Discussion
Which circulation is maintained as a residual of the eddy fluxes?
Answer: A
The Ferrel cell is thermally indirect, with cold air rising and warm air sinking, and it exists only because the eddy fluxes force it, which is why it appears in the zonal mean but corresponds to no coherent physical circulation. The Hadley cell is thermally direct and drives itself. The Walker and Brewer-Dobson circulations belong to the tropics and the stratosphere respectively. Checking the units of each quantity catches a wrong formula before the arithmetic begins.
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