Discussion
Which feature of a chart corresponds to a maximum of geostrophic vorticity?
Answer: D
Because vorticity is the Laplacian of the height field, it is largest where the field is most sharply concave, which is at the base of a well defined trough. A ridge crest is convex and so a vorticity minimum. Straight evenly spaced contours give zero vorticity, and a col is a saddle point where the two curvatures largely cancel. Reading vorticity from the shape of the contours rather than from a separate field is a valuable analytical habit. Reading the definition literally, rather than recalling a formula, is the reliable route through questions of this shape.
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