Subgridscale Variability and Radiative Transfer

Model inaccuracy can result from treating clouds as simple parallel homogeneous clouds. This would be the case if clouds are uniformly distributed over grid cells, as is conventional. Such treatment can overestimate the Twomey effect by up to 50% (Lohmann and Feichter 2005). One way to obviate this problem is to treat grid cells as being nonuniform. A PDF-based approach can be used here to account for subgrid-scale variability in cloud cover and cloud condensate in radiative transfer through inhomogeneous cloud fields (e.g., Pincus and Klein 2000).

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