Discussion
Which construction gives the wind at an upper level from the surface wind?
Answer: C
The thermal wind is by definition the vector difference between the geostrophic winds at two levels, so adding it to the lower level wind gives the upper level wind. Drawing this triangle on a chart is the classical way of estimating upper winds from a surface analysis and a thickness field. The density ratio and the cross-isobaric rotation address quite different questions, and no averaging construction gives the correct result. The quantity that varies and the quantity that does not are worth naming before any substitution is attempted.
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