Stratospheric HBr concentration profile obtained from far-infrared emission spectroscopy (original) (raw)

Abstract

Hydrogen bromide (HBr) is the principal bromine sink species for the ozone loss chemistry induced by brominecontaining gases in the stratosphere. We report a 1994 balloon-based measurement of the daytime stratospherie HBr profile between 20 and 36.5 km altitude. The average concentration result of 1.31 + 0.39 parts per trillion in volume (pptv) and an analysis for the concentration versus altitude profile are consistent with previously reported measurements. These results strengthen the evidence for a significantly higher H]3r concentration than that predicted by current photochemical models which, on the basis of recent kinetics results, do not include significant Hl3r production by the reaction branch, BrO + HO2 --) HBr + 03.

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