Reference : Biogeochemical Impact of Snow Cover and Cyclonic Intrusions on the Winter Weddell Sea...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Earth sciences & physical geography
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. [> >]
Hendrickx, S []
Uhlig, C. []
Luhtanen, A.-M. []
de Jong, J. []
Janssens, J. []
Carnat, G. []
Zhou, J. []
Delille, Bruno mailto [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO) >]
Journal of Geophysical Research. Oceans
Yes (verified by ORBi)
[en] Biogeochemistry ; Sea ice ; sea ice ; Weddell Sea ; Antarctica ; biogeochemistry ; winter
[en] 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.
Freshwater and OCeanic science Unit of reSearch - FOCUS
Fonds de la Recherche Scientifique (Communauté française de Belgique) - F.R.S.-FNRS ; Politique Scientifique Fédérale (Belgique) = Belgian Federal Science Policy

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