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

Tison, J.-L.; Schwegmann, S.; Dieckmann, G.; Rintala, J.-M.; Meyer, H.; Moreau, S.; Vancoppenolle, M.; Nomura, D.; Engberg, S.; Blomster, L. J.; Hendricks, S.; Uhlig, C.; Luhtanen, A.-M.; de Jong, J.; Janssens, J.; Carnat, G.; Zhou, J.; Delille, B.

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

Tison, J.-L.; Schwegmann, S.; Dieckmann, G. et al.

Journal of Geophysical Research : Oceans, 2017, 122(12), 9548-9571

Permalink : https://hdl.handle.net/2115/70593

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アクセス権	open access
URI	https://hdl.handle.net/2115/70593
タイトル	Biogeochemical Impact of Snow Cover and Cyclonic Intrusions on the Winter Weddell Sea Ice Pack
著者	Tison, J.-L. ; Schwegmann, S. ; Dieckmann, G. ; Rintala, J.-M. ; Meyer, H. ; Moreau, S. ; Vancoppenolle, M. ; Nomura, D. ; Engberg, S. ; Blomster, L. J. ; Hendricks, S. ; Uhlig, C. ; Luhtanen, A.-M. ; de Jong, J. ; Janssens, J. ; Carnat, G. ; Zhou, J. ; Delille, B.
著者名 Tison, J.-L.
著者名 Schwegmann, S.
著者名 Dieckmann, G.
著者名 Rintala, J.-M.
著者名 Meyer, H.
著者名 Moreau, S.
著者名 Vancoppenolle, M.
e-Rad_Researcher 70550739 著者名 Nomura, D.
著者名 Engberg, S.
著者名 Blomster, L. J.
著者名 Hendricks, S.
著者名 Uhlig, C.
著者名 Luhtanen, A.-M.
著者名 de Jong, J.
著者名 Janssens, J.
著者名 Carnat, G.
著者名 Zhou, J.
著者名 Delille, B.
言語	英語
キーワード	sea ice
	Weddell Sea
	Antarctica
	biogeochemistry
	winter
発行日	2017-12-08
出版者	Wiley
収録物名	Journal of Geophysical Research : Oceans
巻(号)	122(12)
ページ	9548-9571
抄録	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.
資源タイプ	学術雑誌論文
出版タイプ	Version of Record
権利情報	Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
PISSN	2169-9275
EISSN	2169-9291
関連情報 (isIdenticalTo)	出版社版DOI https://doi.org/10.1002/2017JC013288