Land-falling typhoons are controlled by the meridional oscillation of the Kuroshio Extension

Shihming Huang, Lie Yauw Oey

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

Low-frequency variations of typhoon paths are often attributed to changes in the North Pacific subtropical high and monsoon through influences on the steering wind. Evidence indicates however a strong imprint of the Kuroshio on the atmosphere. Here we show that the meridional oscillation of sea surface temperature (SST) front over the Kuroshio Extension east of Japan significantly correlates with the number of land-falling typhoons along East Asia from June to October, accounting for 70% of the low-frequency variance since 1980. We used observations and a simple model to show that when the SST front shifts poleward (equatorward), SST gradient south of the current and westerly tropospheric wind weaken (strengthen), steering more typhoons to veer toward (away from) the East Asian continent. Our analysis also indicates that long-term weakening of SST gradient and westerly wind appears to be concomitant with poleward shifting of the Kuroshio, attributed to global warming in some studies, and suggests the potential for more land-falling typhoons in East Asia in the coming decades.

Original languageEnglish
Pages (from-to)2855-2867
Number of pages13
JournalClimate Dynamics
Volume52
Issue number5-6
DOIs
StatePublished - 15 Mar 2019

Keywords

  • Air-sea coupling
  • Kuroshio Extension
  • SST front
  • Steering flow
  • Typhoons

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