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Volume 15, issue 12
Atmos. Chem. Phys., 15, 6767-6774, 2015
https://doi.org/10.5194/acp-15-6767-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.
Atmos. Chem. Phys., 15, 6767-6774, 2015
https://doi.org/10.5194/acp-15-6767-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 18 Jun 2015

Research article | 18 Jun 2015

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

K. Kodera1,2, B. M. Funatsu3,4, C. Claud4, and N. Eguchi5 K. Kodera et al.
  • 1Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya, Japan
  • 2Climate and Ecosystems Dynamics Division, Mie University, Tsu, Japan
  • 3LETG-Rennes COSTEL, Université Rennes 2, Rennes, France
  • 4Laboratoire de Météorologie Dynamique/IPSL, CNRS, Ecole Polytechnique, Palaiseau, France
  • 5Research Institute for Applied Mechanics, Kyushu University, Kasuga, Japan

Abstract. 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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The the role of deep convection in stratosphere–troposphere dynamical coupling in the tropics was studied during two large major stratospheric sudden warming events in January 2009 and January 2010. 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.
The the role of deep convection in stratosphere–troposphere dynamical coupling in the tropics...
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