Discussion
Which quantity provides the advecting wind in the quasi-geostrophic system?
Answer: B
The defining simplification is that advection is performed by the geostrophic wind alone, while the ageostrophic wind appears only in the divergence term. This division is what makes the system tractable and also what limits it, since real frontogenesis depends on ageostrophic advection. The thermal wind is a shear rather than an advecting flow, and vertical averaging belongs to other simplified systems. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.
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