Instability driven by settling and evaporation in a shear flow: a model for asperitas clouds
S. Ravichandran,
Rama Govindarajan
Abstract:We study, by direct numerical simulations in two and three dimensions, the instability caused by the settling and evaporation of water droplets out of a cloudy layer saturated with vapour into a dry sub-cloud ambient, under conditions where mammatus clouds were shown to form by [1], but with the addition of background shear. We show that shear changes the type of cloud formation qualitatively, from mammatus-like to a newly identified cloud type called asperitas. Intermediate levels of shear are shown to be nee… Show more
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