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Proc Natl Acad Sci U S A. 2013 Nov 5;110(45):18087-91. doi: 10.1073/pnas.1310344110. Epub 2013 Sep 30.

Stratospheric water vapor feedback.

Author information

1
Department of Atmospheric Sciences, Texas A&M University, College Station, TX 77843.

Abstract

We show here that stratospheric water vapor variations play an important role in the evolution of our climate. This comes from analysis of observations showing that stratospheric water vapor increases with tropospheric temperature, implying the existence of a stratospheric water vapor feedback. We estimate the strength of this feedback in a chemistry-climate model to be +0.3 W/(m(2)⋅K), which would be a significant contributor to the overall climate sensitivity. One-third of this feedback comes from increases in water vapor entering the stratosphere through the tropical tropopause layer, with the rest coming from increases in water vapor entering through the extratropical tropopause.

KEYWORDS:

climate change; lowermost stratosphere; overworld

PMID:
24082126
PMCID:
PMC3831493
DOI:
10.1073/pnas.1310344110
[Indexed for MEDLINE]
Free PMC Article
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