Discussion
Which of the following does not follow from hydrostatic balance?
The geostrophic wind
The hypsometric equation
The barometric formula
Pressure as a vertical coordinate
Answer: A
The geostrophic wind arises from the horizontal balance between the pressure gradient and Coriolis forces and has nothing to do with the vertical balance. The hypsometric equation, the barometric formula and the use of pressure as a vertical coordinate all follow directly from hydrostatic balance. Keeping the horizontal and vertical balances separate is essential when the results are combined, as they are in the thermal wind relation.
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