Activities of 50-80 day subthermocline eddies near the Philippine coast

Tzu Ling Chiang, Chau Ron Wu, Tangdong Qu, Yi Chia Hsin

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Analyses of outputs from an eddy-resolving ocean general circulation model show that there are at least two groups of subthermocline eddies near the Philippine coast: one originates from the southeast, and the other from the east. The dominant period and principal depth of the former (latter) group of eddies are about 55 days (67 days) and 600 m (350 m), respectively. The propagation speed (∼0.12 m s-1) and diameter (∼3°) of the two groups of eddies are similar. We suggest that the westward propagating eddies are generated by interactions between meridional movement of the westward-flowing North Equatorial Current, the eastward-flowing North Equatorial Undercurrent, and their interactions with topography. Besides, the analysis indicates that, in comparison with the northwestward propagating subthermocline eddies, the westward propagating ones play a more important role in modulating the subsurface circulation near the Philippine coast.

Original languageEnglish
Pages (from-to)3606-3623
Number of pages18
JournalJournal of Geophysical Research: Oceans
Volume120
Issue number5
DOIs
Publication statusPublished - 2015 May 1

Keywords

  • ocean GCM
  • subthermocline eddies
  • undercurrent
  • western boundary current

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

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