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- A43BB-2275: Stratosphere-Troposphere Exchange of Water Vapor Based on Observations and Reanalyses
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Board 2275‚ Hall EFG (Poster Hall)NOLA CC
Author(s):Generic 'disconnected' Message
Cong Dong, University of Washington Seattle (First Author, Presenting Author)
Qiang Fu, University of Washington
Water vapor in the stratosphere is important for Earth’s climate and atmospheric chemistry. Stratosphere-troposphere exchange of water vapor plays a critical role in governing stratospheric water vapor. This study offers the first quantification of this exchange using a budget approach based on observations and two widely used reanalyses. Observations show that water vapor enters the stratosphere in the tropics by 2.20 Pg/year and exits in the Northern and Southern Hemispheres extratropics by -1.16 and -0.94 Pg/year, respectively. This results in a small net gain of 0.10 Pg/year in the stratosphere, suggesting a net water vapor sink in the stratosphere. In contract, the two reanalyses yield a global net transport into the troposphere. Large discrepancies in the seasonal variation of the exchange are also identified. These differences are mainly caused by biases in the H₂O concentrations in reanalyses.
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