Convective stabilization in midlatitudes

Abstract

It is found that the convective available potential energy of the atmosphere is reduced substantially after cumulus convection, most of which is consumed during the transition from presystem to insystem. Examination of the temperature and moisture changes during cumulus convection suggests that cooling and drying in the subcloud layer are the most important factors in stabilizing the atmosphere. In general, virtual potential temperature profiles in all categories are close to reversible moist adiabats below the 600-mb level and nearly parallel to moist pseudoadiabats above it. The effect of entrainment on parcel buoyancy is also studied. It is found that a small amount of entrainment of ambient air can lead to a pronounced decrease of parcel buoyancy. -from Authors