Discussion
A column of air moving eastward crosses a mountain range and descends into the plains beyond.
What happens to its vorticity?
Answer: D
Compression of the column as it climbs the windward slope reduces the absolute vorticity, giving anticyclonic curvature, and the subsequent stretching in the lee restores and overshoots it, giving the cyclonic lee trough. The column then oscillates downstream as a standing Rossby wave train. This sequence explains the semi-permanent lee troughs east of the Rockies and the Andes and the cyclogenesis regions associated with them. The quantity that varies and the quantity that does not are worth naming before any substitution is attempted.
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