Discussion
Which deficiency of quasi-geostrophic theory does the semi-geostrophic system address?
Answer: C
Quasi-geostrophic theory advects by the geostrophic wind alone, which cannot produce the collapse to a genuine discontinuity that real frontogenesis approaches. The semi-geostrophic system includes the ageostrophic advection and reproduces frontal collapse in finite time. Vertical motion is present in quasi-geostrophic theory through the omega equation, and the beta effect can be retained if desired.
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