Discussion
Which situation produces vorticity with no curvature of the streamlines?
Answer: A
A perfectly straight jet has cyclonic shear vorticity on one flank and anticyclonic on the other, even though no streamline is curved. This is why the northern flank of a westerly jet in the northern hemisphere is a region of positive vorticity. Uniform flow has neither shear nor curvature, and along-flow acceleration produces divergence rather than vorticity, which is a different component of the velocity gradient. Framing the question as which quantity the change acts upon makes the answer follow without calculation.
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