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

Line mixing effects in solar occultation spectra of the lower stratosphere: measurements and comparisons with calculations for the 1932-cm⁻¹ CO₂Q branch

Curtis P. Rinsland and L. Larrabee Strow
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Line shape in the low-frequency wing of self-broadened CO₂ lines

V. Menoux, R. Le Doucen, and C. Boulet
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