The role of convective overshooting clouds in tropical stratosphere-troposphere dynamical coupling

K. Kodera, B. M. Funatsu, C. Claud, N. Eguchi

研究成果: ジャーナルへの寄稿学術誌査読

16 被引用数 (Scopus)

抄録

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.

本文言語英語
ページ(範囲)6767-6774
ページ数8
ジャーナルAtmospheric Chemistry and Physics
15
12
DOI
出版ステータス出版済み - 6月 18 2015

!!!All Science Journal Classification (ASJC) codes

  • 大気科学

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