Discussion
Which difficulty affects sea level reduction at high elevation stations?
Answer: C
For a station at two kilometres the reduction involves a column of air that does not exist, and its assumed temperature can shift the reduced value by several hectopascals. This is why analyses over mountainous regions are drawn on a constant pressure surface such as 850 hectopascals instead. The instrument works perfectly well at reduced pressure and the gravity correction is small and well determined. Working one numerical case through both cases side by side fixes the distinction better than any rule of thumb.
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