Discussion
A weather chart shows isobars over the ocean packed twice as closely as over the adjacent land.
What can be inferred about the geostrophic wind?
Answer: B
The geostrophic wind is proportional to the pressure gradient, so halving the isobar spacing doubles the wind. Surface roughness affects the actual wind by adding friction, but the geostrophic value is defined by the pressure field alone. Temperature enters only weakly through density, and on a constant pressure chart it does not enter at all. Reading wind speed from isobar spacing is one of the oldest and most useful skills in practical meteorology.
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