Atmos. Chem. Phys. Discuss., 5, 9669-9690, 2005
www.atmos-chem-phys-discuss.net/5/9669/2005/
doi:10.5194/acpd-5-9669-2005
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This discussion paper has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP.
Constraining the total aerosol indirect effect in the LMDZ and ECHAM4 GCMs using MODIS satellite data
J. Quaas1,3, O. Boucher2,3, and U. Lohmann4
1Max Planck Institute for Meteorology, Hamburg, Germany
2Laboratoire d’Optique Atmosphérique, CNRS/Université des Sciences et Technologies de Lille, Villeneuve d’Ascq, France
3Hadley Centre, Met Office, Exeter, UK
4Institute for Atmospheric and Climate Science, ETH Zurich, Switzerland

Abstract. 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.

Citation: Quaas, J., Boucher, O., and Lohmann, U.: Constraining the total aerosol indirect effect in the LMDZ and ECHAM4 GCMs using MODIS satellite data, Atmos. Chem. Phys. Discuss., 5, 9669-9690, doi:10.5194/acpd-5-9669-2005, 2005.
 
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