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151. Overview of the MOSAiC expedition: Physical oceanography

Author

Rabe, Benjamin, primary, Heuzé, Céline, additional, Regnery, Julia, additional, Aksenov, Yevgeny, additional, Allerholt, Jacob, additional, Athanase, Marylou, additional, Bai, Youcheng, additional, Basque, Chris, additional, Bauch, Dorothea, additional, Baumann, Till M., additional, Chen, Dake, additional, Cole, Sylvia T., additional, Craw, Lisa, additional, Davies, Andrew, additional, Damm, Ellen, additional, Dethloff, Klaus, additional, Divine, Dmitry V., additional, Doglioni, Francesca, additional, Ebert, Falk, additional, Fang, Ying-Chih, additional, Fer, Ilker, additional, Fong, Allison A., additional, Gradinger, Rolf, additional, Granskog, Mats A., additional, Graupner, Rainer, additional, Haas, Christian, additional, He, Hailun, additional, He, Yan, additional, Hoppmann, Mario, additional, Janout, Markus, additional, Kadko, David, additional, Kanzow, Torsten, additional, Karam, Salar, additional, Kawaguchi, Yusuke, additional, Koenig, Zoe, additional, Kong, Bin, additional, Krishfield, Richard A., additional, Krumpen, Thomas, additional, Kuhlmey, David, additional, Kuznetsov, Ivan, additional, Lan, Musheng, additional, Laukert, Georgi, additional, Lei, Ruibo, additional, Li, Tao, additional, Torres-Valdés, Sinhué, additional, Lin, Lina, additional, Lin, Long, additional, Liu, Hailong, additional, Liu, Na, additional, Loose, Brice, additional, Ma, Xiaobing, additional, McKay, Rosalie, additional, Mallet, Maria, additional, Mallett, Robbie D. C., additional, Maslowski, Wieslaw, additional, Mertens, Christian, additional, Mohrholz, Volker, additional, Muilwijk, Morven, additional, Nicolaus, Marcel, additional, O’Brien, Jeffrey K., additional, Perovich, Donald, additional, Ren, Jian, additional, Rex, Markus, additional, Ribeiro, Natalia, additional, Rinke, Annette, additional, Schaffer, Janin, additional, Schuffenhauer, Ingo, additional, Schulz, Kirstin, additional, Shupe, Matthew D., additional, Shaw, William, additional, Sokolov, Vladimir, additional, Sommerfeld, Anja, additional, Spreen, Gunnar, additional, Stanton, Timothy, additional, Stephens, Mark, additional, Su, Jie, additional, Sukhikh, Natalia, additional, Sundfjord, Arild, additional, Thomisch, Karolin, additional, Tippenhauer, Sandra, additional, Toole, John M., additional, Vredenborg, Myriel, additional, Walter, Maren, additional, Wang, Hangzhou, additional, Wang, Lei, additional, Wang, Yuntao, additional, Wendisch, Manfred, additional, Zhao, Jinping, additional, Zhou, Meng, additional, and Zhu, Jialiang, additional

Published
2022
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153. Cybersecurity for industrial automation and control systems.

Author

Haas, Christian, Bretthauer, Georg, and Beyerer, Jürgen

Subjects
INDUSTRIAL controls manufacturing, INTERNET security, MANAGEMENT information systems, PROCESS control systems, INFORMATION technology
Abstract

This special issue aims to present new cybersecurity research results and methods to help to protect industrial automation and control systems in various industries. Industrial automation and control systems are vital for the functioning of various industries such as energy, transportation, healthcare, and manufacturing. These automation and control systems encompass complex networks of machines, devices, and software applications that control, monitor, and automate critical operations. [Extracted from the article]

Published
2023
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161. Monitoring a changing Arctic: Recent advancements in the study of sea ice microbial communities

Author

Campbell, Karley, primary, Matero, Ilkka, additional, Bellas, Christopher, additional, Turpin-Jelfs, Thomas, additional, Anhaus, Philipp, additional, Graeve, Martin, additional, Fripiat, Francois, additional, Tranter, Martyn, additional, Landy, Jack Christopher, additional, Sanchez-Baracaldo, Patricia, additional, Leu, Eva, additional, Katlein, Christian, additional, Mundy, C. J, additional, Rysgaard, Søren, additional, Tedesco, Letizia, additional, Haas, Christian, additional, and Nicolaus, Marcel, additional

Published
2021
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162. Results from a national survey on COVID‐19‐associated mucormycosis in Germany: 13 patients from six tertiary hospitals

Author

Seidel, Danila, primary, Simon, Michaela, additional, Sprute, Rosanne, additional, Lubnow, Matthias, additional, Evert, Katja, additional, Speer, Claudius, additional, Seeßle, Jessica, additional, Khatamzas, Elham, additional, Merle, Uta, additional, Behrens, Christopher, additional, Blau, Igor Wolfgang, additional, Enghard, Philipp, additional, Haas, Christian S., additional, Steinmann, Joerg, additional, Kurzai, Oliver, additional, and Cornely, Oliver A., additional

Published
2021
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166. Arctic sea ice thickness variability and change

Author

von Albedyll, Luisa, Rinke, Annette, Rabe, Benjamin, Wang, Qiang, and Haas, Christian

Abstract

Arctic sea ice thickness variability and change and their dependence on the atmospheric and oceanic forcing are at the core of research in Subtopic 2.1, Theme: Ongoing and Future Arctic and Antarctic Climate Change. Our research is particularly focused on a better process understanding and representation in models, and observations during MOSAiC play a strong role. The poster gives examples of such process studies focused on Arctic sea ice thickness variability and change. We outline observations of the long-term and regional variability and change of sea ice thickness using satellite remote sensing, airborne surveying, and ice mass balance buoys. Thermodynamic growth and its interaction with the atmosphere over leads and level ice serves as an example for our joint research interests. The poster also gives examples of causes of sea ice thinning, like increased ocean heat flux to the ice due to Atlantification, and consequences, e.g., for reduced sea ice volume transport through Fram Strait.

Published
2021

167. The Arctic

Author

Druckenmiller, Matthew L., Moon, Twila A., Thoman, Richard L., Ballinger, Thomas J., Berner, Logan T., Bernhard, Germar H., Bhatt, Uma S., Bjerke, Jarle W., Box, Jason E., Brown, R., Cappelen, John, Christiansen, Hanne H., Decharme, B., Derksen, C., Divine, Dmitry, Drozdov, D. S., Elias Chereque, A., Epstein, Howard E., Farquharson, L. M., Farrell, Sinead L., Fausto, Robert S., Fettweis, Xavier, Fioletov, Vitali E., Forbes, Bruce C., Frost, Gerald V., Gargulinski, Emily, Gerland, Sebastian, Goetz, Scott J., Grabinski, Z., Grooß, Jens-Uwe, Haas, Christian, Hanna, Edward, Hanssen-Bauer, Inger, Hendricks, Stefan, Holmes, Robert M., Ialongo, Iolanda, Isaksen, K., Jain, Piyush, Johnsen, Bjørn, Kaleschke, L., Kholodov, A. L., Kim, Seong-Joong, Korsgaard, Niels J., Labe, Zachary, Lakkala, Kaisa, Lara, Mark J., Loomis, Bryant, Luojus, K., Macander, Matthew J., Malkova, G. V., Mankoff, Kenneth D., Manney, Gloria L., McClelland, James W., Meier, Walter N., Mote, Thomas, Mudryk, L., Müller, Rolf, Nyland, K. E., Overland, James E., Park, T., Pavlova, Olga, Perovich, Don, Petty, Alek, Phoenix, Gareth K., Raynolds, Martha K., Reijmer, C. H., Richter-Menge, Jacqueline, Ricker, Robert, Romanovsky, Vladimir E., Scott, Lindsay, Shapiro, Hazel, Shiklomanov, Alexander I., Shiklomanov, Nikolai I., Smeets, C. J. P. P., Smith, Sharon L., Soja, Amber, Spencer, Robert G. M., Starkweather, Sandy, Streletskiy, Dimitri A., Suslova, Anya, Svendby, Tove, Tank, Suzanne E., Tedesco, Marco, Tian-Kunze, X., Timmermans, Mary-Louise, Tømmervik, Hans, Tretiakov, Mikhail, Tschudi, Mark, Vakhutinsky, Sofia, van As, Dirk, van de Wal, R. S. W., Veraverbeke, Sander, Walker, Donald A., Walsh, John E., Wang, Muyin, Webster, Melinda, Winton, Øyvind, Wood, K., York, Alison, Ziel, Robert, Sub Dynamics Meteorology, Proceskunde, Sub Algemeen Marine & Atmospheric Res, Marine and Atmospheric Research, Centre national de recherches météorologiques (CNRM), Institut national des sciences de l'Univers (INSU - CNRS)-Météo France-Centre National de la Recherche Scientifique (CNRS), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), and Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS)

Subjects
Atmospheric Science, 010504 meteorology & atmospheric sciences, 0211 other engineering and technologies, Greenland ice sheet, 02 engineering and technology, [SDU.STU.ME]Sciences of the Universe [physics]/Earth Sciences/Meteorology, 01 natural sciences, [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology, Climatology, Taverne, [SDU.STU.HY]Sciences of the Universe [physics]/Earth Sciences/Hydrology, Geology, ComputingMilieux_MISCELLANEOUS, 021101 geological & geomatics engineering, 0105 earth and related environmental sciences
Abstract

International audience

Published
2021

168. Service Markets

Author

Caton, Simon, primary, Haas, Christian, additional, Michalk, Wibke, additional, and Weinhardt, Christof, additional

Published
2015
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173. MOSAiC drift expedition from October 2019 to July 2020: sea ice conditions from space and comparison with previous years

Author

Krumpen, Thomas, primary, von Albedyll, Luisa, additional, Goessling, Helge F., additional, Hendricks, Stefan, additional, Juhls, Bennet, additional, Spreen, Gunnar, additional, Willmes, Sascha, additional, Belter, H. Jakob, additional, Dethloff, Klaus, additional, Haas, Christian, additional, Kaleschke, Lars, additional, Katlein, Christian, additional, Tian-Kunze, Xiangshan, additional, Ricker, Robert, additional, Rostosky, Philip, additional, Rückert, Janna, additional, Singha, Suman, additional, and Sokolova, Julia, additional

Published
2021
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180. Snow Depth Retrieval using Under-Ice Hyperspectral Radiation Measurements

Author

Anhaus, Philipp, Katlein, Christian, Nicolaus, Marcel, Arndt, Stefanie, Jutila, Arttu, and Haas, Christian

Abstract

Light transmission through Arctic sea ice and snow has an important impact on energy partitioning at the atmosphere-ice-ocean interface and the ice-associated ecosystem. Thus, it is crucial to understand which parameters determine the temporal and spatial variation of sea ice transmission. Ice and snow imprint characteristic features on the spectral shape of transmitted light. Here, we aim to use these spectral features to retrieve snow depth from hyperspectral under-ice light measurements. Transmitted spectral radiance was measured underneath a 100 m long transect on level landfast First-Year-Ice (FYI) using a remotely operated vehicle (ROV). Measurements took place off the northern coast of Ellesmere Island close to the Canadian Forces Station Alert in May 2018. Co-located measurements of ice and snow thickness were acquired with an electromagnetic induction device, a Magna-Probe and a terrestrial laser scanner. The small variation in FYI thickness allows separating the spectral effect of snow depth on transmitted radiance spectra. We retrieve snow depth from spectral transflectance data using an inverse algorithm based on normalized difference indices (NDI). We further fit multiplicative exponential functions to the measured spectra to retrieve wavelength-dependent extinction coefficients of sea ice and snow. Fitted values of broadband bulk extinction coefficients range from 1.8 to 3.5 m-1 for sea ice and from 7.4 to 17.2 m-1 for snow. Mean differences in fitted/calculated and measured modal snow depths are 6 cm for the multiplicative exponential functions and 5 cm using NDIs. 41% of the fitted snow depths lie within 5 cm of the measured snow depths using the multiplicative exponential functions and 42% for the NDI-method. The accuracy of snow depth retrieved from our optical approaches is limited to +/-5 cm, as the variation of snow depth within the optical sensor footprint is between 2.5 and 5.0 cm. Our results show how this optical approach allows to derive large-scale snow depth information from under-ice optical spectra e.g. during autonomous long-range under-ice missions, despite its limited spatial resolution and absolute accuracy.

Published
2021

182. Antarctic sea ice reconstructions: pros and cons of highly branched isoprenoids as sea ice proxies

Author

Lamping , Nele, Khoo , Wee Wei, Müller , Juliane, Esper , Oliver, Frederichs , Thomas, and Haas , Christian

Abstract

The reconstruction of past Antarctic sea ice coverage through the application of diatom assemblages is often hampered in near coastal environments due to silica dissolution effects. The more recently established approach of using highly branched isoprenoid biomarkers to identify past sea ice conditions seems a valid method to overcome this limitation and that may also provide insight into ice-shelf dynamics. Here, we evaluate the so-called PIPSO25 index applied to modern surface sediments from the Amundsen Sea, the Drake Passage and Bransfield Strait, and the Weddell Sea. The comparison of biomarker-based sea ice estimates with satellite-derived sea ice concentrations supports the potential of the proxy approach. In a next step, we generated biomarker records using two sediment cores from the western and eastern Weddell Sea to track sea ice variability over late Pleistocene glacial-interglacial cycles. Consideration of additional data such as XRF and multi-sensor core logging records as well as micropaleontological investigations enables a comprehensive assessment of the environmental changes in the Weddell Sea in response to large-scale climate transitions. While magnetic susceptibility and density data obtained for both cores display similar patterns, we note distinct differences between the biomarker records highlighting local feedback mechanisms affecting sea ice cover.

Published
2021
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187. Interannual variability in Transpolar Drift summer sea ice thickness and potential impact of Atlantification

Author

Belter, H. Jakob, primary, Krumpen, Thomas, additional, von Albedyll, Luisa, additional, Alekseeva, Tatiana A., additional, Birnbaum, Gerit, additional, Frolov, Sergei V., additional, Hendricks, Stefan, additional, Herber, Andreas, additional, Polyakov, Igor, additional, Raphael, Ian, additional, Ricker, Robert, additional, Serovetnikov, Sergei S., additional, Webster, Melinda, additional, and Haas, Christian, additional

Published
2021
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195. The MOSAiC Drift: Ice conditions from space and comparison with previous years

Author

Krumpen, Thomas, primary, von Albedyll, Luisa, additional, Goessling, Helge F., additional, Hendricks, Stefan, additional, Juhls, Bennet, additional, Spreen, Gunnar, additional, Willmes, Sascha, additional, Belter, H. Jakob, additional, Dethloff, Klaus, additional, Haas, Christian, additional, Kaleschke, Lars, additional, Katlein, Christian, additional, Tian-Kunze, Xiangshan, additional, Ricker, Robert, additional, Rostosky, Philip, additional, Rueckert, Janna, additional, Singha, Suman, additional, and Sokolova, Julia, additional

Published
2021
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196. Supplementary material to "The MOSAiC Drift: Ice conditions from space and comparison with previous years"

Author

Krumpen, Thomas, primary, von Albedyll, Luisa, additional, Goessling, Helge F., additional, Hendricks, Stefan, additional, Juhls, Bennet, additional, Spreen, Gunnar, additional, Willmes, Sascha, additional, Belter, H. Jakob, additional, Dethloff, Klaus, additional, Haas, Christian, additional, Kaleschke, Lars, additional, Katlein, Christian, additional, Tian-Kunze, Xiangshan, additional, Ricker, Robert, additional, Rostosky, Philip, additional, Rueckert, Janna, additional, Singha, Suman, additional, and Sokolova, Julia, additional

Published
2021
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198. Linking Sea Ice Deformation to Ice Thickness Redistribution Using High-Resolution Satellite Radar and Airborne Ice Thickness Observations

Author

von Albedyll, Luisa, Haas, Christian, and Dierking, Wolfgang

Subjects
Astrophysics::Earth and Planetary Astrophysics, Physics::Atmospheric and Oceanic Physics, Physics::Geophysics
Abstract

Dynamic processes can contribute more than 50% to the total thickness of deformed sea ice. They gain importance in the context of a changing Arctic, in which reduced ice thickness and increased drift speed enhance deformation events that might compensate the thermodynamic thinning. The case study of an unusual, large polynya that opened and then closed by freezing and convergence north of the coast of Greenland in late winter 2018 offers us the unique chance to study the effects of dynamics on ice thickness in detail. We calculated drift and deformation fields for the closing phase of the polynya from a time series of daily Synthetic Aperture Radar (SAR) satellite images and measured the accumulated effects of dynamic and thermodynamic ice growth with an airborne electromagnetic (AEM) ice thickness survey one month after the closing began. We observed that strong ice convergence decreased the area of the former polynya by a factor of 2.5 while the AEM survey indicated mean and modal thicknesses of the one-month old ice of 1.96 and 0.95 m, respectively. This is in close agreement with the calculated thermodynamic growth and with the dynamic thickening expected from the polynya area decrease. Further, we identified characteristic differences in the shapes of ice thickness distributions in different regions of the closing polynya that are linked to the deformation histories of the ice. We reconstructed the deformation history by combining Lagrangian backward trajectories with the deformation fields derived from high-resolution SAR imagery. We found a linear proportionality between convergence and thickness change in good agreement with ice thickness redistribution theory. Further, we identified a proportionality between the e-folding of the tails of the different ice thickness distributions and the magnitude of the total deformation experienced by the ice. Lastly, we developed a simple volume-conserving model to derive dynamic ice thicknesses change from high-resolution SAR deformation tracking. Model and AEM observations agree reasonably well and the derived ice thickness distribution reproduce main characteristics like mode, width, and e-folding of the observed distribution. Hence, this shows that high-resolution SAR deformation observations are capable of producing realistic ice thickness distributions.

Published
2020

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