Reaction between CH3O2 and BrO radicals: a new source of upper troposphere lower stratosphere hydroxyl radicals

The Journal of Physical Chemistry. a
Dudley E ShallcrossCarl J Percival

Abstract

Over the last two decades it has emerged that measured hydroxyl radical levels in the upper troposphere are often underestimated by models, leading to the assertion that there are missing sources. Here we report laboratory studies of the kinetics and products of the reaction between CH3O2 and BrO radicals that shows that this could be an important new source of hydroxyl radicals:BrO + CH3O2 → products (1). The temperature dependent value in Arrhenius form of k(T) is k1 = (2.42–0.72+1.02) × 10–14 exp[(1617 ± 94)/T] cm3 molecule–1 s–1. In addition, CH2OO and HOBr are believed to be the major products. Global model results suggest that the decomposition of H2COO to form OH could lead to an enhancement in OH of up to 20% in mid-latitudes in the upper troposphere and in the lower stratosphere enhancements in OH of 2–9% are inferred from model integrations. In addition, reaction 1 aids conversion of BrO to HOBr and slows polar ozone loss in the lower stratosphere.

References

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Citations

Feb 27, 2018·Environmental Science. Processes & Impacts·M A H KhanD E Shallcross
Jan 30, 2016·Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology·UNKNOWN United Nations Environment Programme, Environmental Effects Assessment Panel
Sep 17, 2020·Physical Chemistry Chemical Physics : PCCP·Amit KumarPradeep Kumar
Oct 2, 2020·Physical Chemistry Chemical Physics : PCCP·Henry F MullHenry F Schaefer
Oct 21, 2018·Nature Communications·Rebecca L CaravanCraig A Taatjes
May 26, 2018·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Chenggang LuZhihao Fu

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