HR: 0800h
AN: A11A-0027    [Abstracts]
TI: A modeling study of direct radiative forcing due to carbonaceous aerosol and its effects on the climate of Eastern Asia
AU: * Zhang, H
EM: huazhang@cma.gov.cn
AF: Laboratory for Climate Studies, National Climate Center, China Meteorological Administration, Beijing 100081, China, 46, Zhong-Guan-Cun-Nan-Da-Jie, Haidian District, Beijing, 100081, China
AU: Wang, Z L
EM: wangzhili1981@126.com
AF: The academy of meteorology science, Nanjing University of Information Science and Technology, Nanjing 210044, China, 114, Pan-Cheng-Xin-Jie, Pu Kou District, Nanjing, 210044, China
AU: Guo, W P
EM: guo@nuist.edu.cn
AF: The academy of meteorology science, Nanjing University of Information Science and Technology, Nanjing 210044, China, 114, Pan-Cheng-Xin-Jie, Pu Kou District, Nanjing, 210044, China
AU: Wang, Z Z
EM: wzz@cma.gov.cn
AF: Laboratory for Climate Studies, National Climate Center, China Meteorological Administration, Beijing 100081, China, 46, Zhong-Guan-Cun-Nan-Da-Jie, Haidian District, Beijing, 100081, China
AB: The global direct radiative forcing due to carbonaceous aerosol and its effects on the climate of Eastern Asian have been investigated by using CAM3 (Community Atmosphere Model Version 3) developed by the National Center for Atmospheric Research (NCAR). The simulation results in this paper show that carbonaceous aerosol brings about a negative forcing at both of the top of atmosphere (TOA) and the surface in clear sky, and the global means of the forcing are -0.24W/m2 and -1.31W/m2, respectively. However, it produces a positive radiative forcing at TOA and a weaker negative forcing at the surface in the cloudy sky, and the global means of the forcing are +0.08W/m2 and -0.96W/m2, respectively. It indicates that cloud can change the sign of the forcing at TOA, and make the negative surface forcing to be weakened. The carbonaceous aerosol has distinct effects on the climate of Eastern Asia in summer, like the total cloud cover, surface temperature and total precipitation. The atmospheric general circulation of the Northern Hemisphere can also be influenced by it. It is found in this paper that the Hadly cell is weakened and polar cell is strengthened in summer by the existing of carbonaceous aerosol. The observational fact that the precipitation is enhanced in the North part of China and is decreased in the South part of China in summer in recent years is explained by the changes of wind field and atmospheric general circulation due to carbonaceous aerosol in this work. Key wards: Carbonaceous Aerosol; Radiative Forcing; CAM3; Climate of Eastern Asia
DE: 3311 Clouds and aerosols
DE: 3319 General circulation (1223)
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting