Abstract
We have made determinations of concentration profiles of HOCl in the Earth's stratosphere, including the diurnal variation. Measurements of the rotational Q2 branch at 99.5 cm−1 and of five RR(J3) transitions between 143 and 159 cm−1 were made using far infrared thermal emission spectroscopy. The spectra were obtained during a balloon flight of the FIRS 2 far infrared Fourier transform spectrometer and telescope from Palestine, Texas, on May 12–13, 1988. From these measurements, we obtain altitude profiles of HOCl from 23 to 42 km. We present daytime and nighttime average profiles of HOCl, as well as measurements on a 30‐min time scale through the sunset transition at a single (35 km) altitude. Our measured profiles are lower than the current predictions from several modeling groups by a factor of approximately 0.6.
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