The effect of Koshu Seamount on the formation of the Kuroshio large meander south of Japan

Takahiro Endoh, Hiroyuki Tsujino, Toshiyuki Hibiya

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

Using an inflow-outflow numerical model, the authors demonstrate that the existence of Koshu Seamount, located about 200 km to the south of Cape Shiono-misaki, is essential in creating the large meander (LM) of the Kuroshio. When Koshu Seamount is completely smoothed out, the meander trough propagates away without being amplified to form the LM. In contrast, nearly the sameLMas in the case with full topography is formed when the foot of Koshu Seamount remains without being smoothed out and also when the foot of Koshu Seamount is filled in so that the upper part of Koshu Seamount remains. A linear stability analysis applied to the model output shows that the Kuroshio becomes baroclinically most unstable when the water depth decreases offshoreward. The authors therefore conclude that the enhancement of baroclinic instability over the northern slope of Koshu Seamount is a prerequisite to the formation of the LM.

Original languageEnglish
Pages (from-to)1624-1629
Number of pages6
JournalJournal of Physical Oceanography
Volume41
Issue number9
DOIs
Publication statusPublished - Sep 2011
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Oceanography

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