Movement of the Kuroshio axis to the northeast shelf of Taiwan during typhoon events

Akihiko Morimoto, Shoichiro Kojima, Sen Jan, Daisuke Takahashi

Research output: Contribution to journalArticle

36 Citations (Scopus)

Abstract

We investigated the movement of the Kuroshio axis on the northeast shelf of Taiwan associated with the passage of typhoons, using sea surface current data observed by the ocean radar system on Yonaguni and Ishigaki islands. First, we examined daily Kuroshio axis variation on the northeast shelf of Taiwan during typhoon events. The ocean radar data showed that the Kuroshio axis moved onto the shelf after passages of typhoons. The Kuroshio moved onto the shelf and stayed there after the passage of Typhoon Hai-Tang; while the Kuroshio maintained this pattern, southerly wind blew continuously for 4 days. The mean current speed northeast of Taiwan after the typhoon's passage increased by 18 cm s-1. In addition, the sea level difference between two satellite altimetry tracks east of Taiwan increased by 14.4 cm. These results suggest that coastal upwelling east of Taiwan caused by the southerly wind generated an east-west sea level difference that, in turn, generated a northward geostrophic current. This current could have enhanced the Kuroshio east of Taiwan, and pushed it onto the shelf.

Original languageEnglish
Pages (from-to)547-552
Number of pages6
JournalEstuarine, Coastal and Shelf Science
Volume82
Issue number3
DOIs
Publication statusPublished - 2009 Apr 30

Keywords

  • East China Sea
  • Kuroshio
  • Taiwan
  • current direction
  • cyclones
  • geostrophic currents
  • remote sensing

ASJC Scopus subject areas

  • Oceanography
  • Aquatic Science

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