Constraining the total aerosol indirect effect in the LMDZ and ECHAM4 GCMs using MODIS satellite data

被引:170
作者
Quaas, J [1 ]
Boucher, O
Lohmann, U
机构
[1] Max Planck Inst Meteorol, Hamburg, Germany
[2] Univ Sci & Technol Lille, CNRS, Opt Atmospher Lab, Villeneuve Dascq, France
[3] Met Off, Hadley Ctr, Exeter, Devon, England
[4] Swiss Fed Inst Technol, Inst Atmospher & Climate Sci, Zurich, Switzerland
关键词
D O I
10.5194/acp-6-947-2006
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Aerosol indirect effects are considered to be the most uncertain yet important anthropogenic forcing of climate change. The goal of the present study is to reduce this uncertainty by constraining two different general circulation models (LMDZ and ECHAM4) with satellite data. We build a statistical relationship between cloud droplet number concentration and the optical depth of the fine aerosol mode as a measure of the aerosol indirect effect using MODerate Resolution Imaging Spectroradiometer (MODIS) satellite data, and constrain the model parameterizations to match this relationship. We include here "empirical" formulations for the cloud albedo effect as well as parameterizations of the cloud lifetime effect. When fitting the model parameterizations to the satellite data, consistently in both models, the radiative forcing by the combined aerosol indirect effect is reduced considerably, down to -0.5 and -0.3 Wm(-2), for LMDZ and ECHAM4, respectively.
引用
收藏
页码:947 / 955
页数:9
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