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| Titel |
The role of convective overshooting clouds in tropical stratosphere–troposphere dynamical coupling |
| VerfasserIn |
K. Kodera, B. M. Funatsu, C. Claud, N. Eguchi |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 15, no. 12 ; Nr. 15, no. 12 (2015-06-18), S.6767-6774 |
| Datensatznummer |
250119838
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| Publikation (Nr.) |
 copernicus.org/acp-15-6767-2015.pdf |
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| Zusammenfassung |
| This paper investigates the role of deep convection and overshooting
convective clouds in stratosphere–troposphere dynamical coupling in the
tropics during two large major stratospheric sudden warming events in
January 2009 and January 2010. During both events, convective activity and
precipitation increased in the equatorial Southern Hemisphere as a result of
a strengthening of the Brewer–Dobson circulation induced by enhanced
stratospheric planetary wave activity. Correlation coefficients between
variables related to the convective activity and the vertical velocity were
calculated to identify the processes connecting stratospheric variability to
the troposphere. Convective overshooting clouds showed a direct relationship
to lower stratospheric upwelling at around 70–50 hPa. As the tropospheric
circulation change lags behind that of the stratosphere, outgoing longwave
radiation shows almost no simultaneous correlation with the stratospheric
upwelling. This result suggests that the stratospheric circulation change
first penetrates into the troposphere through the modulation of deep
convective activity. |
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