Discussion
Which requirement for tropical cyclone formation follows from vorticity considerations?
Answer: A
Stretching amplifies existing absolute vorticity, and at the equator the planetary vorticity is zero, so there is nothing to amplify unless a substantial relative vorticity is supplied. This is why cyclones do not form within about five degrees of the equator. The other three conditions are all genuine requirements but they arise from thermodynamic and shear considerations rather than from the vorticity budget. Framing the question as which quantity the change acts upon makes the answer follow without calculation.
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