Discussion
Which effect does a higher entrainment rate have on cloud depth?
Answer: B
Entraining drier cooler air reduces the buoyancy, so a strongly entraining plume loses its buoyancy at a lower level and produces a shallower cloud. Narrow plumes entrain proportionally more than wide ones, which is why small cumulus remain shallow while large ones grow deep. Schemes commonly make the entrainment rate inversely proportional to the plume radius for exactly this reason.
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