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Biogeochemical Impact of Snow Cover and Cyclonic Intrusions on the Winter Weddell Sea Ice Pack

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Title: Biogeochemical Impact of Snow Cover and Cyclonic Intrusions on the Winter Weddell Sea Ice Pack
Authors: Tison, J.-L. Browse this author
Schwegmann, S. Browse this author
Dieckmann, G. Browse this author
Rintala, J.-M. Browse this author
Meyer, H. Browse this author
Moreau, S. Browse this author
Vancoppenolle, M. Browse this author
Nomura, D. Browse this author →KAKEN DB
Engberg, S. Browse this author
Blomster, L. J. Browse this author
Hendricks, S. Browse this author
Uhlig, C. Browse this author
Luhtanen, A.-M. Browse this author
de Jong, J. Browse this author
Janssens, J. Browse this author
Carnat, G. Browse this author
Zhou, J. Browse this author
Delille, B. Browse this author
Keywords: sea ice
Weddell Sea
Issue Date: 8-Dec-2017
Publisher: Wiley
Journal Title: Journal of Geophysical Research : Oceans
Volume: 122
Issue: 12
Start Page: 9548
End Page: 9571
Publisher DOI: 10.1002/2017JC013288
Abstract: Sea ice is a dynamic biogeochemical reactor and a double interface actively interacting with both the atmosphere and the ocean. However, proper understanding of its annual impact on exchanges, and therefore potentially on the climate, notably suffer from the paucity of autumnal and winter data sets. Here we present the results of physical and biogeochemical investigations on winter Antarctic pack ice in the Weddell Sea (R. V. Polarstern AWECS cruise, June–August 2013) which are compared with those from two similar studies conducted in the area in 1986 and 1992. The winter 2013 was characterized by a warm sea ice cover due to the combined effects of deep snow and frequent warm cyclones events penetrating southward from the open Southern Ocean. These conditions were favorable to high ice permeability and cyclic events of brine movements within the sea ice cover (brine tubes), favoring relatively high chlorophyll‐a (Chl‐a) concentrations. We discuss the timing of this algal activity showing that arguments can be presented in favor of continued activity during the winter due to the specific physical conditions. Large‐scale sea ice model simulations also suggest a context of increasingly deep snow, warm ice, and large brine fractions across the three observational years, despite the fact that the model is forced with a snowfall climatology. This lends support to the claim that more severe Antarctic sea ice conditions, characterized by a longer ice season, thicker, and more concentrated ice are sufficient to increase the snow depth and, somehow counterintuitively, to warm the ice.
Type: article
Appears in Collections:水産科学院・水産科学研究院 (Graduate School of Fisheries Sciences / Faculty of Fisheries Sciences) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 野村 大樹

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