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

Yi Chia Hsin, Tangdong Qu, Chau-Ron Wu

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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.

Original languageEnglish
Pages (from-to)1293-1306
Number of pages14
JournalOcean Dynamics
Issue number5
Publication statusPublished - 2010 Oct 1



  • Intra-seasonal variation
  • Kuroshio southeast of Taiwan

ASJC Scopus subject areas

  • Oceanography

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