Discussion
Which resolution allows convection to be represented explicitly?
Answer: B
Convection permitting models run at grid spacings of about one kilometre, which resolves the largest updraughts well enough to dispense with a deep convection scheme, though shallow convection is still parameterised. At 100 metres the model becomes large eddy simulation, resolving the turbulence within the cloud as well, which remains too expensive for operational forecasting over any large domain. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.
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