Interannual variability of the Antarctic Circumpolar Current strength based on merged altimeter data
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- 作者：LinLin Zhang (1)
Che Sun (1)
DunXin Hu (1) - 关键词：ACC strength ; interannual variability ; stream ; coordinate ; altimetry ; westerly wind
- 刊名：Chinese Science Bulletin
- 出版年：2012
- 出版时间：June 2012
- 年：2012
- 卷：57
- 期：16
- 页码：2015-2021
- 全文大小：1444KB
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Che Sun (1)
DunXin Hu (1)
1. Key Laboratory of Ocean Circulation and Waves, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, 266071, China - ISSN：1861-9541
文摘
Interannual variability of the Antarctic Circumpolar Current (ACC) strength is studied in stream-coordinate with twenty-year Absolute Dynamic Topography data from satellite altimetry. The stream-coordinate projection method separates the ACC from adjacent subtropical and subpolar gyres, enabling consideration of the zonal asymmetry of the ACC rather than assuming that the ACC is a purely zonal flow. It is shown that the ACC strength has large interannual variations with two recent peaks around 2000 and 2009. The interannual variability appears mainly in the Indo-Pacific sector of the Southern Ocean and the strongest signal is located south of Australia. The intensification of the westerly wind in 1998 and 2008 appears to cause the strengthening of the ACC via baroclinic processes.