A global non-hydrostatic model study of a downward coupling through the tropical tropopause layer during a stratospheric sudden warming

N. Eguchi, K. Kodera, T. Nasuno

研究成果: Contribution to journalArticle

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The dynamical coupling process between the stratosphere and troposphere in the tropical tropopause layer (TTL) during a∼stratospheric sudden warming (SSW) in boreal winter was investigated using simulation data from a global non-hydrostatic model (NICAM) that does not use cumulus parameterization. The model reproduced well the observed tropical tropospheric changes during the SSW, including the enhancement of convective activity following the amplification of planetary waves. Deep convective activity was enhanced in the latitude zone 20-10° S, in particular over the southwest Pacific and southwest Indian Ocean. Although the upwelling in the TTL was correlated with that in the stratosphere, the temperature tendency in the TTL changed little due to a compensation by diabatic heating originating from cloud formation. This result suggests that the stratospheric meridional circulation affects cloud formation in the TTL.

元の言語英語
ページ(範囲)297-304
ページ数8
ジャーナルAtmospheric Chemistry and Physics
15
発行部数1
DOI
出版物ステータス出版済み - 1 13 2015

All Science Journal Classification (ASJC) codes

  • Atmospheric Science

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