This mathematical exercise was done to see how close calculated irradiance would come to measured irradiance and to prove that climate models using enthalpy instead of radiation or irradiation were valid.  (The CRGW (3) model is a enthalpy based model).  With the non-ideal PSL data for this task and the assumption this exercise came very close to the measured annual outgoing LW irradiation.  This gives some validity to the annual enthalpy correlations to cloud fraction and vapor pressure deficit, VPD.  used in the CRGW model.