Discussion
Which sign does cyclonic vorticity have in the northern hemisphere?
Answer: B
Anticlockwise rotation gives positive vorticity in the standard convention, and cyclonic means anticlockwise in the northern hemisphere, so cyclonic vorticity is positive there. In the southern hemisphere cyclonic means clockwise and therefore negative vorticity, which is why the word cyclonic is safer than any statement about sign. A circular flow certainly has vorticity, since the fluid elements themselves are rotating as they go round. Framing the question as which quantity the change acts upon makes the answer follow without calculation.
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