Blar i forfatter "Nicolaus, Marcel"

Viser treff 1-11 av 11

    • Different mechanisms of Arctic first-year sea-ice ridge consolidation observed during the MOSAiC expedition 

      Salganik, Evgenii; Lange, Benjamin; Itkin, Polona; Divine, Dmitry; Katlein, Christian; Nicolaus, Marcel; Hoppmann, Mario; Neckel, Niklas; Ricker, Robert; Høyland, Knut Vilhelm; Granskog, Mats (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-06-22)
      Sea-ice ridges constitute a large fraction of the ice volume in the Arctic Ocean, yet we know little about the evolution of these ice masses. Here we examine the thermal and morphological evolution of an Arctic firstyear sea-ice ridge, from its formation to advanced melt. Initially the mean keel depth was 5.6 m and mean sail height was 0.7 m. The initial rubble macroporosity (fraction of seawater ...

    • Monitoring a changing Arctic: Recent advancements in the study of sea ice microbial communities 

      Campbell, Karley; Matero, Ilkka; Bellas, Christopher; Turpin-Jelfs, Thomas; Anhaus, Philipp; Graeve, Martin; Fripiat, Francois; Tranter, Martyn; Landy, Jack Christopher; Sanchez-Baracaldo, Patricia; Leu, Eva; Katlein, Christian; Mundy, C.J.; Rysgaard, Søren; Tedesco, Letizia; Haas, Christian; Nicolaus, Marcel (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-11-25)
      Sea ice continues to decline across many regions of the Arctic, with remaining ice becoming increasingly younger and more dynamic. These changes alter the habitats of microbial life that live within the sea ice, which support healthy functioning of the marine ecosystem and provision of resources for human-consumption, in addition to influencing biogeochemical cycles (e.g. air–sea CO<sub>2</sub> ...

    • Monitoring a changing Arctic: Recent advancements in the study of sea ice microbial communities 

      Matero, Ilkka; Bellas, Christopher; Turpin-Jelfs, Thomas; Anhaus, Philipp; Graeve, Martin; Fripiat, Francois; Tranter, Martyn; Landy, Jack Christopher; Sanchez-Baracaldo, Patricia; Leu, Eva; Katlein, Christian; Mundy, C.J.; Rysgaard, Søren; Tedesco, Letizia; Haas, Christian; Nicolaus, Marcel (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-11-25)
      Sea ice continues to decline across many regions of the Arctic, with remaining ice becoming increasingly younger and more dynamic. These changes alter the habitats of microbial life that live within the sea ice, which support healthy functioning of the marine ecosystem and provision of resources for human-consumption, in addition to influencing biogeochemical cycles (e.g. air–sea CO2 exchange). With ...

    • Net heterotrophy in High Arctic first-year and multi-year spring sea ice 

      Campbell, Karley; Lange, Benjamin; Landy, Jack Christopher; Katlein, Christian; Nicolaus, Marcel; Anhaus, Philipp; Matero, Ilkka; Gradinger, Rolf; Charette, Joannie; Duerksen, Steven; Tremblay, Pascal; Rysgaard, Søren; Tranter, Martyn; Haas, Christian; Michel, Christine (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-01-04)
      The net productivity of sea ice is determined by the physical and geochemical characteristics of the ice–ocean system and the activity of organisms inhabiting the ice. Differences in habitat suitability between first-year and multi-year sea ice can affect the ice algal community composition and acclimation state, introducing considerable variability to primary production within each ice type. In ...

    • Overview of the MOSAiC expedition- Atmosphere 

      Shupe, Matthew D.; Rex, Markus; Blomquist, Byron; G. Persson, P. Ola; Schmale, Julia; Uttal, Taneil; Althausen, Dietrich; Angot, Hélène; Archer, Stephen; Bariteau, Ludovic; Beck, Ivo; Bilberry, John; Bucci, Silvia; Buck, Clifton; Boyer, Matt; Brasseur, Zoé; Brooks, Ian M.; Calmer, Radiance; Cassano, John; Castro, Vagner; Chu, David; Costa, David; Cox, Christopher J.; Creamean, Jessie; Crewell, Susanne; Dahlke, Sandro; Damm, Ellen; de Boer, Gijs; Deckelmann, Holger; Dethloff, Klaus; Dütsch, Marina; Ebell, Kerstin; Ehrlich, André; Ellis, Jody; Engelmann, Ronny; Fong, Allison A.; Frey, Markus M.; Gallagher, Michael R.; Ganzeveld, Laurens; Gradinger, Rolf Rudolf; Graeser, Jürgen; Greenamyer, Vernon; Griesche, Hannes; Griffiths, Steele; Hamilton, Jonathan; Heinemann, Günther; Helmig, Detlev; Herber, Andreas; Heuzé, Céline; Hofer, Julian; Houchens, Todd; Howard, Dean; Inoue, Jun; Jacobi, Hans-Werner; Jaiser, Ralf; Jokinen, Tuija; Jourdan, Olivier; Jozef, Gina; King, Wessley; Kirchgaessner, Amelie; Klingebiel, Marcus; Krassovski, Misha; Krumpen, Thomas; Lampert, Astrid; Landing, William; Laurila, Tiia; Lawrence, Dale; Lonardi, Michael; Loose, Brice; Lüpkes, Christof; Maahn, Maximilian; Macke, Andreas; Maslowski, Wieslaw; Marsay, Christopher; Maturilli, Marion; Mech, Mario; Morris, Sara; Moser, Manuel; Nicolaus, Marcel; Ortega, Paul; Osborn, Jackson; Pätzold, Falk; Perovich, Donald K.; Petäjä, Tuukka; Pilz, Christian; Pirazzini, Roberta; Posman, Kevin; Powers, Heath; Pratt, Kerri A.; Preußer, Andreas; Quéléver, Lauriane; Radenz, Martin; Rabe, Benjamin; Rinke, Annette; Sachs, Torsten; Schulz, Alexander; Siebert, Holger; Silva, Tercio; Solomon, Amy; Sommerfeld, Anja; Spreen, Gunnar; Stephens, Mark; Stohl, Andreas; Svensson, Gunilla; Uin, Janek; Viegas, Juarez; Voigt, Christiane; von der Gathen, Peter; Wehner, Birgit; Welker, Jeffrey M.; Wendisch, Manfred; Werner, Martin; Xie, ZhouQing; Yue, Fange (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-02-07)
      With the Arctic rapidly changing, the needs to observe, understand, and model the changes are essential. To support these needs, an annual cycle of observations of atmospheric properties, processes, and interactions were made while drifting with the sea ice across the central Arctic during the Multidisciplinary drifting Observatory for the Study of Arctic Climate (MOSAiC) expedition from October ...

    • Overview of the MOSAiC expedition: Physical oceanography 

      Rabe, Benjamin; Baumann, Till Martin; Divine, Dmitry; Fer, Ilker; Gradinger, Rolf Rudolf; Granskog, Mats; Koenig, Zoe Charlotte; Muilwijk, Morven; Sundfjord, Arild; Heuze´, Céline; Regnery, Julia; Aksenov, Yevgeny; Allerholt, Jacob; Athanase, Marylou; Bai, Youcheng; Basque, Chris; Bauch, Dorothea; Chen, Dake; Cole, Sylvia T.; Craw, Lisa; Davies, Andrew; Damm, Ellen; Dethloff, Klaus; Doglioni, Francesca; Ebert, Falk; Fang, Ying-Chih; Fong, Allison A.; Graupner, Rainer; Haas, Christian; He, Hailun; He, Yan; Hoppmann, Mario; Janout, Markus; Kadko, David; Kanzow, Torsten; Karam, Salar; Kawaguchi, Yusuke; Kong, Bin; Krishfield, Richard A.; Krumpen, Thomas; Kuhlmey, David; Kuznetsov, Ivan; Lan, Musheng; Laukert, Georgi; Lei, Ruibo; Li, Lao; Torres-Valdés, Sinhué; Lin, Lina; Lin, Long; Liu, Hailong; Liu, Na; Loose, Brice; Ma, Xiaobing; McKay, Rosalie; Mallet, Maria; Mallet, Robbie D .C.; Maslowski, Wieslaw; Mertens, Christian; Mohrholz, Volker; Nicolaus, Marcel; O'Brien, Jeffrey K.; Perovich, Donald; Ren, Jian; Rex, Markus; Ribeiro, Natalia; Rinke, Annette; Sokolov, Vladimir; Sommerfeld, Anja; Spreen, Gunnar; Stanton, Timothy; Stephens, Mark; Su, Jie; Sukhikh, Natalia; Thomisch, Karolin; Tippenhauer, Sandra; Toole, John M.; Vredenborg, Myriel; Walter, Maren; Wang, Hangzhou; Wang, Lei; Wang, Yuntao; Wendisch, Manfred; Zhao, Jinping; Zhou, Meng; Zhu, Jialiang (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-02-07)
      Arctic Ocean properties and processes are highly relevant to the regional and global coupled climate system, yet still scarcely observed, especially in winter. Team OCEAN conducted a full year of physical oceanography observations as part of the Multidisciplinary drifting Observatory for the Study of the Arctic Climate (MOSAiC), a drift with the Arctic sea ice from October 2019 to September 2020. ...

    • Platelet ice under Arctic pack ice in winter 

      Katlein, Christian; Mohrholz, Volker; Sheikin, Igor; Itkin, Polona; Divine, Dmitry; Stroeve, Julienne C.; Jutila, Arttu; Krampe, Daniela; Shimanchuk, Egor; Raphael, Ian; Rabe, Benjamin; Kuznetsov, Ivan; Mallet, Maria; Liu, Hailong; Hoppmann, Mario; Fang, Ying‐Chih; Dumitrascu, Adela; Arndt, Stefanie; Anhaus, Philipp; Nicolaus, Marcel; Matero, Ilkka; Oggier, Marc; Eicken, Hajo; Haas, Christian (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-08-17)
      The formation of platelet ice is well known to occur under Antarctic sea ice, where subice platelet layers form from supercooled ice shelf water. In the Arctic, however, platelet ice formation has not been extensively observed, and its formation and morphology currently remain enigmatic. Here, we present the first comprehensive, long‐term in situ observations of a decimeter thick subice platelet ...

    • Sea-ice decline could keep zooplankton deeper for longer 

      Flores, Hauke; Veyssière, Gaëlle; Castellani, Giulia; Wilkinson, Jeremy; Hoppmann, Mario; Karcher, Michael; Valcic, Lovro; Cornils, Astrid; Geoffroy, Maxime; Nicolaus, Marcel; Niehoff, Barbara; Priou, Pierre; Schmidt, Katrin; Stroeve, Julienne (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-08-28)
      As Arctic sea ice deteriorates, more light enters the ocean, causing largely unknown effects on the ecosystem. Using an autonomous biophysical observatory, we recorded zooplankton vertical distribution under Arctic sea ice from dusk to dawn of the polar night. Here we show that zooplankton ascend into the under-ice habitat during autumn twilight, following an isolume of 2.4 × 10<sup>−4</sup>  ...

    • Snowfall and snow accumulation during the MOSAiC winter and spring seasons 

      Wagner, David N.; Shupe, Matthew D.; Cox, Christopher; Persson, Ola G.; Uttal, Taneil; Frey, Markus M.; Kirchgaessner, Amélie; Schneebeli, Martin; Jaggi, Matthias; MacFarlane, Amy R.; Itkin, Polona; Arndt, Stefanie; Hendricks, Stefan; Krampe, Daniela; Nicolaus, Marcel; Ricker, Robert; Regnery, Julia; Kolabutin, Nikolai; Shimanshuck, Egor; Oggier, Marc; Raphael, Ian; Stroeve, Julienne; Lehning, Michael (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-06-17)
      Data from the Multidisciplinary drifting Observatory for the Study of Arctic Climate (MOSAiC) expedition allowed us to investigate the temporal dynamics of snowfall, snow accumulation and erosion in great detail for almost the whole accumulation season (November 2019 to May 2020). We computed cumulative snow water equivalent (SWE) over the sea ice based on snow depth and density retrievals from a ...

    • Thermodynamic and dynamic contributions to seasonal Arctic sea ice thickness distributions from airborne observations 

      von Albeldyll, Luisa; Hendricks, Stefan; Grodofzig, Raphael; Krumpen, Thomas; Arndt, Stefanie; Belter, H. Jakob; Birnbaum, Gerit; Cheng, Bin; Hoppmann, Mario; Hutchings, Jennifer; Itkin, Polona; Lei, Ruibo; Nicolaus, Marcel; Ricker, Robert; Rohde, Jan; Suhrhoff, Mira; Timofeeva, Anna; Watkins, Daniel; Webster, Melinda; Haas, Christian (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-04-18)
      Sea ice thickness is a key parameter in the polar climate and ecosystem. Thermodynamic and dynamic processes alter the sea ice thickness.The Multidisciplinary drifting Observatory for the Study of Arctic Climate (MOSAiC) expedition provided a unique opportunity to study seasonal sea ice thickness changes of the same sea ice. We analyzed 11 large-scale (*50 km) airborne electromagnetic sea thickness ...

    • Thin and transient meltwater layers and false bottoms in the Arctic sea ice pack-Recent insights on these historically overlooked features 

      Smith, Madison M.; Muilwijk, Morven; Chierici, Melissa; Fer, Ilker; Fransson, Agneta; Gardner, Jessie; Granskog, Mats; Müller, Oliver; Salganik, Evgenii; Angot, He´le`ne; Chamberlain, Emelia J.; Droste, Elise S.; Karam, Salar; Webb, Alison L.; Archer, Stephen D.; Beck, Ivo; Blomquist, Byron W.; Bowman, Jeff; Boyer, Matthew; Bozzato, Deborah; Creamean, Jessie; D’Angelo, Alessandra; Delille, Bruno; Fong, Allison A.; Fuchs, Niels; Hoppe, Clara J. M.; Hoppema, Mario; Hoppmann, Mario; Mock, Thomas; Muller, Sofia; Nicolaus, Marcel; Nomura, Daiki; Petääja, Tuukka; Schmale, Julia; Schmidt, Katrin; Schulz, Kirstin M.; Shupe, Matthew D.; Stefels, Jacqueline; Thielke, Linda; Tippenhauer, Sandra; Ulfsbo, Adam; van Leeuwe, Maria; Webster, Melinda; Yoshimura, Masaki; Zhan, Liyang (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-09-07)
      The rapid melt of snow and sea ice during the Arctic summer provides a significant source of low-salinity meltwater to the surface ocean on the local scale. The accumulation of this meltwater on, under, and around sea ice floes can result in relatively thin meltwater layers in the upper ocean. Due to the small-scale nature of these upper-ocean features, typically on the order of 1 m thick or less, ...