Modeling Study of Aerosol Indirect Effects on Global Climate with an AGCM

Aerosol indirect effects （AIEs） on global climate were quantitatively investigated by introducing aerosol–cloud interaction parameterizations for water stratus clouds into an AGCM （BCC AGCM2.0.1）, which was developed by the National Climate Center of the China Meteorological Administration. The stud...

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Bibliographic Details
Published in:Advances in atmospheric sciences 2010-09, Vol.27 (5), p.1064-1077
Main Author: 王志立 张华 沈学顺 龚山陵 张小曳
Format: Article
Language:English
Subjects:
Atmospheric aerosols
Atmospheric models
Atmospheric Sciences
Climate change
Earth and Environmental Science
Earth Sciences
Geophysics/Geodesy
Meteorology
Seasons
Temperature
中国气象局
中高纬度地区
大气环流模式
季节性变化
气候模拟
气溶胶
表面温度
间接效应
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Summary:Aerosol indirect effects （AIEs） on global climate were quantitatively investigated by introducing aerosol–cloud interaction parameterizations for water stratus clouds into an AGCM （BCC AGCM2.0.1）, which was developed by the National Climate Center of the China Meteorological Administration. The study yielded a global annual mean of -1.14 W m^-2 for the first indirect radiative forcing （IRF）, with an obvious seasonal change. In summer, large forcing mainly occurred in mid to high latitudes of the Northern Hemisphere, whereas in winter, large values were found at 60°S. The second indirect effect led to global annual mean changes in net shortwave flux of -1.03 W m^-2 at the top of the atmosphere （TOA）, which was relatively significant in mid-latitude regions of both hemispheres. The total AIE reduced the global annual means of net shortwave flux at the TOA and of surface temperature by 1.93 W m^-2 and 0.12 K, respectively. Change in surface temperature induced by the total AIE was clearly larger in the Northern Hemisphere （-0.23 K） than in the Southern Hemisphere, where changes were negligible. The interhemispheric asymmetry in surface cooling resulted in significant differences in changes of the interhemispheric annual mean precipitation rate, which could lead to a tendency for the ITCZ to broaden. The total AIE decreased the global annual mean precipitation rate by 0.055 mm df^-1.
ISSN:0256-1530
1861-9533
DOI:10.1007/s00376-010-9120-5