Bimodal behavior of the seasonal upwelling off the northeastern coast of Taiwan

Yu Lin Chang*, Chau Ron Wu, Lie Yauw Oey

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

29 Citations (Scopus)


Observations over the outer shelf and shelf break off the northeastern coast of Taiwan indicate a curious seasonal variability of upwelling. At deeper levels 100 m below the surface, upwelling is most intense in summer but weaker in winter. Nearer the surface at approximately 30 m below the surface, the opposite is true and the upwelling is stronger in winter than in summer. Results from a high-resolution numerical model together with observations and simple Ekman models are used to explain the phenomenon. It is shown that the upwelling at deeper levels (∼100 m) is primarily induced by offshore (summer) and onshore (winter) migrations of the Kuroshio, while monsoonal change in the wind stress curl, positive in winter and negative in summer, is responsible for the reversal in the seasonal variation of the upwelling near the surface (∼30 m). This mechanism reconciles previous upwelling data.

Original languageEnglish
Article numberC03027
JournalJournal of Geophysical Research: Oceans
Issue number3
Publication statusPublished - 2009 Mar 8

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Oceanography


Dive into the research topics of 'Bimodal behavior of the seasonal upwelling off the northeastern coast of Taiwan'. Together they form a unique fingerprint.

Cite this