Atmospheric Chemistry and Physics www.atmos-chem-phys.net 1680-7316 1680-7324 8 10 2008 10.5194/acp-8-2763-2008 http://www.atmos-chem-phys.net/8/2763/2008/ http://www.atmos-chem-phys.net/8/2763/2008/acp-8-2763-2008.html http://www.atmos-chem-phys.net/8/2763/2008/acp-8-2763-2008.pdf 2763 2771 2008-05-23 Estimation of Asian dust aerosol effect on cloud radiation forcing using Fu-Liou radiative model and CERES measurements Jing Su Jianping Huang hjp@lzu.edu.cn Qiang Fu P. Minnis Jinming Ge Jianrong Bi College of Atmospheric Science, Lanzhou University, Lanzhou, 730000, People's Republic of China Department of Atmospheric Science, University of Washington, Seattle, WA, 98195, USA NASA Langley Research Center, Hampton, VA, 23666, USA The impact of Asian dust on cloud radiative forcing during 2003–2006 is studied by using the Clouds and Earth's Radiant Energy Budget Scanner (CERES) data and the Fu-Liou radiative transfer model. Analysis of satellite data shows that the dust aerosol significantly reduced the cloud cooling effect at TOA. In dust contaminated cloudy regions, the 4-year mean values of the instantaneous shortwave, longwave and net cloud radiative forcing are −138.9, 69.1, and −69.7 Wm^−2, which are 57.0, 74.2, and 46.3%, respectively, of the corresponding values in pristine cloudy regions. The satellite-retrieved cloud properties are significantly different in the dusty regions and can influence the radiative forcing indirectly. The contributions to the cloud radiation forcing by the dust direct, indirect and semi-direct effects are estimated using combined satellite observations and Fu-Liou model simulation. The 4-year mean value of combination of dust indirect and semi-direct shortwave radiative forcing (SWRF) is 82.2 Wm^−2, which is 78.4% of the total dust effect. The dust direct effect is only 22.7 Wm^−2, which is 21.6% of the total effect. 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