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首页> 外文期刊>Geophysical Research Letters >Evidence for HBr production due to minor channel branching at mid-latitudes
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Evidence for HBr production due to minor channel branching at mid-latitudes

机译:中纬度小通道支化产生HBr的证据

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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, k(1b); or OH+BrO, k(2b). For k(1b), best agreement between modelled and observed HBr concentrations is obtained if the branching ratio increases from similar to 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 k(2b) appears to be 2-3%, if k(1a) = 0 which is comparable to the recently determined branching ratio for HCl production from the analogous chlorine reaction, OH+ClO. [References: 25]
机译:最近,Nolt等人。 [1997]提出了在20-36 km高度范围内的HBr测量值。我们将模型计算与这些测量结果进行了比较,并找到了确定的证据,证明HO2 + BrO,k(1b)产生的HBr的非零分支比;或OH + BrO,k(2b)。对于k(1b),如果支化比率从20 km处的近似0.4%增加到34 km处的约2%,而OH + BrO分支没有其他贡献,则将在建模和观察到的HBr浓度之间获得最佳一致性。但是,与高度无关的值为1%也会产生合理的结果。这个分支比例与Mellouki等人的研究相矛盾。 [1994]。对于OH + BrO,如果k(1a)= 0,则k(2b)的最佳值似乎为2-3%,这与最近确定的类似氯反应OH + ClO生产HCl的支化率相当。 [参考:25]

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