Discussion
Which practical use has the geostrophic momentum approximation?
Answer: B
Replacing the actual momentum by the geostrophic momentum in the acceleration term gives the semi-geostrophic equations, which describe frontogenesis far better than the quasi-geostrophic system does. The cross-frontal ageostrophic circulation is retained and the fronts sharpen realistically. Coriolis is certainly retained, and neither gravity wave filtering nor density removal is what the approximation accomplishes. A limit that survives making every external component ideal is an intrinsic one, and worth knowing for that reason.
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