Overview of the MOSAiC expedition: Atmosphere

• Main Authors: Shupe, Matthew, Rex, Markus, Blomquist, Byron, Ola, P, Persson, G, Schmale, Julia, Uttal, Taneil, Althausen, Dietrich, Lè Ne Angot, Hé, Archer, Stephen, Bariteau, Ludovic, Beck, Ivo, Bilberry, John, Bucci, Silvia, Buck, Clifton, Boyer, Matt, Brasseur, Zoé, Brooks, Ian, Cassano, John, Castro, Vagner, Chu, David, Costa, David, Cox, Christopher, 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, Frey, Markus, Gallagher, Michael, Ganzeveld, Laurens, Gradinger, Rolf, Graeser, Jürgen, Greenamyer, Vernon, Griesche, Hannes, Griffiths, Steele, Hamilton, Jonathan, Heinemann, Günther, Helmig, Detlev, Herber, Andreas, Line Heuzé, Cé, Hofer, Julian
• Other Authors: Laboratoire de Météorologie Physique (LaMP), Institut national des sciences de l'Univers (INSU - CNRS)-Université Clermont Auvergne 2017-2020 (UCA 2017-2020 )-Centre National de la Recherche Scientifique (CNRS)
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2022
• Subjects: Arctic; Atmosphere; Field campaign; [SDU.OCEAN]Sciences of the Universe [physics]/Ocean; Arctic Ocean; Sea ice
• Online Access: https://hal.archives-ouvertes.fr/hal-03614449; https://hal.archives-ouvertes.fr/hal-03614449/document; https://hal.archives-ouvertes.fr/hal-03614449/file/MOSAiC_Shupe_elementa.2021.00060.pdf

International audience 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 2019 to September 2020. An international team designed and implemented the comprehensive program to document and characterize all aspects of the Arctic atmospheric system in unprecedented detail, using a variety of approaches, and across multiple scales. These measurements were coordinated with other observational teams to explore crosscutting and coupled interactions with the Arctic Ocean, sea ice, and ecosystem through a variety of physical and biogeochemical processes. This overview outlines the breadth and complexity of the atmospheric research program, which was organized into 4 subgroups: atmospheric state, clouds and precipitation, gases and aerosols, and energy budgets. Atmospheric variability over the annual cycle revealed important influences from a persistent large-scale winter circulation pattern, leading to some storms with pressure and winds that were outside the interquartile range of past conditions suggested by long-term reanalysis. Similarly, the MOSAiC location was warmer and wetter in summer than the reanalysis climatology, in part due to its close proximity to the sea ice edge.The comprehensiveness of the observational program for characterizing and analyzing atmospheric phenomena is demonstrated via a winter case study examining air mass transitions and a summer case study examining vertical atmospheric evolution. Overall, the MOSAiC atmospheric program successfully met its objectives and was the most comprehensive atmospheric measurement program to date conducted over the Arctic sea ice. The obtained data will support a broad range of coupled-system scientific research and ...