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

Nawo Eguchi, K. Kodera, T. Nasuno

Research output: Contribution to journalArticle

10 Citations (Scopus)

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

Fingerprint

tropopause
stratosphere
planetary wave
meridional circulation
cumulus
troposphere
amplification
parameterization
upwelling
warming
heating
sudden stratospheric warming
winter
simulation
temperature

All Science Journal Classification (ASJC) codes

  • Atmospheric Science

Cite this

A global non-hydrostatic model study of a downward coupling through the tropical tropopause layer during a stratospheric sudden warming. / Eguchi, Nawo; Kodera, K.; Nasuno, T.

In: Atmospheric Chemistry and Physics, Vol. 15, No. 1, 13.01.2015, p. 297-304.

Research output: Contribution to journalArticle

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