دورية أكاديمية
Biogeochemical Impact of Snow Cover and Cyclonic Intrusions on the Winter Weddell Sea Ice Pack
| العنوان: | Biogeochemical Impact of Snow Cover and Cyclonic Intrusions on the Winter Weddell Sea Ice Pack |
|---|---|
| المؤلفون: | 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 |
| المساهمون: | FOCUS - Freshwater and OCeanic science Unit of reSearch - ULiège |
| المصدر: | Journal of Geophysical Research. Oceans, 122 (12), 9548--9571 (2017) |
| بيانات النشر: | Wiley, 2017. |
| سنة النشر: | 2017 |
| مصطلحات موضوعية: | Biogeochemistry, Sea ice, Weddell Sea, Antarctica, winter, Physical, chemical, mathematical & earth Sciences, Earth sciences & physical geography, Physique, chimie, mathématiques & sciences de la terre, Sciences de la terre & géographie physique |
| الوصف: | 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. |
| نوع الوثيقة: | journal article http://purl.org/coar/resource_type/c_6501 article |
| اللغة: | English |
| Relation: | http://dx.doi.org/10.1002/2017JC013288; urn:issn:2169-9275; urn:issn:2169-9291 |
| DOI: | 10.1002/2017JC013288 |
| URL الوصول: | https://orbi.uliege.be/handle/2268/219831 |
| حقوق: | open access http://purl.org/coar/access_right/c_abf2 info:eu-repo/semantics/openAccess |
| رقم الأكسشن: | edsorb.219831 |
| قاعدة البيانات: | ORBi |
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