Discussion
Which measurement is needed to compute the geostrophic wind from a chart?
Answer: B
Contour spacing gives the geopotential gradient and the latitude gives the Coriolis parameter, and those two quantities determine the geostrophic wind completely. Density has vanished because the chart is drawn on a pressure surface, so temperature is not required. The surface wind and the pressure tendency give other information: the former reflects friction and the latter is the source of the isallobaric wind.
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