Discussion
Which term describes vertical motion forced by the boundary layer under a cyclone?
Answer: A
Convergence in the frictional layer beneath a cyclonic circulation forces air upward out of the boundary layer, with a vertical velocity proportional to the relative vorticity above. This is the mechanism by which friction spins a vortex down over a few days. Orographic lifting, entrainment and isentropic upglide are all genuine sources of vertical motion but arise from quite different causes. A single measurement chosen to respond to the one asymmetry beats several that respond to shared behaviour.
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