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Discussion

The wind that results from an exact balance between the pressure gradient and Coriolis forces is called the _____ wind.

  • A.geostrophic
  • B.gradient wind, which retains the centrifugal term arising from the curvature of the trajectory
  • C.thermal
  • D.cyclostrophic wind, in which the pressure gradient force is balanced by the centrifugal force alone

Answer: A

The geostrophic wind is defined by the two-force balance and blows parallel to the isobars with a magnitude equal to the pressure gradient force divided by the Coriolis parameter. The gradient wind adds curvature, the cyclostrophic wind drops Coriolis, and the thermal wind is a shear rather than a wind at all. Keeping the four definitions distinct is the foundation of this whole topic.

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