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Pathways of basal meltwater from Antarctic ice shelves: A model study

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タイトル: Pathways of basal meltwater from Antarctic ice shelves: A model study
著者: Kusahara, Kazuya 著作を一覧する
Hasumi, Hiroyasu 著作を一覧する
キーワード: Antarctic ice shelves
ice shelf basal meltwater
virtual tracer experiments
発行日: 2014年 9月
出版者: American Geophysical Union
誌名: Journal of Geophysical Research, Oceans
巻: 119
号: 9
開始ページ: 5690
終了ページ: 5704
出版社 DOI: 10.1002/2014JC009915
抄録: We investigate spreading pathways of basal meltwater released from all Antarctic ice shelves using a circumpolar coupled ice shelf-sea ice-ocean model that reproduces major features of the Southern Ocean circulation, including the Antarctic Circumpolar Current (ACC). Several independent virtual tracers are used to identify detailed pathways of basal meltwaters. The spreading pathways of the meltwater tracers depend on formation sites, because the meltwaters are transported by local ambient ocean circulation. Meltwaters from ice shelves in the Weddell and Amundsen-Bellingshausen Seas in surface/subsurface layers are effectively advected to lower latitudes with the ACC. Although a large portion of the basal meltwaters is present in surface and subsurface layers, a part of the basal meltwaters penetrates into the bottom layer through active dense water formation along the Antarctic coastal margins. The signals at the seafloor extend along the topography, showing a horizontal distribution similar to the observed spreading of Antarctic Bottom Water. Meltwaters originating from ice shelves in the Weddell and Ross Seas and in the Indian sector significantly contribute to the bottom signals. A series of numerical experiments in which thermodynamic interaction between the ice shelf and ocean is neglected regionally demonstrates that the basal meltwater of each ice shelf impacts sea ice and/or ocean thermohaline circulation in the Southern Ocean.
Rights: Copyright 2014 American Geophysical Union.
資料タイプ: article
出現コレクション:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

提供者: 草原 和弥


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