Abstract

Representation of microphysical transformations due to entrainment and mixing (essentially, homogeneous versus inhomogeneous mixing) has significant impact on the evaluation of the 1st indirect effect (the Twomey effect) in shallow convective clouds. Aircraft observations and ground-based remote ... Show moreRepresentation of microphysical transformations due to entrainment and mixing (essentially, homogeneous versus inhomogeneous mixing) has significant impact on the evaluation of the 1st indirect effect (the Twomey effect) in shallow convective clouds. Aircraft observations and ground-based remote sensing suggest a complicated (and to some extent inconsistent) picture of the entrainment-related microphysical processes in these clouds. A new approach is being developed to represent locally homogeneity of mixing (i.e., the parameter α in Morrison and Grabowski 2008 double moment scheme) based on the predicted scale of subgrid-scale filaments λ, mean droplet size, grid-averaged relative humidity, and TKE. Show less