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《大气科学进展(英文版)》 2012-06
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A Study on Sulfate Optical Properties and Direct Radiative Forcing Using LASG-IAP General Circulation Model

LI Jiandong1,2,Zhian SUN3,LIU Yimin1,Jiangnan LI4,Wei-Chyung WANG 2,and WU Guoxiong1 1State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics,Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100029 2Atmospheric Sciences Research Center,State University of New York,Albany,New York,USA 12203 3Center for Australian Weather and Climate Research,Australian Bureau of Meteorology,Melbourne,Victoria,Australia 4Canadian Center for Climate Modeling and Analysis,University of Victoria,Victoria,British Columbia,Canada  
The direct radiative forcing(DRF) of sulfate aerosols depends highly on the atmospheric sulfate loading and the meteorology,both of which undergo strong regional and seasonal variations.Because the optical properties of sulfate aerosols are also sensitive to atmospheric relative humidity,in this study we first examine the scheme for optical properties that considers hydroscopic growth.Next,we investigate the seasonal and regional distributions of sulfate DRF using the sulfate loading simulated from NCAR CAM-Chem together with the meteorology modeled from a spectral atmospheric general circulation model(AGCM) developed by LASG-IAP.The global annual-mean sulfate loading of 3.44 mg m 2 is calculated to yield the DRF of 1.03 and 0.57 W m 2 for clear-sky and all-sky conditions,respectively.However,much larger values occur on regional bases.For example,the maximum all-sky sulfate DRF over Europe,East Asia,and North America can be up to 4.0 W m 2.The strongest all-sky sulfate DRF occurs in the Northern Hemispheric July,with a hemispheric average of 1.26 W m 2.The study results also indicate that the regional DRF are strongly affected by cloud and relative humidity,which vary considerably among the regions during different seasons.This certainly raises the issue that the biases in model-simulated regional meteorology can introduce biases into the sulfate DRF.Hence,the model processes associated with atmospheric humidity and cloud physics should be modified in great depth to improve the simulations of the LASG-IAP AGCM and to reduce the uncertainty of sulfate direct effects on global and regional climate in these simulations.
【Fund】: supported jointly by the grant from National Basic Research Program of China(Grant No.2012CB955303)and from the Office of Biological and Environmental Sciences US Department of Energy
【CateGory Index】: X513
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