface fluxes and energy balance in Arctic regions 2.3.3 Polar amplification mechanisms 2.3.4 Arctic-mid-latitude linkages 2.4 Weather and climate extremes 2.4.1 Recent trends 2.4.2 Dynamical driver of temperature extremes 3 DATA AND METHODS 3.1 ERA5 reanalysis 3.2 Model experiments 3.2.1 The atmospheric general circulation model ECHAM6 3.2.2 Polar Amplification Intercomparison Project data 3.3 Methods 3.3.1 Statistical significance 3.3.2 Extreme definition 4 RESULTS AND DISCUSSION 4.1 Mean circulation in ERA5 and ECHAM6 experiments 4.1.1 Climatological mean states in ERA5 and the reference simulation 4.1.2 Climatological responses in ECHAM6 sensitivity experiments 4.2 Circulation regimes and sea ice-induced frequency changes 4.2.1 Regime structures in ERA5 and ECHAM6 experiments 4.2.2 Regime frequency changes in ERA 4.2.3 Regime frequency changes in ECHAM6 experiments 4.3 Changes in Northern Hemispheric temperature extremes induced by sea ice loss 4.3.1 Extreme occurrence frequency changes 4.3.2 Temperature return level changes 4.4 Links between circulation regimes and extremes over Europe 4.4.1 Winter temperature extremes 4.4.2 Summer heat extremes 4.4.3 Winter wind extremes 4.5 Decomposition of sea ice-induced frequency changes in European winter extremes 4.5.1 Midwinter cold extremes along a SCAN storyline 4.5.2 January warm extremes along a ATl- storyline 4.5.3 February warm extremes along a NAO+ storyline 4.5.4 Comparison with futSST 4.5.5 January wind extremes along a ATL- storyline 4.6 Circulation Analogue-based approach for summer season 4.6.1 ERA5 event definitions 4.6.2 Reference flows and analogues in ERA5 4.6.3 Circulation analogues in ECHAM6 experiments 4.6.4 Decomposition of sea ice-induced changes in European heat extremes 5 CONCLUSION 5.1 Summary 5.2 Final discussion and outlook Appendix A METHODS A.1 Principal Component Analysis A.2 𝑘-Means clustering A.2.1 Algorithm A.2.2 Computation of circulation regimes A.3 Taylor diagram A.4 Regression model for describing ERA5 regime frequency changes A.4.1 General setup A.4.2 Multinomial Logistic Regression A.4.3 Linear predictor A.5 Definition and calculation of return levels A.5.1 Block maxima approach and Generalized Extreme Value distribution A.5.2 Return level estimation A.6 Framework for conditional extreme event attribution Appendix B ADDITIONAL FIGURES B.1 Circulation regimes and sea ice-induced frequency changes B.2 Changes in Northern Hemispheric temperature extremes induced by sea ice loss B.3 Links between circulation regimes and extremes over Europe B.3.1 Conditioned vs. unconditioned ERA5 and wind extreme probabilities B.3.2 Wind and synoptic-scale activity anomalies B.4 Decomposition of sea ice-induced frequency changes in European winter extremes B.5 Circulation Analogue-based approach for summer season B.6 Miscellaneous B.6.1 Recent Arctic sea ice trends B.6.2 futSST forcing field B.6.3 Fluxes over sea ice and ocean surfaces in ECHAM6 BIBLIOGRAPHY
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  • 83
    Monograph available for loan
    Monograph available for loan
    New York, NY : Humana Press
    Call number: AWI Bio-24-95664
    Description / Table of Contents: This volume provides detailed protocols for the isolation, enumeration, characterization of diverse bacteriophages, including both small to jumbo bacteriophages, from soil, fecal, municipal wastewater, and from food niche samples. Chapters highlight the diversity of bacteriophages in different environments, quantifications using culture, molecular techniques, protocols for isolate, interaction of bacteriophage proteins with host cells, and how to use bacteriophages to transfer foreign genetic elements to bacterial strains. In addition to the above, chapters feature the application of bacteriophages/bacteriophage-derived products. Written in the highly successful Methods in Molecular Biology series format, chapters include introductions to their respective topics, lists of necessary materials and reagents, step-by-step, readily reproducible laboratory protocols, and tips (in the Notes section) on troubleshooting and avoiding known pitfalls. Authoritative and cutting-edge, Bacteriophages: Methods and Protocols aims to ensure successful results in further study of this vital field.
    Type of Medium: Monograph available for loan
    Pages: XVI, 431 Seiten , Illustrationen
    ISBN: 978-1-0716-3548-3 , 9781071635483
    ISSN: 1064-3745 , 1940-6029
    Series Statement: Methods in Molecular Biology 2738
    Language: English
    Note: Contents Preface Contributors PART I AN OVERVIEW OF THE DIVERSITY OF BACTERIOPHAGES 1 Structural and Genomic Diversity of Bacteriophages / Bert Ely, Jacob Lenski, and Tannaz Mohammadi 2 The Diversity of Bacteriophages in the Human Gut / Amanda Carroll-Portillo, Derek M. Lin, and Henry C. Lin 3 Breaking the Ice: A Review of Phages in Polar Ecosystems / Mara Elena Heinrichs, Gonçalo J. Piedade, Ovidiu Popa, Pacifica Sommers, Gareth Trubl, Julia Weissenbach, and Janina Rahlff 4 The Diversity of Bacteriophages in Hot Springs / Timothy J. Marks and Isabella R. Rowland PART II ISOLATION OF BACTERIOPHAGES 5 Isolation of Bacteriophages from Soil Samples in a Poorly Equipped Field Laboratory in Kruger National Park / Ayesha Hassim and Kgaugelo Edward Lekota 6 Purification and Up-Concentration of Bacteriophages and Viruses from Fecal Samples / Frej Larsen, Rasmus Riemer Jakobsen, Xiaotian Mao, Josue Castro-Mejia, Ling Deng, and Dennis S. Nielsen 7 Isolation of Enterococcus Bacteriophages from Municipal Wastewater Samples Using an Enrichment Step / Cory Schwarz and Jacques Mathieu 8 Phage DNA Extraction, Genome Assembly, and Genome Closure / Justin Boeckman, Mei Liu, Jolene Ramsey, and Jason Gill PART III ENUMERATION OF BACTERIOPHAGES 9 Enumeration of Bacteriophages by Plaque Assay / Diana Elizabeth Waturangi 10 Detection and Quantification of Bacteriophages in Wastewater Samples by Culture and Molecular Methods/ Laura Sala-Comorera, Maite Muniesa, and Lorena Rodríguez-Rubio 11 Flow Virometry: A Fluorescence-Based Approach to Enumerate Bacteriophages in Liquid Samples / Elena A. Dlusskaya and Rafik Dey 12 A Metagenomics Approach to Enumerate Bacteriophages in a Food Niche / Kelsey White, Giovanni Eraclio, Gabriele Andrea Lugli, Marco Ventura, Jennifer Mahony, Fabio Dal Bello, and Douwe van Sinderen PART IV CHARACTERIZATION OF BACTERIOPHAGES 13 Bioinformatic Analysis of Staphylococcus Phages: A Key Step for Safe Cocktail Development / Soledad Telma Carrasco and He´ctor Ricardo Morbidoni 14 Use of Localized Reconstruction to Visualize the Shigella Phage Sf6 Tail Apparatus / Chun-Feng David Hou, Fenglin Li, Stephano Iglesias, and Gino Cingolani 15 Bacteriophage–Host Interactions and Coevolution / Diana M. Álvarez-Espejo, Dácil Rivera, and Andrea I. Moreno-Switt 16 Unraveling Physical Interactions of Clostridioides difficile with Phage and Phage-Derived Proteins Using In Vitro and Whole-Cell Assays / Wichuda Phothichaisri, Tanaporn Phetruen, Surang Chankhamhaengdecha, Tavan Janvilisri, Puey Ounjai, Robert P. Fagan, and Sittinan Chanarat 17 Phage Transduction of Staphylococcus aureus / Melissa-Jane Chu Yuan Kee and John Chen PART V APPLICATION OF BACTERIOPHAGES AND BACTERIOPHAGE-DERIVED COMPONENTS 18 The Next Generation of Drug Delivery: Harnessing the Power of Bacteriophages / Alaa A. A. Aljabali, Mohammad B. M. Aljbaly, Mohammad A. Obeid, Seyed Hossein Shahcheraghi, and Murtaza M. Tambuwala 19 Construction of Nonnatural Cysteine-Cross-Linked Phage Libraries / Brittney Chau, Kristi Liivak, and Jianmin Gao 20 Application of Deep Sequencing in Phage Display / Vincent Van Deuren, Sander Plessers, Rob Lavigne, and Johan Robben 21 The Application of Bacteriophage and Photoacoustic Flow Cytometry in Bacterial Identification / Robert H. Edgar, Anie-Pier Samson, and John A. Viator 22 Propagation, Purification, and Characterization of Bacteriophages for Phage Therapy / Katarzyna Kosznik-Kwaśnicka, Gracja Topka, Jagoda Mantej, Łukasz Grabowski, Agnieszka Necel, Grzegorz Węgrzyn, and Alicja Węgrzyn 23 Overcoming Bacteriophage Resistance in Phage Therapy / Elina Laanto 24 Bacteriophage Virus-Like Particles: Platforms for Vaccine Design / Ebenezer Tumban Index
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  • 84
    Call number: AWI Bio-24-95742
    Description / Table of Contents: The arctic is warming 2 – 4 times faster than the global average, resulting in a strong feedback on northern ecosystems such as boreal forests, which cover a vast area of the high northern latitudes. With ongoing global warming, the treeline subsequently migrates northwards into tundra areas. The consequences of turning ecosystems are complex: on the one hand, boreal forests are storing large amounts of global terrestrial carbon and act as a carbon sink, dragging carbon dioxide out of the global carbon cycle, suggesting an enhanced carbon uptake with increased tree cover. On the other hand, with the establishment of trees, the albedo effect of tundra decreases, leading to enhanced soil warming. Meanwhile, permafrost thaws, releasing large amounts of previously stored carbon into the atmosphere. So far, mainly vegetation dynamics have been assessed when studying the impact of warming onto ecosystems. Most land plants are living in close symbiosis with bacterial and fungal communities, sustaining their growth in nutrient poor habitats. However, the impact of climate change on these subsoil communities alongside changing vegetation cover remains poorly understood. Therefore, a better understanding of soil community dynamics on multi millennial timescales is inevitable when addressing the development of entire ecosystems. Unravelling long-term cross-kingdom dependencies between plant, fungi, and bacteria is not only a milestone for the assessment of warming on boreal ecosystems. On top, it also is the basis for agriculture strategies to sustain society with sufficient food in a future warming world. The first objective of this thesis was to assess ancient DNA as a proxy for reconstructing the soil microbiome (Manuscripts I, II, III, IV). Research findings across these projects enable a comprehensive new insight into the relationships of soil microorganisms to the surrounding vegetation. First, this was achieved by establishing (Manuscript I) and applying (Manuscript II) a primer pair for the selective amplification of ancient fungal DNA from lake sediment samples with the metabarcoding approach. To assess fungal and plant co-variation, the selected primer combination (ITS67, 5.8S) amplifying the ITS1 region was applied on samples from five boreal and arctic lakes. The obtained data showed that the establishment of fungal communities is impacted by warming as the functional ecological groups are shifting. Yeast and saprotroph dominance during the Late Glacial declined with warming, while the abundance of mycorrhizae and parasites increased with warming. The overall species richness was also alternating. The results were compared to shotgun sequencing data reconstructing fungi and bacteria (Manuscripts III, IV), yielding overall comparable results to the metabarcoding approach. Nonetheless, the comparison also pointed out a bias in the metabarcoding, potentially due to varying ITS lengths or copy numbers per genome. The second objective was to trace fungus-plant interaction changes over time (Manuscripts II, III). To address this, metabarcoding targeting the ITS1 region for fungi and the chloroplast P6 loop for plants for the selective DNA amplification was applied (Manuscript II). Further, shotgun sequencing data was compared to the metabarcoding results (Manuscript III). Overall, the results between the metabarcoding and the shotgun approaches were comparable, though a bias in the metabarcoding was assumed. We demonstrated that fungal shifts were coinciding with changes in the vegetation. Yeast and lichen were mainly dominant during the Late Glacial with tundra vegetation, while warming in the Holocene lead to the expansion of boreal forests with increasing mycorrhizae and parasite abundance. Aside, we highlighted that Pinaceae establishment is dependent on mycorrhizal fungi such as Suillineae, Inocybaceae, or Hyaloscypha species also on long-term scales. The third objective of the thesis was to assess soil community development on a temporal gradient (Manuscripts III, IV). Shotgun sequencing was applied on sediment samples from the northern Siberian lake Lama and the soil microbial community dynamics compared to ecosystem turnover. Alongside, podzolization processes from basaltic bedrock were recovered (Manuscript III). Additionally, the recovered soil microbiome was compared to shotgun data from granite and sandstone catchments (Manuscript IV, Appendix). We assessed if the establishment of the soil microbiome is dependent on the plant taxon and as such comparable between multiple geographic locations or if the community establishment is driven by abiotic soil properties and as such the bedrock area. We showed that the development of soil communities is to a great extent driven by the vegetation changes and temperature variation, while time only plays a minor role. The analyses showed general ecological similarities especially between the granite and basalt locations, while the microbiome on species-level was rather site-specific. A greater number of correlated soil taxa was detected for deep-rooting boreal taxa in comparison to grasses with shallower roots. Additionally, differences between herbaceous taxa of the late Glacial compared to taxa of the Holocene were revealed. With this thesis, I demonstrate the necessity to investigate subsoil community dynamics on millennial time scales as it enables further understanding of long-term ecosystem as well as soil development processes and such plant establishment. Further, I trace long-term processes leading to podzolization which supports the development of applied carbon capture strategies under future global warming.
    Type of Medium: Dissertations
    Pages: xii, 198 Seiten , Illustrationen, Diagramme
    Language: English
    Note: Dissertation, Universität Potsdam, 2024 , Table of Contents Summary Deutsche Zusammenfassung 1 Introduction 1.1 Arctic ecosystems under global warming 1.2 The plant-associated microbiome 1.3 Drivers of soil development 1.4 Ancient DNA to unravel past ecosystems 1.4.1 Lake sediments as archives of past community changes 1.4.2 Metabarcoding for targeting specific communities 1.4.3 Shotgun sequencing for broader overview 1.5 Thesis objective 1.6 Thesis outline and author contributions 2 Manuscript I 2.1 Abstract 2.2 Introduction 2.3 Materials and Methods 2.3.1 Primer design and evaluation In silico analyses Evaluation of lake sediment core DNA for analyses of fungal paleoecology 2.4 Results Primer design and evaluation Evaluation of lake sediment core DNA for fungal paleoecology 2.4.1 Taxonomic resolution across the cores 2.4.2 Comprehensiveness: Rarefaction and accumulation curves 2.4.3 Amplicon length and GC content to assess bias through degradation 2.4.4 General taxonomic composition of fungi in Siberian lake sediment cores Diversity of fungal paleocommunities from lake CH12 2.5 Discussion 2.5.1 Preservation biases and potential contamination 2.5.2 Characteristics of the optimized sedaDNA ITS1 metabarcoding assay 2.5.3 Potential of lake sediment fungal DNA for paleoecology 2.6 Author contributions 2.7 Acknowledgements 2.8 Conflict of interest 2.9 References 3 Manuscript II 3.1 Abstract 3.2 Introduction 3.3 Geographic setting and study sites 3.4 Materials and Methods 3.4.1 Sampling 3.4.2 DNA extraction and amplification 3.4.3 Bioinformatic analysis 3.4.4 Assessment of negative controls and contamination 3.4.5 Statistical analysis and visualization 3.5 Results 3.5.1 Fungi: sedaDNA sequencing results and overall patterns of alpha diversity and taxonomic composition 3.5.2 Vegetation: sedaDNA sequencing results and overall patterns of alpha diversity and taxonomic composition 3.5.3 Site-specific plant-fungus covariation 3.5.3.1 Fungus and plant covariation in arctic Siberia from MIS3 to the Holocene 3.5.3.2 Quantitative relationships between fungi and plant richness and composition 3.6 Discussion 3.6.1 Fungus and plant diversity along a spatiotemporal gradient in Siberia 3.6.2 Changes in ecosystem functioning over a spatiotemporal gradient 3.6.3 Implications of our results for ecosystem functioning and future research avenues 3.7 Conclusions Funding Availability of data and material Author contribution Declaration of competing interest Acknowledgements 3.8 References 4 Manuscript III 4.1 Abstract 4.2 Introduction 4.3 Results and Discussion 4.3.1 Compositional changes of plants, fungi, and bacteria in ancient metagenomic datasets 4.3.2 Long-term soil development: a trajectory or environmentally driven processes? 4.3.3 Bioweathering supported by lichens and mycorrhiza 4.3.4 Turnover in carbon, nitrogen, and sulphur cycling 4.3.5 Tracing podzolization 4.4 Implications and conclusions 4.5 Material and methods 4.5.1 Geographical setting and study site 4.5.2 X-ray fluorescence scanning of the sediment core 4.5.3 Core sub-sampling 4.5.4 DNA extraction 4.5.5 Single stranded DNA library build 4.5.6 Bioinformatic pipeline for the analysis of the sequencing results 4.5.7 Data analysis 4.5.8 Analysis of the ancient patterns 4.5.9 Statistical analysis of the dataset Acknowledgements 4.6 References Declarations 5 Discussion and synthesis 5.1 Long-term rhizosphere establishment in tundra and taiga areas 5.1.1 SedaDNA as a proxy for soil microbiome 5.1.1.1 Fungal DNA metabarcoding 5.1.1.2 Targeting soil communities with shotgun sequencing 5.1.1.3 Comparison between metabarcoding and shotgun sequencing for the soil microbiome 5.1.2 Fungi-vegetation interaction changes over time 5.1.3 Soil development on a temporal gradient 5.2 Conclusion and future perspectives 6 References 7 Appendix 7.1 Appendix to manuscript I 7.2 Appendix to manuscript II 7.3 Appendix to manuscript III 7.4 Manuscript IV 7.4.1 Abstract 7.4.2 Introduction 7.4.3 Geographical setting and study sites 7.4.4 Material & Methods 7.4.4.1 Sub-sampling of the sediment cores 7.4.4.2 DNA extraction 7.4.4.3 Single stranded DNA library built 7.4.4.4 Bioinformatic pipeline for the analysis of the sequencing data 7.4.4.5 Data analysis 7.4.4.6 Statistical analysis of the datasets 7.4.5 Results 7.4.5.1 Compositional changes of representative plant taxa alongside dynamics in fungal ecologies and bacterial element cycling in ancient metagenomic datasets 7.4.5.2 Impact of abiotic and biotic drivers on soil establishment across geographical locations 7.4.5.3 Relative positive correlations of functional soil taxa with plants across the locations 7.4.5.4 Assessment of the plant taxon-specific microbiome across the locations 7.4.6 Discussion 7.4.6.1 Site-specific soil development 7.4.6.2 Differences in the bedrock 7.4.6.3 Correlation between the lake biota 7.4.6.3.1 General Trends in positively correlated rhizosphere taxa 7.4.6.3.2 Plant taxa specific microbiome 7.4.7 Implications and future directions 7.4.8 References 7.4.9 Supplement to manuscript IV Acknowledgements Eidesstattliche Erklärung Damage pattern analysis – Auflagen Doktorarbeit Summary Main References
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  • 85
    Call number: AWI Bio-24-95736
    Description / Table of Contents: Moss-microbe associations are often characterised by syntrophic interactions between the microorganisms and their hosts, but the structure of the microbial consortia and their role in peatland development remain unknown. In order to study microbial communities of dominant peatland mosses, Sphagnum and brown mosses, and the respective environmental drivers, four study sites representing different successional stages of natural northern peatlands were chosen on a large geographical scale: two brown moss-dominated, circumneutral peatlands from the Arctic and two Sphagnum-dominated, acidic peat bogs from subarctic and temperate zones. The family Acetobacteraceae represented the dominant bacterial taxon of Sphagnum mosses from various geographical origins and displayed an integral part of the moss core community. This core community was shared among all investigated bryophytes and consisted of few but highly abundant prokaryotes, of which many appear as endophytes of Sphagnum mosses. Moreover, brown mosses and Sphagnum mosses represent habitats for archaea which were not studied in association with peatland mosses so far. Euryarchaeota that are capable of methane production (methanogens) displayed the majority of the moss-associated archaeal communities. Moss-associated methanogenesis was detected for the first time, but it was mostly negligible under laboratory conditions. Contrarily, substantial moss-associated methane oxidation was measured on both, brown mosses and Sphagnum mosses, supporting that methanotrophic bacteria as part of the moss microbiome may contribute to the reduction of methane emissions from pristine and rewetted peatlands of the northern hemisphere. Among the investigated abiotic and biotic environmental parameters, the peatland type and the host moss taxon were identified to have a major impact on the structure of moss-associated bacterial communities, contrarily to archaeal communities whose structures were similar among the investigated bryophytes. For the first time it was shown that different bog development stages harbour distinct bacterial communities, while at the same time a small core community is shared among all investigated bryophytes independent of geography and peatland type. The present thesis displays the first large-scale, systematic assessment of bacterial and archaeal communities associated both with brown mosses and Sphagnum mosses. It suggests that some host-specific moss taxa have the potential to play a key role in host moss establishment and peatland development.
    Description / Table of Contents: Während die Beziehungen zwischen Moosen und den mit ihnen assoziierten Mikroorganismen oft durch syntrophische Wechselwirkungen charakterisiert sind, ist die Struktur der Moos-assoziierten mikrobiellen Gemeinschaften sowie deren Rolle bei der Entstehung von Mooren weitgehend unbekannt. Die vorliegende Arbeit befasst sich mit mikrobiellen Gemeinschaften, die mit Moosen nördlicher, naturnaher Moore assoziiert sind, sowie mit den Umweltfaktoren, die sie beeinflussen. Entlang eines groß angelegten geographischen Gradienten, der von der Hocharktis bis zur gemäßigten Klimazone reicht, wurden vier naturbelassene Moore als Probenstandorte ausgesucht, die stellvertretend für verschiedene Stadien der Moorentwicklung stehen: zwei Braunmoos-dominierte Niedermoore mit nahezu neutralem pH-Wert sowie zwei Sphagnum-dominierte Torfmoore mit saurem pH-Wert. Die Ergebnisse der vorliegenden Arbeit machen deutlich, dass die zu den Bakterien zählenden Acetobacteraceae das vorherrschende mikrobielle Taxon der Sphagnum-Moose gleich welchen geographischen Ursprungs darstellen und insbesondere innerhalb des Wirtsmoosgewebes dominieren. Gleichzeitig gehörten die Acetobacteraceae zum wesentlichen Bestandteil der mikrobiellen Kerngemeinschaft aller untersuchten Moose, die sich aus einigen wenigen Arten, dafür zahlreich vorkommenden Prokaryoten zusammensetzt. Die vorliegende Arbeit zeigt zudem erstmals, dass sowohl Braunmoose als auch Torfmoose ein Habitat für Archaeen darstellen. Die Mehrheit der Moos-assoziierten Archaeen gehörte dabei zu den methanbildenden Gruppen, wenngleich die metabolischen Aktivitätsraten unter Laborbedingungen meistens kaum messbar waren. Im Gegensatz hierzu konnte die Bakterien-vermittelte Methanoxidation sowohl an Braunmoosen als auch an Sphagnum-Moosen gemessen werden. Dies zeigt eindrucksvoll, dass Moos-assoziierte Bakterien potenziell zur Minderung von Methanemissionen aus nördlichen, aber auch wiedervernässten Mooren beitragen können. Ein weiteres wichtiges Resultat der vorliegenden Arbeit ist die Bedeutung des Moortyps (Niedermoor oder Torfmoor), aber auch der Wirtsmoosart selbst für die Struktur der Moos-assoziierten Bakteriengemeinschaften, während die archaeellen Gemeinschaftsstrukturen weder vom Moortyp noch von der Wirtsmoosart beeinflusst wurden und sich insgesamt deutlich ähnlicher waren als die der Bakterien. Darüber hinaus konnte erstmalig gezeigt werden, dass sich die bakteriellen Gemeinschaften innerhalb der unterschiedlichen Moorsukzessionsstadien zwar ganz erheblich voneinander unterscheiden, ein kleiner Teil der Bakterien dennoch Kerngemeinschaften bilden, die mit allen untersuchten Moosarten assoziiert waren. Bei der hier präsentierten Arbeit handelt es sich um die erste systematische Studie, die sich auf einer großen geographischen Skala mit den bakteriellen und archaeellen Gemeinschaften von Braunmoosen und Torfmoosen aus naturbelassenen nördlichen Mooren befasst. Die vorliegenden Ergebnisse machen deutlich, dass die untersuchten Moose ein ganz spezifisches mikrobielles Konsortium beherbergen, welches mutmaßlich eine Schlüsselrolle bei der Etablierung der Wirtspflanzen am Anfang der Moorentwicklung spielt und darüber hinaus das Potential hat, die charakteristischen Eigenschaften von Mooren sowie deren weitere Entwicklung zu prägen.
    Type of Medium: Dissertations
    Pages: XX, 139, liv Seiten , Illustrationen, Diagramme
    Language: English
    Note: Dissertation, Universität Potsdam, 2024 , Content Preface Acknowledgements Summary Zusammenfassung Abbreviations 1. Introduction 1.1. Peatlands 1.1.1. Peatland development and peat bog succession 1.1.2. Characteristic peatlands of the northern hemisphere 1.1.3. Anthropogenic threats of northern peatlands 1.1.4. Peat bog restoration 1.2. Peatland bryophytes 1.2.1. Brown mosses 1.2.2. Sphagnum mosses 1.3. Moss microbiota 1.3.1. Moss-associated bacteria 1.3.2. Moss-associated archaea 1.3.3. Endophytic prokaryotic communities 1.4. Biotic and abiotic influences on moss-associated microorganisms 1.5. Objectives 1.6. Study sites 1.6.1. High Arctic peatlands of Svalbard (SV) 1.6.2. Polygonal Tundra of Samoylov (SA) 1.6.3. Palsa Bogs of Neiden (NEI) 1.6.4. Kettle Bog Peatlands of Mueritz National Park (MUE) 2. Material and Methods 2.1. Sampling scheme overview 2.2. Sampling of pore water 2.3. Sampling of moss plantlets 2.4. Analysis of pore water chemistry 2.5. Cell wall analysis 2.5.1. Cation exchange capacity (CEC) 2.5.2. Holocellulose (HC) 2.5.3. Lignin and Lignin-like polymers (LLP) 2.5.4. Bulk moss litter analysis 2.6. Moss surface sterilisation and separation of putative epiphytic and endophytic microbial communities 2.7. DNA extraction and sequencing 2.8. Sequence analyses and bioinformatics 2.9. Statistical analyses 2.10. Potential methane production and oxidation assays 2.10.1. Surface sterilisation prior to activity tests 2.10.2. Methane production 2.10.3. Methane oxidation 3. Results 3.1. Peatland bulk and pore water characteristics 3.2. Diversity and structure of natural peatland microbial communities 3.3. Environmental drivers of moss-associated microbial communities 3.4. Microbial taxa associated with brown mosses and Sphagnum mosses 3.4.1. Moss-associated bacteria 3.4.2. Moss-associated archaea 3.4.3. Bacterial and archaeal core communities 3.4.4. Acetobacteraceae as dominant taxon of the bacterial core community 3.5. Sphagnum bacteriomes of disturbed, rewetted and pristine temperate kettle bog 3.6. Potential moss-associated methane production and methane oxidation rates 3.6.1. Moss-associated methane production 3.6.2. Moss-associated methane oxidation 4. Discussion 4.1. Environmental influences on moss-associated bacterial communities 4.2. Moss-associated archaeal communities and their environmental drivers 4.3. Distinct patterns of endophytic bacteria 4.4. The core microbiota and their possible role for peatland succession 4.5. The potential role of Acetobacteraceae for Sphagnum host mosses and bog ecosystems 4.6. Moss-associated microbial communities of the methane cycle and their potential metabolic activity 4.7. Diversity and structure of Sphagnum bacteriomes from pristine, disturbed and rewetted kettle bogs 5. Conclusion 6. Critical remarks and outlook 6.1. Critical remarks 6.2. Outlook Bibliography Supplementary
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  • 86
    Call number: AWI G5-23-95172
    Description / Table of Contents: Throughout the last ~3 million years, the Earth's climate system was characterised by cycles of glacial and interglacial periods. The current warm period, the Holocene, is comparably stable and stands out from this long-term cyclicality. However, since the industrial revolution, the climate has been increasingly affected by a human-induced increase in greenhouse gas concentrations. While instrumental observations are used to describe changes over the past ~200 years, indirect observations via proxy data are the main source of information beyond this instrumental era. These data are indicators of past climatic conditions, stored in palaeoclimate archives around the Earth. The proxy signal is affected by processes independent of the prevailing climatic conditions. In particular, for sedimentary archives such as marine sediments and polar ice sheets, material may be redistributed during or after the initial deposition and subsequent formation of the archive. This leads to noise in the records challenging reliable reconstructions on local or short time scales. This dissertation characterises the initial deposition of the climatic signal and quantifies the resulting archive-internal heterogeneity and its influence on the observed proxy signal to improve the representativity and interpretation of climate reconstructions from marine sediments and ice cores. To this end, the horizontal and vertical variation in radiocarbon content of a box-core from the South China Sea is investigated. The three-dimensional resolution is used to quantify the true uncertainty in radiocarbon age estimates from planktonic foraminifera with an extensive sampling scheme, including different sample volumes and replicated measurements of batches of small and large numbers of specimen. An assessment on the variability stemming from sediment mixing by benthic organisms reveals strong internal heterogeneity. Hence, sediment mixing leads to substantial time uncertainty of proxy-based reconstructions with error terms two to five times larger than previously assumed. A second three-dimensional analysis of the upper snowpack provides insights into the heterogeneous signal deposition and imprint in snow and firn. A new study design which combines a structure-from-motion photogrammetry approach with two-dimensional isotopic data is performed at a study site in the accumulation zone of the Greenland Ice Sheet. The photogrammetry method reveals an intermittent character of snowfall, a layer-wise snow deposition with substantial contributions by wind-driven erosion and redistribution to the final spatially variable accumulation and illustrated the evolution of stratigraphic noise at the surface. The isotopic data show the preservation of stratigraphic noise within the upper firn column, leading to a spatially variable climate signal imprint and heterogeneous layer thicknesses. Additional post-depositional modifications due to snow-air exchange are also investigated, but without a conclusive quantification of the contribution to the final isotopic signature. Finally, this characterisation and quantification of the complex signal formation in marine sediments and polar ice contributes to a better understanding of the signal content in proxy data which is needed to assess the natural climate variability during the Holocene.
    Type of Medium: Dissertations
    Pages: xx, 167 Seiten : Illustrationen, Diagramme
    Language: English
    Note: Dissertation, Universität Potsdam, 2023 (publikationsbasierte Dissertation) , CONTENTS 1 Introduction 1.1 Introduction to climate reconstructions 1.1.1 Radiocarbon as a tracer of time 1.1.2 Environmental information stored in snow 1.2 Challenges of climate reconstructions 1.2.1 The particle flux 1.2.2 Modifications after the initial deposition 1.2.3 Sampling and measurement uncertainty 1.3 Objectives and overview of the thesis 1.4 Author contributions to the Manuscripts 2 Age-heterogeneity in marine sediments revealed by three-dimensional high-resolution radio-carbon measurements 2.1 Introduction 2.2 Methods 2.2.1 Study approach 2.2.2 Core setup and sampling 2.2.3 Estimation of the sediment accumulation rate 2.2.4 Estimation of the sediment mixing strength 2.2.5 Estimation of the net sediment displacement 2.2.6 Visual assessment of mixing 2.3 Results 2.3.1 Radiocarbon measurements 2.3.2 Sediment accumulation rate 2.3.3 Sediment mixing estimates 2.3.4 Spatial structure of sediment mixing 2.3.5 Components of age uncertainty 2.4 Discussion 2.4.1 Spatial scale of sediment heterogeneity 2.4.2 Potential implications for palaeo-reconstructions 2.4.3 Suggested 14C measurement strategy 2.5 Conclusions 2.6 Supplementary Material 2.6.1 Supplementary figures and tables 2.6.2 Supplementary table 3 Local-scale deposition of surface snow on the Greenland ice sheet 3.1 Introduction 3.2 Data and methods 3.2.1 Study site 3.2.2 SfM photogrammetry 3.2.3 Additional snow height and snowfall data 3.2.4 Estimation of surface roughness 3.3 Results 3.3.1 Relative snow heights from DEMs 3.3.2 Temporal snow height evolution 3.3.3 Day-to-day variations of snowfall 3.3.4 Changes in surface roughness 3.3.5 Implied internal structure of the snowpack 3.4 Discussion 3.4.1 Changes of surface structures 3.4.2 Implications for proxy data 3.4.3 Implications for snow accumulation 3.4.4 SfM as an efficient monitoring tool 3.5 Conclusions 3.6 Appendix 3.6.1 Additional information 3.6.2 Accuracy estimates and validation 3.6.3 Validation 3.6.4 Overall snow height evolution 3.6.5 Surface roughness 4 A snapshot on the buildup of the stable water isotopic signal in the upper snowpack at east-grip, Geenland ice sheet 4.1 Introduction 4.2 Methods and data 4.2.1 Study site 4.2.2 DEM generation 4.2.3 Isotope measurements 4.2.4 Simulation of the snowpack layering 4.2.5 Expected uncertainty 4.3 Results 4.3.1 Snow height evolution 4.3.2 Mean isotopic records 4.3.3 Combining isotopic data with snow height information 4.3.4 Observed vs. simulated composition 4.3.5 Changes in the isotope signal over time 4.4 Discussion 4.4.1 Evolution of the snow surface 4.4.2 Two-dimensional view of isotopes in snow 4.4.3 Buildup of the snowpack isotopic signal 4.5 Conclusion 5 General discussion and conclusions 5.1 Heterogeneity in sedimentary archives 5.1.1 Quantifying archive-internal heterogeneity 5.1.2 Relation between signal and heterogeneity 5.2 Methods to improve climate reconstructions 5.3 Implications for climate reconstructions 5.4 Concluding remarks Bibliography A the role of sublimation as a driver of climate signals in the water isotope content of surface snow: laboratory and field experimental results A.1 Introduction A.2 Methods A.2.1 Laboratory experimental methods A.2.2 Field experimental methods A.3 Results A.3.1 Laboratory experiments A.3.2 Field experiments A.4 Discussion A.5 Conclusions B Atmosphere-snow exchange explains surface snow isotope variability Acknowledgments Eidesstattliche Erklärung
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  • 87
    Call number: AWI A5-24-95744
    Description / Table of Contents: The Arctic is the hot spot of the ongoing, global climate change. Over the last decades, near-surface temperatures in the Arctic have been rising almost four times faster than on global average. This amplified warming of the Arctic and the associated rapid changes of its environment are largely influenced by interactions between individual components of the Arctic climate system. On daily to weekly time scales, storms can have major impacts on the Arctic sea-ice cover and are thus an important part of these interactions within the Arctic climate. The sea-ice impacts of storms are related to high wind speeds, which enhance the drift and deformation of sea ice, as well as to changes in the surface energy budget in association with air mass advection, which impact the seasonal sea-ice growth and melt. The occurrence of storms in the Arctic is typically associated with the passage of transient cyclones. Even though the above described mechanisms how storms/cyclones impact the Arctic sea ice are in principal known, there is a lack of statistical quantification of these effects. In accordance with that, the overarching objective of this thesis is to statistically quantify cyclone impacts on sea-ice concentration (SIC) in the Atlantic Arctic Ocean over the last four decades. In order to further advance the understanding of the related mechanisms, an additional objective is to separate dynamic and thermodynamic cyclone impacts on sea ice and assess their relative importance. Finally, this thesis aims to quantify recent changes in cyclone impacts on SIC. These research objectives are tackled utilizing various data sets, including atmospheric and oceanic reanalysis data as well as a coupled model simulation and a cyclone tracking algorithm. Results from this thesis demonstrate that cyclones are significantly impacting SIC in the Atlantic Arctic Ocean from autumn to spring, while there are mostly no significant impacts in summer. The strength and the sign (SIC decreasing or SIC increasing) of the cyclone impacts strongly depends on the considered daily time scale and the region of the Atlantic Arctic Ocean. Specifically, an initial decrease in SIC (day -3 to day 0 relative to the cyclone) is found in the Greenland, Barents and Kara Seas, while SIC increases following cyclones (day 0 to day 5 relative to the cyclone) are mostly limited to the Barents and Kara Seas. For the cold season, this results in a pronounced regional difference between overall (day -3 to day 5 relative to the cyclone) SIC-decreasing cyclone impacts in the Greenland Sea and overall SIC-increasing cyclone impacts in the Barents and Kara Seas. A cyclone case study based on a coupled model simulation indicates that both dynamic and thermodynamic mechanisms contribute to cyclone impacts on sea ice in winter. A typical pattern consisting of an initial dominance of dynamic sea-ice changes followed by enhanced thermodynamic ice growth after the cyclone passage was found. This enhanced ice growth after the cyclone passage most likely also explains the (statistical) overall SIC-increasing effects of cyclones in the Barents and Kara Seas in the cold season. Significant changes in cyclone impacts on SIC over the last four decades have emerged throughout the year. These recent changes are strongly varying from region to region and month to month. The strongest trends in cyclone impacts on SIC are found in autumn in the Barents and Kara Seas. Here, the magnitude of destructive cyclone impacts on SIC has approximately doubled over the last four decades. The SIC-increasing effects following the cyclone passage have particularly weakened in the Barents Sea in autumn. As a consequence, previously existing overall SIC-increasing cyclone impacts in this region in autumn have recently disappeared. Generally, results from this thesis show that changes in the state of the sea-ice cover (decrease in mean sea-ice concentration and thickness) and near-surface air temperature are most important for changed cyclone impacts on SIC, while changes in cyclone properties (i.e. intensity) do not play a significant role.
    Type of Medium: Dissertations
    Pages: VIII, 131 Seiten , Illustrationen, Diagramme
    Language: English
    Note: Dissertation, Universität Potsdam, 2024 , Contents 1 Introduction 1.1 The Arctic sea-ice cover 1.1.1 Sea ice in the coupled Arctic climate system 1.1.2 Recent changes of the Arctic sea ice 1.2 The atmosphere as driver of sea-ice variability 1.2.1 Large-scale circulation patterns 1.2.2 Role of cyclones 1.3 Thesis structure and research questions 2 Theory and methods 2.1 Synoptic cyclones 2.1.1 Related fundamentals of atmospheric dynamics 2.1.2 Cyclone activity in the Arctic 2.2 Cyclone tracking and cyclone occurrence mask 2.3 Dynamic and thermodynamic sea-ice variability related to cyclones 3 New insights into cyclone impacts on sea ice in the Atlantic sector of the Arctic Ocean in winter 3.1 Abstract 3.2 Introduction 3.3 Data and methods 3.3.1 Database and cyclone identification 3.3.2 Quantification of cyclone impacts on SIC 3.4 Cyclone impacts on SIC 3.4.1 Effects of different time scales and regions 3.4.2 Effects of SIC conditions and cyclone depth 3.4.3 Spatial variability of SIC response to cyclones 3.4.4 Relation to near-surface wind and surface energy budget 3.5 Signature of ’New Arctic’ conditions 3.6 Conclusions 3.7 Supplementary material 4 Impact of three intense winter cyclones on the sea ice cover in the Barents Sea: A case study with a coupled regional climate model 4.1 Abstract 4.2 Introduction 4.3 Data and methods 4.3.1 HIRHAM–NAOSIM simulation 4.3.2 Supplementary evaluation data 4.3.3 Dynamic and thermodynamic contributions to sea-ice changes 4.4 Results 4.4.1 Cyclone cases 4.4.2 Cyclone impacts on SEB 4.4.3 Cyclone impacts on sea-ice concentration (SIC) 4.4.4 Cyclone impacts on sea-ice thickness (SIT) 4.4.5 Context to other cyclone cases during the MOSAiC winter 4.5 Discussion and conclusions 4.6 Supplementary material 5 Cyclone impacts on sea ice concentration in the Atlantic Arctic Ocean: Annual cycle and recent changes 5.1 Abstract 5.2 Introduction 5.3 Data and methods 5.4 Changes in cyclones and traversed sea ice 5.5 Cyclone impacts on SIC 5.5.1 Annual cycle in the old Arctic 5.5.2 Changes in the new Arctic 5.5.3 Regional changes in autumn 5.6 Conclusions 5.7 Supplementary material 6 Conclusions and Outlook 6.1 What is the statistical impact of cyclone passages on sea-ice concentration (SIC) in the Atlantic Arctic Ocean? 6.2 What are the individual contributions of dynamic and thermodynamic processes to sea-ice changes related to cyclones? 6.3 Do the SIC impacts of cyclones change in a warming Arctic and what are the related mechanisms? 6.4 Ways forward Appendix: Cyclones modulate the control of the North Atlantic Oscillation on transports into the Barents Sea Bibliography
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  • 88
    Call number: AWI G3-24-95728
    Description / Table of Contents: This atlas is an attempt to translate and consolidate the available knowledge on permafrost. It is a timely book suffused with the compelling enthusiasm of its authors and contributors. Close to a hundred individuals participated in its making, and it does a magnificent job at describing permafrost with maps, words, art, and stories. Far from being an academic product in the traditional sense, it gathers the knowledge from the voices of scientists, Indigenous Peoples, northern residents, and local practitioners to provide a holistic and inclusive view of today’s challenges in the “country of permafrost”.
    Type of Medium: Monograph available for loan
    Pages: 174 Seiten , Illustrationen
    Language: English
    Note: Contents Foreword Prologue Earth’s Freezer: Introduction to Permafrost Frozen grounds: Permafrost in the Arctic Permafrost in profile: Landscape features Frozen in time: The history of permafrost An icy balance: Arctic permafrost physiography What lies within: Organic carbon in permafrost When ice grows up: Pingo Canadian Landmark Drilling down: Learning the secrets of permafrost Portrait: Annett Bartsch Un/settled: Life on frozen ground Frozen States I: Russian Federation Portrait: Vyacheslav Shadrin Frozen States II: North America Portrait: Jessi Pascal Frozen States III: Nordic region Portrait: Palle Jeremiassen Awakening Giant: Permafrost and Climate Change Warming up, warming down: Increasing ground temperatures The chill is gone: Thickening of the active layer Disappearing act: Declining permafrost extent Microorganisms, macro effects: Permafrost carbon cycle Faster, deeper, stronger I: Speed of thaw in North America Faster, deeper, stronger II: Speed of thaw in Scandinavia and the Russian Federation Crossing the threshold: Future scenarios of carbon release Portrait: Dmitry Streletskiy Moving Grounds: Permafrost Changes Frost and flora: The role of vegetation in permafrost landscapes Fire on ice: Peat, permafrost, and fire State of matter: Water, snow, and permafrost The rivers run through it: Arctic rivers, deltas and hydrology Along the edge of the world: Arctic coastal classification Wear and tear: Erosion of Arctic permafrost coasts Eating into the landscape: Retrogressive thaw slumps Portrait: Angus Alunik Losing ground: Projected rates of Arctic coastal erosion Beneath the waves: Changes in subsea permafrost Arctic Ripples: Impacts of Permafrost Thaw Feeling the heat: Permafrost thaw impacts on infrastructure Risky business I: North American Arctic and Kalaallit Nunaat (Greenland) Risky business II: The Russian Federation and Scandinavian Arctic Terra infirma I: Coastal infrastructure in Yamalo-Nenets Portrait: Susanna Gartler Terra infirma II: Reinforcing runways in Paulatuk Terra infirma III: Keeping cold food cold in Alaska Terra infirma IV: Urban planning in Ilulissat Nothing in isolation: Health and wellness and permafrost Portrait: Gwen Healey Akearok Toxic grounds: Contaminants and environmental health Coming back to life: Reemerging pathogens Frozen assets I: The formal economy Frozen assets II: Traditional and subsistence activities Cultural homeland: Alaas landscapes in Yakutia Holding Tight: Adaptation to Permafrost Thaw Bumpy road ahead: Transportation infrastructure and permafrost Undermined: Mining infrastructure and permafrost Keeping the light on: Energy infrastructure and permafrost No time to waste: Waste management and permafrost Modern history: Preserving Svalbard’s cultural heritage Portrait: Ingrid Rekkavik Going South: Permafrost in Other Areas A planetary perspective: Permafrost outside the Arctic Frozen giants: Permafrost in the mountains The view from the top: The Qinghai-Tibetan Plateau, Hindu Kush Himalaya, and Andes Europe’s frozen heart: Permafrost in the Alps The ends of the Earth I: Permafrost in Antarctica The ends of the Earth II: Antarctic Peninsula The ends of the Earth III: Queen Maud Land, Victoria Land, and the McMurdo Dry Valleys Over the Horizon Authors and contributors Acknowledgments Artist spotlight: Olga Borjon-Privé (Oluko) Artist spotlight: Katie Orlinsky Glossary Acronyms References
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