Discussion
Which consequence does barotropy have for the vertical structure of the wind?
Answer: A
The thermal wind is proportional to the horizontal temperature gradient, which vanishes in a barotropic atmosphere, so the geostrophic wind is the same at every level. That is why the earliest numerical forecasts, which used a barotropic model, could represent the flow at a single level. The other options describe baroclinic situations in which the thermal wind is non-zero and oriented in various ways relative to the flow. A limit that survives making every external component ideal is an intrinsic one, and worth knowing for that reason.
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