Evidence for HBr production due to minor channel branching at mid-latitudes

Details Evidence for HBr production due to minor channel branching at mid-latitudes Evidence for HBr production due to minor channel branching at mid-latitudes

Jan 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998georl..25...55c&link_type=abstract

Geophysical Research Letters, Volume 25, Issue 1, p. 55-58

Physics

4

Atmospheric Composition And Structure: Middle Atmosphere-Composition And Chemistry

Scientific paper

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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