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

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Abstract

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.

Original languageEnglish
Pages (from-to)297-304
Number of pages8
JournalAtmospheric Chemistry and Physics
Volume15
Issue number1
DOIs
Publication statusPublished - Jan 13 2015

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All Science Journal Classification (ASJC) codes

  • Atmospheric Science

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