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| Titel |
Gaseous products and secondary organic aerosol formation during long term oxidation of isoprene and methacrolein |
| VerfasserIn |
L. Brégonzio-Rozier, F. Siekmann, C. Giorio, E. Pangui, S. B. Morales, B. Temime-Roussel, A. Gratien, V. Michoud, S. Ravier, M. Cazaunau, A. Tapparo, A. Monod, J.-F. Doussin |
| 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 ; 15, no. 6 ; Nr. 15, no. 6 (2015-03-17), S.2953-2968 |
| Datensatznummer |
250119552
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| Publikation (Nr.) |
 copernicus.org/acp-15-2953-2015.pdf |
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| Zusammenfassung |
| First- and higher order-generation products formed from the oxidation
of
isoprene and methacrolein with OH radicals in the presence of NOx have
been studied in a simulation chamber. Significant oxidation rates have been
maintained for up to 7 h, allowing the study of highly oxidized products.
Gas-phase product distribution and yields were obtained, and show good
agreement with previous studies. Secondary organic aerosol (SOA) formation
has also been investigated. SOA mass yields from previous studies show large
discrepancies. The mass yields obtained here were consistent with the lowest
values found in the literature, and more specifically in agreement with
studies carried out with natural light or artificial lamps with emission
similar to the solar spectrum. Differences in light source are therefore
proposed to explain partially the discrepancies observed between different
studies in the literature for both isoprene- and methacrolein-SOA mass
yields. There is a high degree of similarity between the SOA mass spectra
from isoprene and methacrolein photooxidation, thus strengthening the
importance of the role of methacrolein in SOA formation from isoprene
photooxidation under our experimental conditions (i.e., presence of NOx
and long term oxidation). According to our results, SOA mass yields from
both isoprene and methacrolein in the atmosphere could be lower than
suggested by most of the current chamber studies. |
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