Thermal Radiation Homework: Snow-Covered Surface Absorption

[annedi]

Homework Statement

Consider a snow-covered surface. Assume that the amount of solar radiation that reaches the top of the atmosphere is 1367 Wm-2. Given that 50% of this solar radiation is either absorbed in the atmosphere or reflected by clouds before reaching the the snow covered surface, how much of the original shortwave radiation is absorbed by the snow?

Homework Equations

Hr= (Area)(e)(5.67x10^-8 W/m^2K^4)(temperature)^4

The Attempt at a Solution

I seriously don't know how to.. please help me..

 

[Bystander]

What is "emissivity" of snow?

 

[annedi]

What is "emissivity" of snow?

I searched it. it says that it ranges from 0.969 - 0.997