Articles | Volume 19, issue 23
https://doi.org/10.5194/acp-19-14621-2019
https://doi.org/10.5194/acp-19-14621-2019
Research article
 | 
03 Dec 2019
Research article |  | 03 Dec 2019

Impact of convectively lofted ice on the seasonal cycle of water vapor in the tropical tropopause layer

Xun Wang, Andrew E. Dessler, Mark R. Schoeberl, Wandi Yu, and Tao Wang

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Latest update: 15 Jun 2024
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Short summary
We use a trajectory model to diagnose mechanisms that produce the observed and modeled tropical lower stratospheric water vapor seasonal cycle. We confirm that the seasonal cycle of water vapor is primarily determined by the seasonal cycle of tropical tropopause layer (TTL) temperatures. However, between 10° N and 40° N, we find that evaporation of convective ice in the TTL plays a key role contributing to the water vapor seasonal cycle there. The Asian monsoon region is the most important region.
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