Discussion
Which situation gives a thermal wind of zero?
Answer: D
A barotropic layer has no horizontal temperature gradient, so the thermal wind vanishes and the geostrophic wind is the same at top and bottom. Strong wind with no directional change still implies a thermal wind if the speed changes with height. Perpendicular isotherms and contours describe strong thermal advection rather than the absence of a thermal wind, which is very nearly the opposite of the situation described. A limit that survives making every external component ideal is an intrinsic one, and worth knowing for that reason.
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