On the longitudinal shifts of the Agulhas retroflection point

扫码查看

原文链接

万方数据
维普

外文摘要：The Agulhas system is the strongest western boundary current system in the Southern Hemisphere and plays an important role in modulating the Indian-to-Atlantic Ocean water exchange by the Agulhas leakage.It is difficult to measure in situ transport of the Agulhas leakage as well as the Agulhas retroflection position due to their intermittent nature.In this study,an innovative kinematic algorithm was designed and applied to the gridded altimeter observational data,to ascertain the longitudinal position of Agulhas retroflection,the stability of Agulhas jet stream,as well as its strength.The results show that the east-west shift of retroflection is related neither to the strength of Agulhas current nor to its stability.Further analysis uncovers the connection between the westward extension of Agulhas jet stream and an anomalous cyclonic circulation at its northern side,which is likely attributed to the local wind stress curl anomaly.To confirm the effect of local wind forcing on the east-west shift of retroflection,numerical sensitivity experiments were conducted.The results show that the local wind stress can induce a similar longitudinal shift of the retroflection as altimetry observations.Further statistical and case study indicates that whether an Agulhas ring can continuously migrate westward to the Atlantic Ocean or re-merge into the main flow depends on the retroflection position.Therefore,the westward retroflection may contribute to a stronger Agulhas leakage than the eastward retroflection.

外文关键词：

Agulhas systemAgulhas leakageretroflection positionlocal wind stress curl

作者：

Weiwei Zhang、Xiaoyi Yang、Wei Zhuang、Xiaohai Yan

展开 >

作者单位：

State Key Laboratory of Marine Environmental Science,College of Ocean and Earth Sciences,Xiamen University,Xiamen 361002,China

Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai),Zhuhai 519082,China

Center for Remote Sensing,College of Earth,Ocean and Environment,University of Delaware,Newark,DE 19716,USA

Joint Center for Remote Sensing,University of Delaware-Xiamen University,Newark,DE 19716,USA and Xiamen 361002,China

展开 >

基金：

National Key R&D Program of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Science FoundationNational Aeronautics and Space Administration

项目编号：

2019YFA060670242176222918582024163096341776003NSF-IIS-2123264NASA-80NSSC20M0220

出版年：

2024

DOI：

10.1007/s13131-023-2295-x

海洋学报(英文版)

中国海洋学会

海洋学报(英文版)

CSTPCD

影响因子：0.323

ISSN：0253-505X

年,卷(期)：2024.43(5)