a global non-hydrostatic model study of a downward coupling through the tropical tropopause layer during a stratospheric sudden warming
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ID: 240873
2015
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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.
| Reference Key |
eguchi2015atmospherica
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|---|---|
| Authors | ;N. Eguchi;K. Kodera;T. Nasuno |
| Journal | Journal of agricultural and food chemistry |
| Year | 2015 |
| DOI |
10.5194/acp-15-297-2015
|
| URL | |
| Keywords |
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