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A GCM Parameterization of Ice Particle Mean Effective Sizes for High Latitude Cirrus Clouds and It's Comparison with Mid-Latitude Parameterization

Single-scattering properties of ice clouds depend on both ice water content (IWC) and effective size of cloud particles (Fu 1996; Fu et al. 1998). However, only the IWC information is provided in numerical models. Stephens et al. (1990) showed that the ice cloud feedback on a CO2 warming simulation could be either positive or negative depending on the value of the ice particle size assumed. Parameterizations of ice particle sizes for mid-latitude and tropical cirrus clouds appear in recent literatures but little is done for high latitude ice clouds. Herein we present a parameterization of ice particle mean effective sizes for high latitude ice clouds and a comparison with mid-latitude one.