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To examine the performance in more detail, the following plot evaluates fluxes and heating rates in each of the 13 CKDMIP longwave bands. The performance is noticeably better than in the equivalent plot for the ecRad-RRTMG simulations. Note that the apparent errors in the first two bands are simply because the RRTMGP band boundary is 250 cm-1 internally rather than 350 cm-1.
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, found by averaging over the 50 profiles of the Evaluation-1 dataset. For the minimum and maximum concentrations, the change to mean atmospheric heating rate is also evaluated. In this case we see that RRTMGP represents the radiative forcing of all gases well, and is much better than RRTMG at representing low concentrations of methane.
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