Abstract

The foreign-broadened continuum of water vapor in the ν2 band (57.7  μm, 13002000cm-1) is important for satellite-based retrievals of water vapor in the upper troposphere, where temperatures are below 25°C. Continuum coefficients have previously been measured mostly at or above +23°C. We present continuum coefficients in the ν2 band retrieved from measurements made in Antarctica at temperatures near 30°C: atmospheric transmission at South Pole Station and atmospheric emission at Dome C. The continuum coefficients derived from these measurements are generally in agreement with the widely used Mlawer, Tobin–Clough, Kneizys, Davies continuum. Differences are at most 30%, corresponding to a 6% relative error in retrieved upper-tropospheric humidity.

© 2006 Optical Society of America

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