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《大气科学进展(英文版)》 2010-02
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Direct Climatic Effect of Dust Aerosol in the NCAR Community Atmosphere Model Version 3 (CAM3)

YUE Xu 1,2,3 , WANG Huijun 1,2 , LIAO Hong 4,1 , and FAN Ke 2 1 Climate Change Research Center, Chinese Academy of Sciences, Beijing 100029 2 Nansen-Zhu International Research Center (NZC), Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029 3 Graduate University of the Chinese Academy of Sciences, Beijing 100049 4 State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029  
Direct climate responses to dust shortwave and longwave radiative forcing (RF) are studied using the NCAR Community Atmosphere Model Version 3 (CAM3). The simulated RF at the top of the atmosphere (TOA) is-0.45 W m-2 in the solar spectrum and +0.09 W m-2 in the thermal spectrum on a global average. The magnitude of surface RF is larger than the TOA forcing, with global mean shortwave forcing of-1.76 W m-2 and longwave forcing of +0.31 W m-2 . As a result, dust aerosol causes the absorption of 1.1 W m-2 in the atmosphere. The RF of dust aerosol is predicted to lead to a surface cooling of 0.5 K over the Sahara Desert and Arabian Peninsula. In the meantime, the upper troposphere is predicted to become warmer because of the absorption by dust. These changes in temperature lead to a more stable atmosphere, which results in increases in surface humidity. The upward sensible and latent heat fluxes at the surface are reduced, largely balancing the surface energy loss caused by the backscattering and absorption of dust aerosol. Precipitation is predicted to decrease moderately on a global scale.
【Fund】: supported by the Key Project of Chinese Academy of Sciences under Grant KZCX2-YW-Q11-03;; supported by the National Basic Research Program of China (“973” program) under Grant2006CB403705;; the Key Project of Chinese Academy of Sciences under Grants KZCX2-YW-Q1-02 KZCX2-YW-205 and KZCX2-YW-219;; the National Natural Science Foundation of China under Grant No. 40631005
【CateGory Index】: P401;X513
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