Abstract

The foreign-broadened continuum of water vapor in the ${\nu }_2$ band $(5–7.7\text{\hspace{0.17em} μm}$, $1300–2000{\mathrm{cm}}^{-1})$ is important for satellite-based retrievals of water vapor in the upper troposphere, where temperatures are below $-25°\text{C}$. Continuum coefficients have previously been measured mostly at or above $+23°\text{C}$. We present continuum coefficients in the ${\nu }_{\text{2}}$ band retrieved from measurements made in Antarctica at temperatures near $-30°\text{C}$: 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 $\text{30\%}$, corresponding to a $\text{6\%}$ relative error in retrieved upper-tropospheric humidity.

© 2006 Optical Society of America

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