Atmospheric Kármán vortex shedding from Jeju Island, East China sea: A numerical study

Junshi Ito, Hiroshi Niino

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

A mesoscale atmospheric numerical model is used to simulate two cases of Kármán vortex shedding in the lee of Jeju Island, South Korea, in the winter of 2013. Observed cloud patterns associated with the Kármán vortex shedding are successfully reproduced. When the winter monsoon flows out from the Eurasian continent, a convective mixed layer develops through the supply of heat and moisture from the relatively warm Yellow Sea and encounters Jeju Island and dynamical conditions favorable for the formation of lee vortices are realized. Vortices that form behind the island induce updrafts to trigger cloud formation at the top of the convective boundary layer. A sensitivity experiment in which surface drag on the island is eliminated demonstrates that the formation mechanism of the atmospheric Kármán vortex shedding is different from that behind a bluff body in classical fluid mechanics.

Original languageEnglish
Pages (from-to)139-148
Number of pages10
JournalMonthly Weather Review
Volume144
Issue number1
DOIs
Publication statusPublished - 2016 Jan 1
Externally publishedYes

Keywords

  • Atm/Ocean Structure/Phenomena
  • Circulation/Dynamics
  • Convective-scale processes
  • Models and modeling, Cloud resolving models
  • Mountain waves
  • Physical meteorology and climatology
  • Valley/mountain flows
  • Vortices
  • Vorticity

ASJC Scopus subject areas

  • Atmospheric Science

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