Ocean Dynamics

, Volume 63, Issue 5, pp 519–531 | Cite as

Evolution of an anticyclonic eddy southwest of Taiwan

  • Tingting Zu
  • Dongxiao Wang
  • Changxiang Yan
  • Igor Belkin
  • Wei Zhuang
  • Ju Chen
Article

Abstract

Satellite images of sea-surface temperature, surface chlorophyll a concentration, and sea-level anomaly, together with ocean reanalysis data of Asia and Indian–Pacific Ocean (AIPOcean1.0), are utilized to study the three-dimensional characteristics and evolution of an anticyclonic warm eddy adjacent to the southwest coast of Taiwan during October and November 2006. Originated from the Kuroshio intrusion in the Luzon Strait, but unlike previously found westward moving anticyclonic eddies (AE) in the northeastern South China Sea, this AE was so close to the Taiwan coast and stayed where it was formed for over 1 month until it dissipated. Energy analysis is utilized to study the evolution process of the AE, and it shows that the barotropic instability (BTI) and baroclinic instability introduced by the Kuroshio intrusion flow appear to be the main energy sources for the AE. Periodical enhancement/relaxation of local northeasterly monsoon and its associated negative wind stress curl modify the current patterns in this region, reinforce the intraseasonal variability of the Kuroshio intrusion flow, and act together with Kuroshio to form the AE. Eddies detected from AIPOcean1.0 data also show that AEs are most likely to be generated southwest of Taiwan during the transition period of summer monsoon to winter monsoon, and generally, the BTI of Kuroshio intrusion contributes more than the direct wind stress work to the increase of the eddy kinetic energy for the generation and growth of the AEs.

Keywords

Anticyclonic eddy Kuroshio intrusion Monsoon wind South China Sea Taiwan 

Notes

Acknowledgments

We are grateful for the two anonymous reviewers, who have provided many thoughtful comments and suggestions which led to great improvements of the manuscript. We also thank Gengxin Chen, Xiaopei Lin and Huijie Xue for their helpful discussions, and thank Huijie Xue and Changming Dong for providing their codes of energy calculation and eddy detection. This research work was supported by the 973 program (2011CB403504 and 2010CB950401) and the Guangdong Natural Science Foundation (S2011010001001).

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Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Tingting Zu
    • 1
  • Dongxiao Wang
    • 1
  • Changxiang Yan
    • 2
  • Igor Belkin
    • 3
  • Wei Zhuang
    • 1
  • Ju Chen
    • 1
  1. 1.State Key Laboratory of Tropical Oceanography, South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhouChina
  2. 2.International Center for Climate and Environmental Science, Institute of Atmospheric PhysicsChinese Academy of SciencesBeijingChina
  3. 3.Graduate School of OceanographyUniversity of Rhode IslandNarragansettUSA

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