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| Titel |
A review of Secondary Organic Aerosol (SOA) formation from isoprene |
| VerfasserIn |
A. G. Carlton, C. Wiedinmyer, J. H. Kroll |
| 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 ; 9, no. 14 ; Nr. 9, no. 14 (2009-07-27), S.4987-5005 |
| Datensatznummer |
250007528
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| Publikation (Nr.) |
 copernicus.org/acp-9-4987-2009.pdf |
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| Zusammenfassung |
| Recent field and laboratory evidence indicates that the oxidation of
isoprene, (2-methyl-1,3-butadiene, C5H8) forms secondary organic
aerosol (SOA). Global biogenic emissions of isoprene (600 Tg yr−1) are
sufficiently large that the formation of SOA in even small yields results in
substantial production of atmospheric particulate matter, likely having
implications for air quality and climate. Here we present a review of field
measurements, experimental work, and modeling studies aimed at understanding
the mechanisms, yield, and atmospheric importance of isoprene-derived SOA.
SOA yields depend on a number of factors, including organic aerosol loading
(Mo), NOx level (RO2 chemistry), and, because of the
importance of multigenerational chemistry, the degree of oxidation. These
dependences are not always included in SOA modules used in atmospheric
transport models, and instead most yield parameterizations rely on a single
set of chamber experiments (carried out over a limited range of conditions);
this may lead to very different estimates of the atmospheric importance of
isoprene SOA. New yield parameterizations, based on all available laboratory
data (Mo=0–50 μg m−3), are presented here, so that SOA
formation may be computed as a function of Mo, NOx level, and
temperature. Current research needs and future research directions are
identified. |
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