Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 9 4 2009 10.5194/acpd-9-16607-2009 http://www.atmos-chem-phys-discuss.net/9/16607/2009/ http://www.atmos-chem-phys-discuss.net/9/16607/2009/acpd-9-16607-2009.html http://www.atmos-chem-phys-discuss.net/9/16607/2009/acpd-9-16607-2009.pdf 16607 16682 2009-08-07 Cirrus clouds in a global climate model with a statistical cirrus cloud scheme M. Wang minghuai.wang@pnl.gov J. E. Penner Department of Atmospheric, Oceanic, and Space Sciences, University of Michigan, USA now at: Pacific Northwest National Laboratory, Richland, Washington, USA A statistical cirrus cloud scheme that accounts for mesoscale temperature perturbations is implemented into a coupled aerosol and atmospheric circulation model to better represent both cloud fraction and subgrid-scale supersaturation in global climate models. This new scheme is able to better simulate the observed probability distribution of relative humidity than the scheme that was implemented in an older version of the model. Heterogeneous ice nuclei (IN) are shown to affect not only high level cirrus clouds through their effect on ice crystal number concentration but also low level liquid clouds through the moistening effect of settling and evaporating ice crystals. As a result, the change in the net cloud forcing is not very sensitive to the change in ice crystal concentrations associated with heterogeneous IN because changes in high cirrus clouds and low level liquid clouds tend to cancel. Nevertheless, the change in the net radiative flux at the top of the atmosphere due to changes in IN is still large because of changes in the greenhouse effect of water vapor caused by the changes in ice crystal number concentrations. 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