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

Dudley E. Shallcross; Kimberley E. Leather; Asan Bacak; Ping Xiao; Edmond P.F. Lee; Maggie Ng; Kam Wah Mok; John M. Dyke; Ryan Hossaini; Martyn P. Chipperfield; M. Anwar H. Khan; Carl J. Percival

doi:10.1021/jp5108203

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

Dudley E. Shallcross, Kimberley E. Leather, Asan Bacak, Ping Xiao, Edmond P.F. Lee, Maggie Ng, Kam Wah Mok, John M. Dyke, Ryan Hossaini, Martyn P. Chipperfield, M. Anwar H. Khan, Carl J. Percival

Research output: Journal article publication › Journal article › Academic research › peer-review

20 Citations (Scopus)

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.

Original language	English
Pages (from-to)	4618-4632
Number of pages	15
Journal	Journal of Physical Chemistry A
Volume	119
Issue number	19
DOIs	https://doi.org/10.1021/jp5108203
Publication status	Published - 14 May 2015

ASJC Scopus subject areas

Physical and Theoretical Chemistry

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More information

10.1021/jp5108203

Cite this

Shallcross, D. E., Leather, K. E., Bacak, A., Xiao, P., Lee, E. P. F., Ng, M., Mok, K. W., Dyke, J. M., Hossaini, R., Chipperfield, M. P., Khan, M. A. H., & Percival, C. J. (2015). Reaction between CH₃O₂ and BrO radicals: A new source of upper troposphere lower stratosphere hydroxyl radicals. Journal of Physical Chemistry A, 119(19), 4618-4632. https://doi.org/10.1021/jp5108203

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title = "Reaction between CH3O2 and BrO radicals: A new source of upper troposphere lower stratosphere hydroxyl radicals",

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.",

author = "Shallcross, {Dudley E.} and Leather, {Kimberley E.} and Asan Bacak and Ping Xiao and Lee, {Edmond P.F.} and Maggie Ng and Mok, {Kam Wah} and Dyke, {John M.} and Ryan Hossaini and Chipperfield, {Martyn P.} and Khan, {M. Anwar H.} and Percival, {Carl J.}",

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AU - Xiao, Ping

AU - Lee, Edmond P.F.

AU - Ng, Maggie

AU - Mok, Kam Wah

AU - Dyke, John M.

AU - Hossaini, Ryan

AU - Chipperfield, Martyn P.

AU - Khan, M. Anwar H.

AU - Percival, Carl J.

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