Discussion
Which known deficiency does quasi-geostrophic theory have at fronts?
Answer: A
Because advection is by the geostrophic wind alone, the ageostrophic contribution that actually completes the collapse is missing, so quasi-geostrophic frontogenesis is far too gentle. Semi-geostrophic theory, which advects by the geostrophic momentum, repairs this and gives frontal collapse in finite time. The failure is a matter of intensity rather than of position or direction. A limit that survives making every external component ideal is an intrinsic one, and worth knowing for that reason.
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