Abstract
An infrared radiometer has been developed for measurement of water vapor content in the stratosphere. The instrument observes atmospheric emission in the strong water vapor rotational lines beyond 40-μm wavelength and at two zenith angles of 45° and 70°. The method automatically compensates for instrumental gain change. A Golay cell is used as detector, and the instrument has been flown on balloons to a maximum altitude of 27 km. Results obtained so far over Australia indicate a dry lower stratosphere with water vapor values in the 1–3 ppm range and a mean value of 2.1 ppm at 20 km, but on one occasion a wet layer (∼6 ppm) was observed near 20-km altitude.
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