Abstract

The effect of line mixing on the effective blackbody brightness temperature of the earth in the region of the 15-μm ν2Q branch of CO2 is calculated. The procedures used to compute line mixing follow those used to successfully model mixing observed in laboratory spectra of two near-infrared CO2Q branches. The atmospheric radiances are calculated between 664 and 670 cm−1, a spectral region that is of interest for sounding the upper troposphere and the stratosphere. Mixing was found to lower the observed brightness temperatures by as much as 3 K for some temperature profiles. Ignoring this effect would significantly impact the ability of advanced sounders to produce temperature retrievals which meet the projected accuracy requirement of 1 K/km.

© 1988 Optical Society of America

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