Ocean Dynamics

, Volume 60, Issue 5, pp 1293–1306 | Cite as

Intra-seasonal variation of the Kuroshio southeast of Taiwan and its possible forcing mechanism

Article

Abstract

The intra-seasonal variation of the Kuroshio southeast of Taiwan has been studied using satellite data and a numerical model. Superimposed with the main stream of the Kuroshio, two intra-seasonal signals are revealed in the study region. The fluctuation with a period of 1–6 months results from offshore eddies. The westward propagating cyclonic eddies can reduce or reverse the northward flow east of the Kuroshio between 121° and 123° E, but only slightly touch the core velocity of the Kuroshio. The fluctuation with a period of 2–4 weeks is only significant between Taiwan and the Lan-Yu Island (the low-velocity region). Different mechanisms are responsible for the fluctuation in the low-velocity region in different seasons. In winter, the change of negative wind stress curl in the northeastern South China Sea modulates the circulation southeast of Taiwan, while the typhoon-induced intense wind is responsible for the current fluctuation in summer.

Keywords

Intra-seasonal variation Kuroshio southeast of Taiwan 

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Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  1. 1.Department of Earth SciencesNational Taiwan Normal UniversityTaipeiTaiwan
  2. 2.International Pacific Research Center, School of Ocean and Earth Science and TechnologyUniversity of HawaiiHonoluluUSA

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