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

Shallcross, Dudley E. and Leather, Kimberley E. and Bacak, Asan and Xiao, Ping and Lee, Edmond P. F. and Ng, Maggie and Mok, Daniel K. W. and Dyke, John M. and Hossaini, Ryan and Chipperfield, Martyn P. and Khan, M. Anwar H. and Percival, Carl 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). pp. 4618-4632. ISSN 1089-5639

Full text not available from this repository.

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 k(1) = (2.42(-0.72)(+1.02)) X 10(-14) exp[(1617 +/- 94)/T] cm(3) molecule(-1) s(-1). In addition, CH2OO and HOBr are believed to he 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 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.

Item Type:
Journal Article
Journal or Publication Title:
Journal of Physical Chemistry A
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/1600/1606
Subjects:
ID Code:
82383
Deposited By:
Deposited On:
24 Oct 2016 10:54
Refereed?:
Yes
Published?:
Published
Last Modified:
24 Nov 2020 04:33