Articles | Volume 16, issue 7
https://doi.org/10.5194/acp-16-4235-2016
https://doi.org/10.5194/acp-16-4235-2016
Research article
 | 
04 Apr 2016
Research article |  | 04 Apr 2016

A Lagrangian description on the troposphere-to-stratosphere transport changes associated with the stratospheric water drop around the year 2000

Fumio Hasebe and Taisuke Noguchi

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Short summary
This paper tries to answer the long-standing question in middle-atmosphere science on the mechanism of the sudden drop in stratospheric water vapor around the year 2000. Our findings indicate that the location where the air experiences cold temperature before entering the stratosphere shifted in the northern summer of 2000. It may have been led by the eastward expansion of warm water in the tropical Pacific causing the interaction of the heating between Pacific Ocean and the Tibetan Plateau.
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