Discussion
Consider the following pairs of balance and regime.
Geostrophic - straight large-scale flow
Gradient wind - curved large-scale flow
Cyclostrophic - tornado
Hydrostatic - horizontal momentum
How many of the pairs given above are correctly matched?
Answer: B
Only the final pairing is wrong: hydrostatic balance concerns the vertical momentum equation, not the horizontal one. The other three correctly associate each balance with the regime in which it applies. Learning the four balances as a set, each with its neglected term and its characteristic Rossby number, gives a compact framework into which almost every result in this subject can be placed.
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