Biogeochemical Impact of Snow Cover and Cyclonic Intrusions on the Winter Weddell Sea Ice Pack
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....
Published in: | Journal of Geophysical Research: Oceans |
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Online Access: | http://hdl.handle.net/2115/70593 https://doi.org/10.1002/2017JC013288 |
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fthokunivhus:oai:eprints.lib.hokudai.ac.jp:2115/70593 2023-05-15T13:51:33+02:00 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. http://hdl.handle.net/2115/70593 https://doi.org/10.1002/2017JC013288 eng eng Wiley http://hdl.handle.net/2115/70593 Journal of Geophysical Research : Oceans, 122(12): 9548-9571 http://dx.doi.org/10.1002/2017JC013288 https://creativecommons.org/licenses/by-nc-nd/4.0/ CC-BY-NC-ND sea ice Weddell Sea Antarctica biogeochemistry winter 660 article fthokunivhus https://doi.org/10.1002/2017JC013288 2022-11-18T01:04:56Z 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. Article in Journal/Newspaper Antarc* Antarctic Antarctica ice pack Sea ice Southern Ocean Weddell Sea Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) Antarctic Southern Ocean Weddell Weddell Sea Journal of Geophysical Research: Oceans 122 12 9548 9571 |
institution |
Open Polar |
collection |
Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) |
op_collection_id |
fthokunivhus |
language |
English |
topic |
sea ice Weddell Sea Antarctica biogeochemistry winter 660 |
spellingShingle |
sea ice Weddell Sea Antarctica biogeochemistry winter 660 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 |
topic_facet |
sea ice Weddell Sea Antarctica biogeochemistry winter 660 |
description |
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. |
format |
Article in Journal/Newspaper |
author |
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. |
author_facet |
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. |
author_sort |
Tison, J.-L. |
title |
Biogeochemical Impact of Snow Cover and Cyclonic Intrusions on the Winter Weddell Sea Ice Pack |
title_short |
Biogeochemical Impact of Snow Cover and Cyclonic Intrusions on the Winter Weddell Sea Ice Pack |
title_full |
Biogeochemical Impact of Snow Cover and Cyclonic Intrusions on the Winter Weddell Sea Ice Pack |
title_fullStr |
Biogeochemical Impact of Snow Cover and Cyclonic Intrusions on the Winter Weddell Sea Ice Pack |
title_full_unstemmed |
Biogeochemical Impact of Snow Cover and Cyclonic Intrusions on the Winter Weddell Sea Ice Pack |
title_sort |
biogeochemical impact of snow cover and cyclonic intrusions on the winter weddell sea ice pack |
publisher |
Wiley |
url |
http://hdl.handle.net/2115/70593 https://doi.org/10.1002/2017JC013288 |
geographic |
Antarctic Southern Ocean Weddell Weddell Sea |
geographic_facet |
Antarctic Southern Ocean Weddell Weddell Sea |
genre |
Antarc* Antarctic Antarctica ice pack Sea ice Southern Ocean Weddell Sea |
genre_facet |
Antarc* Antarctic Antarctica ice pack Sea ice Southern Ocean Weddell Sea |
op_relation |
http://hdl.handle.net/2115/70593 Journal of Geophysical Research : Oceans, 122(12): 9548-9571 http://dx.doi.org/10.1002/2017JC013288 |
op_rights |
https://creativecommons.org/licenses/by-nc-nd/4.0/ |
op_rightsnorm |
CC-BY-NC-ND |
op_doi |
https://doi.org/10.1002/2017JC013288 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
122 |
container_issue |
12 |
container_start_page |
9548 |
op_container_end_page |
9571 |
_version_ |
1766255452828467200 |