A numerical study on the formation of upwelling off northeast Taiwan

Chau Ron Wu, Hung Fu Lu, Shenn Yu Chao

Research output: Contribution to journalArticle

57 Citations (Scopus)

Abstract

We examined the spatial and temporal variations of upwelling off northeast Taiwan, using a fine-resolution numerical model with realistic bathymetry. The zonally running shelf break in the area deflects the Kuroshio seaward and produces upwelling on its onshelf edge. The upwelling, in turn, manifests a cold dome or a cyclonic eddy. In depths below 150 m or so, the upwelling and hence the cyclonic eddy exist year-round. Above this depth, the eddy waxes and wanes as the upper portion of the Kuroshio migrates seaward and shoreward, respectively. The eddy event fluctuates in a wide range of timescales. Seasonally, the occurrence heavily favors summer rather than winter, because the mean Kuroshio axis migrates seaward in summer. Intraseasonally, the fluctuation contains two dominant periods centered at 70 days and 30 days. Local wind forcing and channeling by two local canyons do not affect the eddy statistics significantly.

Original languageEnglish
Article numberC08025
JournalJournal of Geophysical Research: Oceans
Volume113
Issue number8
DOIs
Publication statusPublished - 2008 Aug 8

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Bathymetry
Waxes
Domes
upwelling water
Taiwan
Numerical models
eddy
upwelling
Statistics
vortices
summer
canyons
waxes
temporal variation
spatial variation
statistics
winter
bathymeters
wind forcing
shelf break

ASJC Scopus subject areas

  • Geophysics
  • Forestry
  • Oceanography
  • Aquatic Science
  • Ecology
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Palaeontology

Cite this

A numerical study on the formation of upwelling off northeast Taiwan. / Wu, Chau Ron; Lu, Hung Fu; Chao, Shenn Yu.

In: Journal of Geophysical Research: Oceans, Vol. 113, No. 8, C08025, 08.08.2008.

Research output: Contribution to journalArticle

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