A Radiative Transfer Model To Analyze Radiometer Data In The Atmospheric Window

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This is a AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH report procured by the Pentagon and made available for public release. It has been reproduced in the best form available to the Pentagon. It is not spiral-bound, but rather assembled with Velobinding in a soft, white linen cover. The Storming Media report number is A349803. The abstract provided by the Pentagon follows: A radiation model was developed to calculate radiance in a plane parallel, vertically nonhomogeneous, nonscattering atmosphere. The radiance model was developed to analyze data collected by a vertically pointed radiometer with a receiver bandwidth of 9.5-11.5 micrometers. These radiometer readings are used in conjunction with backscatter readings from a vertically aligned polarization diversity lidar system to compute various cirrus cloud properties such as infrared (IR) emittance. The model used the correlated k-distribution method (CKD) to calculate absorption coefficient functions and account for the nonhomogeneity of the atmosphere. Transmittance and radiance results from this CKD model were compared with results from FASCODE3, a popular and highly accurate line-by-line (LBL) radiation model. Several different atmospheric profiles, ranging from subarctic to tropical, were compared to determine the accuracy and efficiency of the CKD model with respect to the LBL model. At the highest resolutions, the CKD model was 15-100 times faster than the LBL model. Despite the increased efficiency, the CKD model transmittance errors from the earth surface to 30 km were less than 0.4% with respect to the LBL model in temperate and arctic profiles. Errors were less than 2% in the tropical profile. The CKD model downwelling radiance errors from the surface to 30 km were less than 2% with respect to the LBL model for tropical and temperate profiles. In arctic conditions, radiance errors were as high as 8.5% below 2 km, but tapered off to 3% at cirrus cloud levels.

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