Discussion
Which level is normally used to examine the jet stream?
Answer: D
The jet core sits near the tropopause, around 250 to 300 hectopascals in mid-latitudes, so charts at those levels display it best. Lower levels show progressively weaker westerlies because the thermal wind has not yet accumulated. The choice of level therefore follows directly from the thermal wind relation rather than being an arbitrary convention, and it shifts with season and latitude as the tropopause height changes. Framing the question as which quantity the change acts upon makes the answer follow without calculation.
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