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  • 1
    Monograph available for loan
    Monograph available for loan
    Amsterdam : Elsevier
    Call number: AWI G2-21-94484
    Description / Table of Contents: Although it is generally accepted that the Arctic Ocean is a very sensitive and important region for changes in the global climate, this region is the last major physiographic province of the earth whose short-and long-term geological history is much less known in comparison to other ocean regions. This lack of knowledge is mainly caused by the major technological/logistic problems in reaching this harsh, ice-covered region with normal research vessels and in retrieving long and undisturbed sediment cores. During the the last about 20 years, however, several international and multidisciplinary ship expeditions, including the first scientific drilling on Lomonosov Ridge in 2004, a break-through in Arctic research, were carried out into the central Artic and its surrounding shelf seas. Results from these expeditions have greatly advanced our knowledge on Arctic Ocean paleoenvironments. Published syntheses about the knowledge on Arctic Ocean geology, on the other hand, are based on data available prior to 1990. A comprehensive compilation of data on Arctic Ocean paleoenvironment and its short-and long-term variability based on the huge amount of new data including the ACEX drilling data, has not been available yet. With this book, presenting (1) detailed information on glacio-marine sedimentary processes and geological proxies used for paleoenvironmental reconstructions, and (2) detailed geological data on modern environments, Quaternary variability on different time scales as well as the long-term climate history during Mesozoic-Tertiary times, this gap in knowledge will be filled.
    Type of Medium: Monograph available for loan
    Pages: XIV, 592 Seiten , Illustrationen
    Edition: First edition
    ISBN: 9780444520180
    Series Statement: Developments in marine geology 2
    Language: English
    Note: Contents Preface Acknowledgements List of Abbreviations Part 1: Introduction and Background Chapter 1. Introduction to the Arctic: Significance and History 1.1 The Arctic Ocean and Its Significance for the Earth's Climate System 1.2 History of Arctic Ocean Research 1.3 Plate Tectonic Evolution and Palaeogeography 1.4 Glaciations in Earth's History Chapter 2. Modern Physiography, Hydrology, Climate, and Sediment Input 2.1 Bathymetry and Physiography 2.2 Oceanic Circulation Pattern and Water-Mass Characteristics 2.3 Sea-Ice Cover: Extent, Thickness, and Variability 2.4 Primary Production and Vertical Carbon Fluxes in the Arctic Ocean 2.5 River Discharge 2.6 Permafrost 2.7 Coastal Erosion 2.8 Aeolian Input 2.9 Modern Sediment Input: A Summary Part 2: Processes and Proxies Chapter 3. Glacio-Marine Sedimentary Processes 3.1 Sea-Ice Processes: Sediment Entrainment and Transport 3.2 Ice Sheet- and Iceberg-Related Processes 3.3 Sediment Mass-Wasting Processes 3.4 Turbidite Sedimentation in the Central Arctic Ocean Chapter 4. Proxies Used for Palaeoenvironmental Reconstructions in the Arctic Ocean 4.1 Lithofacies Concept 4.2 Grain-Size Distribution 4.3 Proxies for Sources and Transport Processes of Terrigenous Sediments 4.4 Trace Elements Used for Palaeoenvironmental Reconstruction 4.5 Micropalaeontological Proxies and Their (Palaeo-) Environmental and Stratigraphical Significance 4.6 Stable Isotopes of Foraminifers 4.7 Organic-Geochemical Proxies for Organic-Carbon Source and Palaeoenvironment Part 3: The Marine-Geological Record 5 Modern Environment and its record in surface sediments 5.1 Terrigenous (non-biogenic) components in Arctic Ocean surface sediments: Implications for provenance and modern transport processes 5.2 Organic-Carbon Content: Terrigenous Supply versus Primary Production Chapter 6. Quaternary Variability of Palaeoenvironment and Its Sedimentary Record 6.1 The Stratigraphic Framework of Arctic Ocean Sediment Cores: Background, Problems, and Perspectives 6.2 Variability of Quaternary Ice Sheets and Palaeoceanographic Characteristics: Terrestrial, Model, and Eurasian Continental Margin Records 6.3 Circum-Arctic Glacial History, Sea-Ice Cover, and Surface-Water Characteristics: Quaternary Records from the Central Arctic Ocean 6.4 Accumulation of Particulate Organic Carbon at the Arctic Continental Margin and Deep-Sea Areas During Late Quaternary Times Chapter 7. Mesozoic to Cenozoic Palaeoenvironmental Records of High Northern Latitudes 7.1 Mesozoic High-Latitude Palaeoclimate and Arctic Ocean Palaeoenvironment 7.2 Cenozoic High-Latitude Palaeoclimate and Arctic Ocean Palaeoenvironment Chapter 8. Open Questions and Future Geoscientific Arctic Ocean Research 8.1 Quaternary and Neogene Climate Variability on Sub-Millennial to Milankovich Time Scales 8.2 The Mesozoic-Cenozoic History of the Arctic Ocean References Index
    Location: AWI Reading room
    Branch Library: AWI Library
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  • 2
    Keywords: DDC 515.35 ; LC QA371 ; Differential equations ; Differential equations, Partial ; Evolution equations
    Pages: Online-Ressource (xv, 592 pages)
    ISBN: 9780444530349
    Language: English
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  • 3
    Pages: Online-Ressource (1-1098, I1-I32 Seiten)
    ISBN: 9780444826428
    Language: English
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  • 4
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    Deutsches GeoForschungsZentrum GFZ
    In:  Scientific Technical Report STR
    Publication Date: 2020-02-12
    Description: In this report, we will present the complete derivation of analytical expressions of the EM coupling torque in dependence on the parameters of the fields contributing to it. For this, we choose a special set of spherically harmonic (SH) base functions and present all major steps of the derivation. Our report will be (i) closer to a lecture note than to a scientific paper and should give all readers the possibility to follow the derivations with the related details in the appendix, and can be (ii) used as a formulary for scientists working on this special field of investigation.
    Language: English
    Type: info:eu-repo/semantics/report
    Format: application/pdf
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  • 5
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    Deutsches GeoForschungsZentrum GFZ
    In:  Scientific Technical Report STR
    Publication Date: 2020-02-12
    Description: For the motivation behind our investigations, we refer to the introduction of the first part of our report, Hagedoorn & Geiner-Mai (2008). In this part, we will (i) give an analytical description of the topographic surface of the core-mantle boundary (CMB) and derive an approximation for its normal unit vector containing information about the CMB topography, and (ii) derive an expression for the topographic torque as a function of the topographic height, h, and the velocity field, u. For this, we will check the assumptions made when applying the geostrophic approximation to the upper core-surface region. Finally, we will derive analytical expressions for the torque components depending upon the spherical harmonic (SH) coefficients of h and u in a cartesian geocentric coordinate system.
    Language: English
    Type: info:eu-repo/semantics/report
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  • 6
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    Deutsches GeoForschungsZentrum GFZ
    In:  Scientific Technical Report STR
    Publication Date: 2020-02-12
    Description: This volume contains extended abstracts from talks and posters presented at the sixth TRACE (Tree Rings in Archaeology, Climatology and Ecology) conference, held in Riga (Latvia) May 3rd – 6th, 2007.
    Language: English
    Type: info:eu-repo/semantics/report
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  • 7
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    Deutsches GeoForschungsZentrum GFZ
    In:  Scientific Technical Report STR
    Publication Date: 2020-02-12
    Description: In this study two aspects of the geomagnetic field have been investigated. The first part focuses on perturbations of the external field, as seen by the CHAMP satellite and predicted by the Thermosphere-Ionosphere Electrodynamic General Circulation Model, for the purpose of helping to separate out ionospheric sources from the ambient geomagnetic field using a physics based approach. Part two looks at variations of the internal field through an examination of the South Atlantic Anomaly.
    Language: English
    Type: info:eu-repo/semantics/doctoralThesis
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  • 8
    Publication Date: 2021-10-12
    Language: German , English
    Type: info:eu-repo/semantics/other
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  • 9
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    Deutsches GeoForschungsZentrum GFZ
    Publication Date: 2021-10-12
    Language: German , English
    Type: info:eu-repo/semantics/other
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  • 10
    Publication Date: 2021-08-21
    Description: The dynamic oblateness of the Earth, in terms of the J2 or C20 coefficient of the Earth´s geo-potential has been derived by analysis of LAGEOS Satellite Laser Ranging (SLR) data. Although recent analyses of GRACE (Gravity Recovery and Climate Experiment) mission data of monthly C20 values since 2002 have shown high temporal correlations with LAGEOS results, significant differences still remain. As it is common practice in GRACE data processing to remove a priori the short-term nontidal atmospheric and oceanic induced variations of the gravity potential via the socalled Atmosphere and Ocean De-aliasing Level-1B (AOD1B) products, their use for LAGEOS data processing would allow a direct comparison of results and a rigorous combination of the solutions. Since the consideration of short-term non-tidal atmospheric and oceanic mass redistributions by means of AOD1B time series reveals a significant impact on LAGEOS data processing results, the AOD1B time series has been consistently prolongated back to the advent of LAGEOS-1 in 1976. An analysis for the period 1993-2006 leads to the major findings that the consideration of atmospheric and oceanic mass redistributions result in a considerably reduced seasonal signal in the LAGEOS C20 time series. This in turn reduces the correlation to GRACE significantly by about 30%. This is in opposite to what one would expect, i.e., a better agreement between GRACE and LAGEOS if common standards are applied. Thus, a LAGEOS solution corrected for short-term non-tidal atmosphere and ocean effects is much less sensitive to primarily annual hydrological mass variations than GRACE. In addition, significant semi-annual signals remain. Other indicators such as the unresolved bias between LAGEOS and GRACE in the order of 2·10-10 or LAGEOS orbits and Satellite Laser Ranging (SLR) observation residuals are hardly affected by the AOD1B model.
    Language: English
    Type: info:eu-repo/semantics/report
    Format: application/pdf
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