Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 7 5 2007 10.5194/acpd-7-14639-2007 http://www.atmos-chem-phys-discuss.net/7/14639/2007/ http://www.atmos-chem-phys-discuss.net/7/14639/2007/acpd-7-14639-2007.html http://www.atmos-chem-phys-discuss.net/7/14639/2007/acpd-7-14639-2007.pdf 14639 14674 2007-10-15 Global anthropogenic aerosol effects on convective clouds in ECHAM5-HAM U. Lohmann ulrike.lohmann@env.ethz.ch Institute of Atmospheric and Climate Science, ETH Zurich, Universitätsstr. 16, 8092 Zurich, Switzerland Aerosols affect the climate system by changing cloud characteristics in many ways. They act as cloud condensation and ice nuclei and may have an influence on the hydrological cycle. Here we investigate aerosol effects on convective clouds by extending the double moment cloud microphysics scheme developed for stratiform clouds to convective clouds in the ECHAM5 general circulation model. 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