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Title: Isoprene oxidation mechanisms: Measurements and modelling of OH and HO[subscript 2] over a South-East Asian tropical rainforest during the OP3 field campaign
Authors: Stone, D.
Evans, M.J.
Edwards, P.M.
Commane, R.
Ingham, T.
Rickard, A.R.
Brookes, D.M.
Hopkins, J.
Leigh, R.J.
Lewis, A.C.
Monks, P.S.
Oram, D.
Reeves, C.E.
Stewart, D.
Heard, D.E.
First Published: 2011
Publisher: Copernicus GmbH (Copernicus Publications) on behalf of the European Geosciences Union (EGU).
Citation: Atmospheric Chemistry and Physics, 2011, 11 (13), pp. 6749-6771
Abstract: Forests are the dominant source of volatile organic compounds into the atmosphere, with isoprene being the most significant species. The oxidation chemistry of these compounds is a significant driver of local, regional and global atmospheric composition. Observations made over Borneo during the OP3 project in 2008, together with an observationally constrained box model are used to assess our understanding of this oxidation chemistry. In line with previous work in tropical forests, we find that the standard model based on MCM chemistry significantly underestimates the observed OH concentrations. Geometric mean observed to modelled ratios of OH and HO[subscript 2] in airmasses impacted with isoprene are 5.32[subscript −4.43,superscript +3.68] and 1.18[subscript −0.30,superscript +0.30] respectively, with 68 % of the observations being within the specified variation. We implement a variety of mechanistic changes into the model, including epoxide formation and unimolecular decomposition of isoprene peroxy radicals, and assess their impact on the model success. We conclude that none of the current suggestions can simultaneously remove the bias from both OH and HO[subscript 2] simulations and believe that detailed laboratory studies are now needed to resolve this issue.
DOI Link: 10.5194/acp-11-6749-2011
ISSN: 1680-7316
eISSN: 1680-7324
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: © Author(s) 2011. This is an open-access article distributed under the terms of the Creative Commons Attribution License (, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Appears in Collections:Published Articles, Dept. of Chemistry

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