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The longwave gas optics scheme uses a total of 256 g-points (k terms) in 16 bands. The evaluation has been performed using radiative transfer with four zenith angles in each hemisphere (8-stream). The following plots evaluate fluxes and heating rates for the four CKDMIP greenhouse-gas scenarios "Present", "Preindustrial", "Glacial Maximum" and "Future". The comparison shares some of the features of the ecRad-RRTMG results, but are generally improved with less wiggles in the heating rate errors.
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The following plot evaluates the representation of the overlap of the longwave absorption by carbon dioxide, methane and nitrous oxide. In each case, the abscissa x-axis shows the top-of-atmosphere radiative forcing from perturbing a gas to either its climatic minimum or maximum value, using the ranges stated by Hogan and Matricardi (2020). These radiative forcings are computed keeping the concentrations of all other well-mixed gases at their present-day values, except for the gas on the ordinate y-axis which is perturbed to its own climatic minimum or maximum values. The performance is improved somewhat from RRTMG.
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