Discussion
Consider the following pairs of term and its role in the vorticity equation.
Stretching - convergence concentrates vorticity
Tilting - horizontal vorticity becomes vertical
Beta - advection of planetary vorticity
Solenoidal - friction at the surface
How many of the pairs given above are correctly matched?
Answer: D
The last pairing fails: the solenoidal term arises from intersecting pressure and density surfaces and has nothing to do with surface friction, which appears as a separate dissipation term. The other three are correctly described. Knowing which term does what is what allows the equation to be simplified appropriately for a given scale of motion rather than being carried around in full.
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