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| Titel |
Yields of oxidized volatile organic compounds during the OH radical initiated oxidation of isoprene, methyl vinyl ketone, and methacrolein under high-NOx conditions |
| VerfasserIn |
M. M. Galloway, A. J. Huisman, L. D. Yee, A. W. H. Chan, C. L. Loza, J. H. Seinfeld, F. N. Keutsch |
| 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. 21 ; Nr. 11, no. 21 (2011-11-02), S.10779-10790 |
| Datensatznummer |
250010158
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| Publikation (Nr.) |
 copernicus.org/acp-11-10779-2011.pdf |
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| Zusammenfassung |
| We present first-generation and total production yields of glyoxal,
methylglyoxal, glycolaldehyde, and hydroxyacetone from the oxidation of
isoprene, methyl vinyl ketone (MVK), and methacrolein (MACR) with OH under
high NOx conditions. Several of these first-generation yields are
not included in commonly used chemical mechanisms, such as the Leeds Master
Chemical Mechanism (MCM) v. 3.2. The first-generation yield of glyoxal from
isoprene was determined to be 2.1 (±0.6)%. Inclusion of first-generation
production of glyoxal, glycolaldehyde and hydroxyacetone from isoprene
greatly improves performance of an MCM based model during the initial part of
the experiments. In order to further improve performance of the MCM based
model, higher generation glyoxal production was reduced by lowering the
first-generation yield of glyoxal from C5 hydroxycarbonyls. The results
suggest that glyoxal production from reaction of OH with isoprene under high
NOx conditions can be approximated by inclusion of a
first-generation production term together with secondary production only via
glycolaldehyde. Analogously, methylglyoxal production can be approximated by
a first-generation production term from isoprene, and secondary production
via MVK, MACR and hydroxyacetone. The first-generation yields reported here
correspond to less than 5% of the total oxidized yield from isoprene and
thus only have a small effect on the fate of isoprene. However, due to the
abundance of isoprene, the combination of first-generation yields and reduced
higher generation production of glyoxal from C5 hydroxycarbonyls is important
for models that include the production of the small organic molecules from
isoprene. |
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