An infrared radiation routine for use in numerical atmospheric modelsPrevious methods for calculating radiative fluxes due to water vapor and CO2 absorption bands are extended to take into consideration the entire water vapor and CO2 bands, including e-type absorption in the window region and the overlapping of different absorptions. Cooling rate profiles in the water vapor bands for a tropical atmosphere were computed by a detailed line-by-line method and by a far-wing approximation method, and the error of both methods is less than 0.2 C/day. Cooling rate profiles in the 15 micron band including overlapping of CO2 absorption with water vapor were calculated by a method in which flux transmittance is computed by means of a linear expansion and the multiplication rule, and maximum errors of 0.3 C/day were found in comparison with the exact line-by-line method.
Document ID
19790037088
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Chow, M.-D. (SAI Comsystems Corp. McLean, Va., United States)
Arking, A. (NASA Goddard Space Flight Center Laboratory for Atmospheric Sciences, Greenbelt, Md., United States)