| Trends of Lower- to Mid-Stratospheric Water Vapor Simulated in Chemistry-Climate Models |
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| 作者姓名： | HU Ding-Zhu HAN Yuan-Yuan SANG Wen-Jun XIE Fei |
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| 作者单位： | College of Atmospheric Sciences, Lanzhou University;College of Global Change and Earth System Science, Beijing Normal University |
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| 摘 要： | Using the outputs from 16 chemistry-climate models(CCMs), the trends of lower- to mid-stratospheric water vapor(WV) during the period 1980–2005 were studied. Comparisons were made between the CCM results and European Centre for Medium-Range Weather Forecasts(ECMWF) Interim Reanalysis(ERA-Interim).The results of most of the CCMs, and those based on ERA-Interim, showed the trends of lower- to mid-stratospheric WV during the period 1980–2005 to be positive, with the extent of the trend increasing with altitude. The trend of lower- to mid-stratospheric WV in the ensemble mean of the CCMs was 0.03 ppmv per decade,which was about twice as large as that based on ERA-Interim. The authors also used a state-of-the-art general circulation model to evaluate the impacts of greenhouse gas(GHG) concentration increases and ozone depletion on stratospheric WV. The simulation results showed that the increases of lower- to mid-stratospheric WV affected by the combined effects of GHG and ozone changes happened mainly via warming of the tropopause and enhancement of the Brewer-Dobson circulation(BDC), with the former being the greater contributor.GHG increase led to a higher and warmer tropopause with stronger BDC, which in turn led to more WV entering the stratosphere; while ozone depletion led to a higher and cooler tropopause, which caused the decreases of lowerto mid-stratospheric WV, despite also causing stronger BDC.
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| 关 键 词： | ozone contributor stronger greenhouse depletion warming Brewer Medium ECMWF entering |
Trends of Lower-to Mid-Stratospheric Water Vapor Simulated in Chemistry-Climate Models |
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| HU Ding-Zhu,HAN Yuan-Yuan,SANG Wen-Jun,XIE Fei.Trends of Lower- to Mid-Stratospheric Water Vapor Simulated in Chemistry-Climate Models[J].Atmospheric and Oceanic Science Letters,2015,8(1):57-62. |
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| Authors: | HU Ding-Zhu HAN Yuan-Yuan SANG Wen-Jun XIE Fei |
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| Institution: | 1. College of Atmospheric Sciences, Lanzhou University, Lanzhou 730000, China
2. College of Global Change and Earth System Science, Beijing Normal University, Beijing 100875, China |
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| Abstract: | |
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| Keywords: | chemistry-climate model stratospheric water vapor tropopause Brewer-Dobson circulation greenhouse gas ozone |
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