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RRTM
(Stand-Alone
Model) / RRTMG
(GCM
Applications)
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RRTM
retains the highest accuracy relative to line-by-line results for single
column calculations, while RRTMG provides improved efficiency with minimal
loss of accuracy for GCM applications.
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Annual mean top
of the atmosphere longwave cloud forcing for the ECMWF forecast model without
RRTMG/McICA (top left contour) and with RRTMG/McICA (top right contour),
CERES observations (center contours) and differences between the models
and measurement (bottom contours). Line plots show zonal mean longwave
cloud forcing (top), and longitude plots averaged over the extra tropics
(center) and the tropics (bottom) for each model (black) and the observation
(red) (from Morcrette et al., 2007).
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Atmospheric
and Environmental Research, Inc.
131 Hartwell Avenue Lexington, Massachusetts 02421 Tel: (781) 761-2288 Fax: (781) 761-2299 
Created by Mark W. Shephard and Michael J. Iacono |