Upper-tropospheric Vortex Street and its Formation Mechanism

• Maejima Yasumitsu

  Ocean Research Institute, The University of Tokyo

• Iga Keita

  Ocean Research Institute, The University of Tokyo

• Niino Hiroshi

  Ocean Research Institute, The University of Tokyo

抄録

Upper-tropospheric vortices having a horizontal wavelength of 300-400 km were observed on water vapor images of the Japanese geostationary satellite (MTSAT-1). Grid point values predicted by the Regional Spectral Model of the Japan Meteorological Agency show that the vortices were located along a zonal belt with strong cyclonic shear and horizontal convergence. A quasi-geostrophic linear stability analysis of the basic flow having horizontal and vertical shear shows that the fastest growing mode has a horizontal wavelength, a phase speed and a growth rate that reasonably agree with those of the satellite observation. The amplitude of the fastest growing mode is confined to a region having a meridional width of 2 degrees and a vertical depth of 2 km. An energy budget analysis shows that barotropic instability is the dominant generation mechanism for the growing mode.

収録刊行物

• SOLA

  SOLA 2 80-83, 2006

  公益社団法人 日本気象学会

キーワード

• Atmospheric Science

詳細情報

• CRID: 1390282680198475904
• NII論文ID: 130004448407
• DOI: 10.2151/sola.2006-021
• ISSN: 13496476
• Web Site: http://www.jstage.jst.go.jp/article/sola/2/0/2_0_80/_pdf
• 本文言語コード: en
• データソース種別:
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  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可