Discussion
Which term in the vorticity equation is usually largest for synoptic flow?
Answer: B
The divergence or stretching term, the product of absolute vorticity and horizontal divergence, dominates the synoptic vorticity budget because convergence concentrates existing vorticity very effectively. Tilting matters mainly at convective scales, the solenoidal term is small in pressure coordinates, and friction is confined to the boundary layer. Recognising which term leads is what allows the equation to be simplified usefully. The shared properties explain why these belong to one family, and the differences explain why more than one exists.
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