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A New CO2 Transmittance Parameterization and Its Impact on the GLA GCMThe Wu-Kaplan radiation parameterization (Krishnamurthy, 1982) used in the GLA Global Circulation Model (GCM) was improved by replacing its fixed tables of CO2 transmittance in the 15 micron band with models developed by regression on line-by-line transmittances. The transmittances between layers are modeled as products of effective sublayer transmittances. The GLA GCM was integrated for 20 days starting at OZ, January 21, 1979, using the transmittance model. In the control run the fixed table of 15 micron CO2 transmittances is used. The effect of the change of initial cooling rate is illustrated by a map of the difference of 50 mb temperature after 6 hours. The cooling is reduced over high topography, where the fixed table underestimates the transmittance, and is reduced slightly throughout the tropics and the north polar area where the stratosphere is relatively cold. Over elevated topography the surface cooling increases, also as expected. The stratospheric temperature increases over a degree in the arctic and smaller amounts over Antarctica and elsewhere. Tropospheric equilibrium temperature response is obscured by time dependent differences in synoptic disturbances.
Document ID
19850021164
Acquisition Source
Legacy CDMS
Document Type
Other
Authors
Wobus, R.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Wui, M. L. C.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Susskind, J.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 12, 2013
Publication Date
January 1, 1985
Publication Information
Publication: Res. Rev., 1983
Subject Category
Geophysics
Accession Number
85N29476
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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