Discussion
Which latitude marks the boundary between radiative surplus and deficit?
Answer: B
The net radiation at the top of the atmosphere changes sign near 38 degrees in each hemisphere, so poleward heat transport must reach its maximum near that latitude. The observed maximum transport of about 5.5 petawatts does occur there. The tropics of Cancer and Capricorn mark the limits of overhead sun rather than the radiation balance, and 60 degrees lies well within the deficit region. Working one numerical case through both cases side by side fixes the distinction better than any rule of thumb.
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