Abstract
Recently, Nolt et al. [1997] have presented HBr measurements over the height range 20–36 km. We have compared model calculations with these measurements and find definitive evidence for non‐zero branching ratios for HBr production from either HO2+BrO, k1b, or OH+BrO, k2b. For k1b, best agreement between modelled and observed HBr concentrations is obtained if the branching ratio increases from ∼0.4% at 20 km, to about 2% at 34 km with no additional contribution from the OH+BrO branch. However, a height‐independent value of 1% also produces reasonable results. This branching ratio contradicts the study of Mellouki et al. [1994]. For OH+BrO, the best value of k2b appears to be 2–3%, if k1a = 0 which is comparable to the recently determined branching ratio for HCl production from the analogous chlorine reaction, OH+ClO.
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