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Impact of increasing stratospheric water vapor on ozone depletion and temperature change
Authors:Wenshou Tian  Martyn P Chipperfield  Daren Lü
Affiliation:College of Atmospheric Science, Lanzhou University, Lanzhou 730000; Institute for Climate and Atmospheric Science, School of Earth and Environment, University of Leeds, UK;Institute for Climate and Atmospheric Science, School of Earth and Environment, University of Leeds, UK;Institute of Atmospheric Physics, Chinese Academy of Science, Beijing 100029
Abstract:Using a detailed, fully coupled chemistry climate model (CCM), the effect of increasing stratospheric H2O on ozone and temperature is investigated. Different CCM time-slice runs have been performed to investigate the chemical and radiative impacts of an assumed 2 ppmv increase in H2O. The chemical effects of this H2O increase lead to an overall decrease of the total column ozone (TCO) by ~1% in the tropics and by a maximum of 12% at southern high latitudes. At northern high latitudes, the TCO is increased by only up to 5% due to stronger transport in the Arctic. A 2-ppmv H2O increase in the model's radiation scheme causes a cooling of the tropical stratosphere of no more than 2 K, but a cooling of more than 4 K at high latitudes. Consequently, the TCO is increased by about 2%-6%. Increasing stratospheric H2O, therefore, cools the stratosphere both directly and indirectly, except in the polar regions where the temperature responds differcntly due to feedbacks between ozone and H2O changes. The combined chemical and radiative effects of increasing H2O may give rise to more cooling in the tropics and middle latitudes but less cooling in the polar stratosphere. The combined effects of H2O increases on ozone tend to offset each other, except in the Arctic stratosphere where both the radiative and chemical impacts give rise to increased ozone. The chemical and radiative effects of increasing H2O cause dynamical responses in the stratosphere with an evident hemispheric asymmetry. In terms of ozone recovery, increasing the stratospheric H2O is likely to accelerate the recovery in the northern high latitudcs and delay it in the southern high latitudes. The modeled ozone recovery is more significant between 2000-2050 than between 2050-2100, driven mainly by the larger relative change in chlorine in the earlier period.
Keywords:stratospheric water vapor  temperature change  ozone depletion  chemistry-climate model
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