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The following provides the same band-wise evaluation but after correcting the incoming shortwave in each band to match the values used in the reference calculations, where the substantial improvement in the important 29000-38000 cm-1 band is apparent. There are also shortcomings in other bands, but see the results for RTE-RRTMGP, which show much improved performance in each longwave band.
The following plot compares the instantaneous radiative forcing (change to net flux) at top-of-atmosphere and the surface, from perturbing the concentrations of individual well-mixed greenhouse gases from their present-day values. It has been found by averaging over the 50 profiles of the Evaluation-1 dataset, and averaging over the five solar zenith angles; therefore these forcings correspond to daytime only. The CFCs have a tiny shortwave effect so have been excluded. For the minimum and maximum concentrations, the change to mean atmospheric heating rate is also evaluated. In this case we see that RRTMG tends to underestimate the radiative forcing from changes to carbon dioxide and methane, and does not represent the shortwave effect of nitrous oxide at all.
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