Chemistry of OClO in the Antarctic stratosphere: Implications for bromine

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Observations of OClO over Antarctica in the spring of 1986 (Solomon et al., 1987a, J. geopihys. Res.92, 8329) are used to place constraints on the abundance of stratospheric bromine. Production of OClO is thought to be due mainly to reaction of ClO with BrO. The observed diurnal variation is consistent with this source only if a fraction of the overall ClO+BrO reaction, between 3.5% and 14%, is assumed to result in production of BrCl. Otherwise the observed diurnal variation of OClO implies an additional source in twilight. The analysis suggests a concentration of stratospheric bromine of 16+/-4 pptv, consistent with independent measurements of gaseous bromine which, despite major uncertainty, indicate a range from about 5 to 20 pptv.

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