Consider radiation in the Earth-atmosphere system, and answer the following question.If the Earth...

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Consider radiation in the Earth-atmosphere system, and answer the following question.
If the Earth experienced an increase in albedo 4% to 8%, how much incoming shortwave radiation(in W/m2, 2 is square) would be absorbed by the surface?
I don't understand and know how to solve that one problem.
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David · Accepted Answer

As earth receives the solar energy actually the cross-section of earth is taken into 
account as π*Re2 but since earth does keep rotating so actually the energy absorbed 
by earth is through total surface area i.e 4 π*Re2.
So the total incoming shortwave radiation absorbed by the earth is given as  
S*(1-α)/4 
Where S is solar constant = 1.

Consider radiation in the Earth-atmosphere system, and answer the following question. If the Earth experienced an increase in albedo 4% to 8%, how much incoming shortwave radiation(in W/m2, 2 is...

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