Notes and correspondence the impact of tropical tropopause cooling on sahelian extreme deep convection

Kunihiko Kodera, Nawo Eguchi, Rei Ueyama, Beatriz M. Funatsu, Marco Gaetani, Christopher M. Taylor

研究成果: Contribution to journalLetter査読

抄録

Previous studies have suggested that the recent increase in tropical extreme deep convection, in particular over Asia and Africa during the boreal summer, has occurred in association with cooling in the tropical lower strato-sphere. The present study is focused on the Sahel region of West Africa, where an increased occurrence of extreme precipitation events has been reported over recent decades. The results indicate that the changes over West Africa since the 1980s involve a cooling trend in the tropical lower stratosphere and tropopause layer, combined with warming in the troposphere. This feature is similar to that which might result from increased greenhouse-gas levels but is distinct from the interannual variation of precipitation associated with the transport of water vapor from the Atlantic Ocean. It is suggested that the decrease in the vertical temperature gradient in the tropical tropopause region enhances extreme deep convection over the Sahel, where penetrating convection is frequent, whereas tropospheric warming suppresses the shallower convection over the Guinea Coast. Therefore, the essen-tial feature of the recent changes over West Africa is the depth of convection rather than the total amount of surface precipitation.

本文言語英語
ページ(範囲)1127-1139
ページ数13
ジャーナルJournal of the Meteorological Society of Japan
99
4
DOI
出版ステータス出版済み - 2021

All Science Journal Classification (ASJC) codes

  • 大気科学

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