Discussion
Which level typically separates low level convergence from upper level divergence?
Answer: D
In a typical developing system convergence occupies the lower troposphere and divergence the upper, with the change of sign at a level of non-divergence around 500 to 600 hectopascals. That level is where the barotropic vorticity equation is most nearly valid, which is why 500 hectopascals was chosen for the earliest numerical forecasts. The tropopause lies well above the divergence maximum rather than at the transition. Checking the units of each quantity catches a wrong formula before the arithmetic begins.
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