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| Titel |
Isoprene oxidation mechanisms: measurements and modelling of OH and HO2 over a South-East Asian tropical rainforest during the OP3 field campaign |
| VerfasserIn |
D. Stone, M. J. Evans, P. M. Edwards, R. Commane, T. Ingham, A. R. Rickard, D. M. Brookes, J. Hopkins, R. J. Leigh, A. C. Lewis, P. S. Monks, D. Oram, C. E. Reeves, D. Stewart, D. E. Heard |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 11, no. 13 ; Nr. 11, no. 13 (2011-07-14), S.6749-6771 |
| Datensatznummer |
250009914
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| Publikation (Nr.) |
 copernicus.org/acp-11-6749-2011.pdf |
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| Zusammenfassung |
| 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 HO2 in airmasses
impacted with isoprene are 5.32−4.43+3.68
and 1.18−0.30+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 HO2 simulations and believe that detailed laboratory studies are now
needed to resolve this issue. |
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