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  • 1
    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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  • 2
    Call number: ZSP-168-716
    In: Berichte zur Polar- und Meeresforschung, 716
    Type of Medium: Series available for loan
    Pages: 211 Seiten , Illustrationen
    ISSN: 1866-3192
    Series Statement: Berichte zur Polar- und Meeresforschung 716
    Language: English
    Note: Contents Characterization of soil organic matter of Arctic and Antarctic by 13- C NMR and electron spin resonance spectroscopy / Evgeny Abakumov Development of phosphorus forms in soil chronosequence of the Nordenskioldbreen glacier (Svalbard) / Adel Allaberdina, Václav Tejnecký Vertical snow structures from in-situ and remote sensing measurements / Stefanie Arndt, Nicolas Stoll, Stephan Paul, Christian Haas Phenology of Calanus glacialis – comparison between Arctic and Atlantic domains and its implications for reproductive success of little auks / Kaja Balazy, Emilia Trudnowska, Katarzyna Blachowiak-Samolyk Response of southern tundra ecosystem components on aerial pollution from gas pre-treatment centers in West Siberia / Pavel A. Barsukov Soil-ecological excursions to permafrost-affected areas in West Siberia for European scientists and students / Pavel A. Barsukov, S. Platonova, S. Gizhitskaya, E. Smolentseva, N. Lashchinskiy, A. Babenko, I. Lyubechanskiy, O. Saprykin, O.Rusalimova Christian Siewert Freezing and hungry? Hydrocarbon degrading microbial communities in Barents Sea sediments around Svalbard / Bartholomäus Sven, Nontje Straaten, Daniela Zoch, Martin Krüger Biological soil crust algae in the polar regions – biodiversity, genetic diversity and ecosystem resilience under global change scenarios / Burkhard Becker, Burkhard Büdel and Ulf Karsten UDASH - Unified Database for Arctic and Subarctic Hydrography / Axel Behrendt, Hiroshi Sumata, Benjamin Rabe, Torsten Kanzow and Ursula Schauer Compound-specific radiocarbon constraints on Antarctic sediment chronologies / Sonja Berg, Sandra Jivcov, Janet Rethemeyer Environmental conditions in terrestrial East Antarctica during the last glacial - new evidence from mumiyo deposits / Sonja Berg, Martin Melles, Wolf-Dieter Hermichen, Janet Rethemeyer, Gerhard Kuhn Collection-based diatom research: collection imaging to biogeography and microevolution in the Southern Ocean / Bánk Beszteri, Stefan Pinkernell, Michael Kloster, Ute Postel, Gerhard Kauer, Uwe John, Klaus Valentin, Gernot Glöckner In vivo observations of OWA induced pH changes in the brain of polar cod Boreogadus saida / Christian Bock, Felizitas C. Wermter, Bastian Maus, Hans-O. Pörtner, Wolfgang Dreher A journey into the Triassic polar forests of Antarctica / Benjamin Bomfleur Long-term time-series of Arctic BrO derived from UV-VIS satellite remote sensing / lias Bougoudis, Anne-Marlene Blechschmidt, Andreas Richter, Sora Seo, John P. Burrows The effect of climate change on the carbon balance in microalgae / Deborah Bozzato, Torsten Jakob, Christian Wilhelm Species composition and abundance of the shallow water fish community of Kongsfjorden, Svalbard / Markus Brand, Philipp Fischer Decadal changes in a breeding population of southern giant petrels on King George Island, Antarctic, in response to human activities / Christina Braun, Jan Esefeld, Hans-Ulrich Peter Geodetic GNSS measurements to investigate the recent crustal deformation at the Antarctic Peninsula and in the Amundsen Sea Embayment, West Antarctica / Peter Busch, Mirko Scheinert, Christoph Knöfel, Lutz Eberlein, Martin Horwath, Ludwig Schröder, Andreas Groh Parameterization of snow BRDF measurements in Antarctica / T. Carlsen, G. Birnbaum, A. Ehrlich, M. Schäfer, and M. Wendisch Airborne and in situ ground-based measurements of surface albedo, bidirectional reflectivity, and snow properties on the Antarctic plateau / T. Carlsen, M. Belke Brea, G. Birnbaum, A. Ehrlich, J. Freitag, G. Heygster, L. Istomina, S. Kipfstuhl, A. Orsi, M. Schäfer, and M. Wendisch Retreats of ice sheet and ice shelf driven by warm water incursions in the Ross Sea since the Last Glacial Maximum / Zhihua Chen, Mengshan Ju, Shulan Ge, Zheng Tang, Yuanhui Huang, Renjie Zhao, Ralf Tiedemann, Lester Lembke-Jene Influence of breeze circulation on local wind climatology in Svalbard fjords / Małgorzata Cisek, Przemysław Makuch, Tomasz Petelski, Jacek Piskozub Life strategies on photobiology and metabolite profile of genetic indentical photobionts of two different lichen species / Nadine Determeyer-Wiedmann, Sieglinde Ott Land-Ocean Interactions in the late glacial Bering Sea / B. Diekmann, R. Wang, H. Kühn, R. Gersonde, R. Tiedemann, G. Kuhn Does environmental change affect polar microbial communities? / Daniel R. Dietrich Rapid glacial isostatic uplift in Patagonia: Interplay of enhanced ice mass loss and slab window tectonics / R. Dietrich, A. Richter, E. Ivins, H. Lange, L. Mendoza, L. Schröder, J.L. Hormaechea, G. Casassa, E. Marderwald, M. Fritsche, R. Perdomo, M. Horwath Phylogenomics of the longitarsal Colossendeidae: the evolution of a diverse Antarctic sea spider radiation / Lars Dietz, Jana S. Dömel, Christoph Mayer, Florian Leese Revealing the evolutionary history of Southern Ocean sea spiders using genome-wide SNP data / Jana S. Dömel, Till-Hendrik Macher, Lars Dietz, Christoph Mayer, Roland R. Melzer and Florian Leese Geothermal heat flux derived from airborne magnetic grids and measured temperature gradients in the Amundsen Sea sector of West Antarctica / Ricarda Dziadek, Karsten Gohl, Fausto Ferraccioli, Norbert Kaul, Cornelia Spiegel Sea spray aerosol fluxes in the area of the Spitsbergen Shelf and the Greenland Sea / K. Dziembor, T. Petelski, P. Markuszewski, T. Zieliński, P. Makuch, I. Wróbel More than two decades of geodetic GNSS measurements in Antarctica, Greenland and Patagonia – a technology review / Lutz Eberlein, Mirko Scheinert, Peter Busch, Christoph Knöfel, Andreas Richter Analysing the flow velocity of major outlet glaciers in North Greenland using Landsat data / Benjamin Ebermann, Ralf Rosenau, Mirko Scheinert, Martin Horwath Partitioning growing season net ecosystem exchange of CO2 into photosynthesis, autotrophic and heterotrophic respiration in the Siberian tundra / Tim Eckhardt, Christian Knoblauch, Lars Kutzbach, Gillian Simpson, Eva-Maria Pfeiffer Meteorological collaboration in the Arctic / Johanna Ekman Meteorological aspects of S.A. Andrée’s attempt to reach the North Pole by balloon in 1897 / Dieter Etling Geodetic mass balance on South Georgia glaciers / David Farias-Barahona, Christian Sommer, Thorsten Seehaus, Philipp Malz, Gino Casassa, Matthias H. Braun Frozen-Ground Cartoons: An international collaboration between artists and permafrost scientists / Michael Fritz, Frédéric Bouchard, Bethany Deshpande, Julie Malenfant-Lepage, Alexandre Nieuwendam, Michel Paquette, Ashley Rudy, Matthias Siewert, Audrey Veillette, Stefanie Weege, Jon Harbor, Otto Habeck, Ylva Sjöberg The Akademii Nauk ice core and solar activity / Diedrich Fritzsche, Luisa von Albedyll, Silke Merchel, Thomas Opel, Georg Rugel, Andreas Scharf Walther Bruns, Gründer der „Aeroarctic“ – ein vergessener Pionier der Deutschen Polarforschung / Diedrich Fritzsche Warming and reduction of precipitations affect the microbiome of recently deglaciated soils in the Swiss Alps / Aline Frossard, Johanna Donhauser, Pascal Niklaus, Thomas Rime, Beat Frey The ice-free topography of Svalbard / Johannes J. Fürst, Francisco Navarro, Fabien Gillet-Chaulet, Geir Moholdt, Xavier Fettweis, Charlotte Lang, Thorsten Seehaus, Matthias H. Braun, Douglas I. Benn, Toby J. Benham, Julian A. Dowdeswell, Mariusz Grabiec, Jack Kohler, Katrin Lindbäck, Rickard Pettersson, Heidi Sevestre Scientific Drilling in Antarctica? Coming to a new drilling proposal / Christoph Gaedicke, Gerhard Kuhn, Olaf Eisen, Andreas Läufer, Emma Smith, Nikola Koglin, Boris Biskaborn, Dieter Franke, Ralf Tiedemann German permanent research facilities in Antarctica - a 40 years record / Hartwig Gernandt Pre-glacial and glacial shelf evolution from seismic and seabed drill records of the Amundsen Sea, West Antarctica / Karsten Gohl, Gabriele Uenzelmann-Neben, Robert Larter, Johann Klages, Claus-Dieter Hillenbrand, Torsten Bickert, Steve Bohaty, Ulrich Salzmann, Thomas Frederichs, Catalina Gebhardt, Katharina Hochmuth and Expedition PS104 Science Party The Turnove
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  • 3
    Series available for loan
    Series available for loan
    Bremerhaven : Alfred-Wegener-Inst. für Polar- und Meeresforschung
    Associated volumes
    Call number: ZSP-168-269
    In: Berichte zur Polarforschung
    Type of Medium: Series available for loan
    Pages: 93 S. : Abb. ; 24 cm
    ISSN: 0176-5027
    Series Statement: Berichte zur Polarforschung 269
    Language: English
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