Impact of Aleutian Low activity on the STMW formation in the Kuroshio recirculation gyre region

Shusaku Sugimoto, Kimio Hanawa

Research output: Contribution to journalArticlepeer-review

32 Citations (Scopus)

Abstract

To understand the formation of North Pacific subtropical mode water (STMW) in the Kuroshio recirculation gyre region, the cause of STMW thickness variation is investigated using temperature profiles in a historically archived data set. The thickness variation is predominantly controlled by the main thermocline depth (MTD). When the main thermocline deepens (shoals), the wintertime mixed layer depth can develop (not develop), and consequently, thicker (thinner) STMW is observed in summer. The large-scale atmospheric forcing controlling the MTD is explored using a wind-driven hindcast ocean model. The MTD variation stems primarily from a baroclinic response in the ocean to the Aleutian Low (AL) activity; especially, the meridional movement of the AL exerts a remarkable influence.

Original languageEnglish
Article numberL03606
JournalGeophysical Research Letters
Volume37
Issue number3
DOIs
Publication statusPublished - 2010 Feb

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

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