This page evaluates the ecRad implementation of the RRTMG gas optics scheme operational in the ECMWF model. It is indistinguishable from version 3.9 of RRTMG available from AER. It is designed for weather and climate applications. The comparisons below use the 50 profiles of the "Evaluation-1" CKDMIP dataset. The reference calculations were performed using LBLRTM to generate the high resolution absorption spectra and the CKDMIP software to perform the radiative transfer.
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The longwave gas optics scheme uses a total of 140 g-points (k terms) in 16 bands. The evaluation has been performed using radiative transfer with four zenith angles in each hemisphere (8 -streamstreams). The following plots evaluate fluxes and heating rates for the four CKDMIP greenhouse-gas scenarios "Present", "Preindustrial", "Glacial Maximum" and "Future" (click on individual plots to expand). Generally the downwelling fluxes are unbiased, the upwelling TOA fluxes are underestimated by around 0.4 W m-2, and there are some "wiggles" in the heating rate profile 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 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 which is perturbed to its own climatic minimum or maximum values. RRTMG correctly represents the fact that carbon dioxide radiative forcing is very weakly affected by the concentrations of the other two gases. However, it over-predicts the sensitivity of methane and nitrous oxide radiative forcing to the concentrations of the other gases.
Shortwave
The shortwave RRTMG gas optics scheme uses a total of 112 g-points (k terms) in 14 bands. The following plots evaluate fluxes and heating rates for the four CKDMIP greenhouse-gas scenarios "Present", "Preindustrial", "Glacial Maximum" and "Future". Five solar zenith angles have been used with a fixed surface albedo of 0.15. The blue lines show the "raw" results from RRTMG, but since it is known that the solar spectrum is somewhat outdated in RRTMG, the fluxes in each of the 13 "narrow" CKDMIP bands have been scaled to match the more up-to-date solar spectrum used in CKDMIP - these results are in red. It can be seen that this correction substantially improves the agreement with the reference calculations.
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