Question

Why is the annual mean net radiation at toa downwards at low latitudes and upwards at high latitudes?

Answer 1

Averaged over the year, the net radiation at the top of the atmosphere is downward at low latitudes and upward at high latitudes. ... The former slopes steeply downward toward the poles, reflecting the strong latitudinal dependence of solar zenith angle.

Answer 2

Answer: Averaged over the year, the net radiation at the top of the atmosphere is downward at low latitudes and upward at high latitudes. ... The former slopes steeply downward toward the poles, reflecting the strong latitudinal dependence of solar zenith angle.