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《Chinese Journal of Geophysics》 2013-01
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Simulation of influence of N_2O's increase on atmospheric environment and comparison with the influences of methane and stratospheric water vapor

BI Yun1,XU Li1,ZHOU Ren-Jun1,CHEN Yue-Juan1,YI Ming-Jian1,DENG Shu-Mei2 1 School of Earth and Space Sciences,University of Science and Technology of China,Hefei 230026,China 2 Anhui Institute of Meteorological Sciences,Hefei 230031,China  
A sensitivity experiment,with the increasing N2O volume mixing ratio,was carried out to study the influence of an increase of N2O on O3 and temperature using the 2D interactive chemical radiative dynamical(SCORATES) model of the National Center for Atmospheric Research,and the reasons for O3 and temperature change were analyzed from chemistry,radiation and dynamical processes.Moreover,the differences in influences on the atmospheric environment of methane and water vapor increase as well as N2O increases were compared.The results show that when N2O concentration increases,the chemical process results in O3 depletion over 30 km,and the high value appear between 30 and 40 km.The cooling is obvious over 30 km,the O3 increase and slight warming appear at middle-lower latitudes in the lower stratosphere and troposphere.The extents of ozone decrease and cooling over 30~40 km are larger at middle-high latitudes in the North Hemisphere than in the South Hemisphere.The tropospheric warming is mainly caused by the increases of N2O and O3,while the temperature change in the stratosphere is mainly dominated by O3.The dynamical feedback to temperature change is more distinct at middle-high latitudes in the Northern Hemisphere than in other regions and significantly affects temperature and ozone in the middle-high stratosphere at middle-high latitudes in the Northern Hemisphere.Whereas the O3 depletion caused by methane increase appears above 45 km,and the O3 increases below 45 km.The stratospheric water vapor increase can result in the O3 depletion above 40 km,and the O3 increases in the most of between 20 and 40 km.The O3 depletion caused by N2O increase appears right near the O3 layer,and its emission is very important to the future O3 layer recovery.The slight warming caused by N2O increase appears from 15 to 25 km at middle and low latitudes,however the increase in CO2,CH4,and stratospheric water vapor can respectively lead to cooling there.
【Fund】: 国家重点基础研究发展计划(2010CB428603)资助
【CateGory Index】: P421.32
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