By setting the incoming and outgoing energy fluxes that you picked out equal to each other, we can write that L (1-α) / 4 = ε σ T(layer 2)4. Use a value of L of 1350 W/m2, α of 30%, ε = 1, and σ = 5.67 x 10-8 W/(m2 K4)?
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Nigerian Meteorological Agency