Discussion
Which observation reveals thermal wind balance in a radiosonde ascent?
Answer: B
A systematic vector change of wind with height indicates a horizontal temperature gradient through the thermal wind relation, and its direction gives the orientation of the isotherms. This is why a single sounding contains information about the horizontal structure of the atmosphere. The lapse rate, the humidity and the pressure profile describe the vertical structure at that point and carry no such horizontal information. Most errors here come from carrying a result across from a neighbouring case where it does not hold.
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