Discussion
Which of the following is not a term in the synoptic vorticity equation?
Buoyancy
Advection
Stretching
Tilting
Answer: B
Buoyancy appears in the vertical momentum equation rather than in the vorticity equation, where its effect enters indirectly through the vertical velocity in the stretching and tilting terms. Advection, stretching and tilting are genuine terms, along with the solenoidal and frictional contributions. Keeping the inventories of the different equations separate prevents a common confusion when they are first written out together. Most errors here come from carrying a result across from a neighbouring case where it does not hold.
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