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全球気候変動を駆動する南大洋海洋循環 : アガラスリーケージとウェッデルジャイヤ

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Title: 全球気候変動を駆動する南大洋海洋循環 : アガラスリーケージとウェッデルジャイヤ
Other Titles: Ocean circulation in the Southern Ocean driving global climate change : Agulhas leakage and Weddell gyre
Authors: 池原, 実1 Browse this author
Authors(alt): Ikehara, Minoru1
Keywords: 南大洋
Southern Ocean
Agulhas leakage
Weddell gyre
sea ice
Antarctic Circumpolar Current
Issue Date: 31-Mar-2018
Publisher: 低温科学第76巻編集委員会
Journal Title: 低温科学
Journal Title(alt): Low Temperature Science
Volume: 76
Start Page: 121
End Page: 134
Abstract: 南大洋は全球気候変動にとって重要な役割をもっている.巨大な物質リザーバである南大洋における諸現象(生物ポンプ,海洋フロント,海氷分布,表層成層化,湧昇等)の変化の理解が大気CO2 濃度変動の原因とプロセスを解き明かすために重要である.南大洋での海洋フロントの移動は,アガラスリーケージの変化を介して大西洋子午面循環の強弱に影響する.また,ウェッデルジャイヤの拡大・縮小は,南極周極流の移動とともに海氷分布域やそれらの融解スポットを変化させることから,南大洋における成層化の程度や生物ポンプの地理的多様性とそれらの変化をもたらしている.
The Southern Ocean plays a very important role in the global climate change on the present and geologic past. To resolve the causes and processes of atmospheric CO2 change, it is important to understand the mechanisms and processes of sub-systems in the Antarctic Cryosphere such as a change of biological productivity, surface water frontal system, sea-ice distribution, surface stratification, and wind-driven upwelling. Migration of the Southern Ocean fronts affects the intensity of the Atlantic Meridional Overturning Circulation (AMOC) through changes in the Agulhas leakage. In addition, expansion and reduction of the Weddell gyre changes the geographical variability and its changes of surface stratification and biological pump. These changes are derived from changing the sea ice distribution and their melting spots with migration of the Antarctic Circumpolar Current.
Type: bulletin (article)
Appears in Collections:低温科学 = Low Temperature Science > 第76巻

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