Discussion
Arrange the following balances in order of increasing Rossby number of the flow they describe.
1. Cyclostrophic
2. Geostrophic
3. Gradient wind
4. Inertial
Select the correct sequence.
Answer: C
Geostrophic balance describes the smallest Rossby number, gradient wind balance a somewhat larger one where curvature matters, inertial motion a case where the pressure gradient has dropped out, and cyclostrophic balance the largest where Coriolis is negligible, giving 2, 3, 4, 1. Arranging them this way shows the family as a progression along a single parameter rather than as four unrelated results.
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