Discussion
Which timescale characterises the adjustment of the tropical atmosphere to heating?
Answer: C
Equatorial Kelvin waves cross an ocean basin in a few days, so the atmospheric circulation adjusts to a change in the heating on that timescale. This is far faster than the ocean responds, which is why the atmosphere is usually treated as being in equilibrium with the sea surface temperature on seasonal timescales. Minutes belong to individual convective cells and years to stratospheric oscillations. A single measurement chosen to respond to the one asymmetry beats several that respond to shared behaviour.
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