T4 T4

where f is the cloudiness factor (), e' is the net emissivity of the surface (), a is the Stefan-Boltzmann constant = 4.90 x 10-9 MJ m-2 K-4 day-1, and Tkx and Tk„ are, respectively, the maximum and minimum daily air temperatures (K).

The cloudiness factor f represents the ratio between actual net long-wave radiation and the net long-wave radiation for a clear-sky day and is computed as

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