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| Titel |
Mass yields of secondary organic aerosols from the oxidation of α-pinene and real plant emissions |
| VerfasserIn |
L. Q. Hao, S. Romakkaniemi, P. Yli-Pirilä, J. Joutsensaari, A. Kortelainen, J. H. Kroll, P. Miettinen, P. Vaattovaara, P. Tiitta, A. Jaatinen, M. K. Kajos, J. K. Holopainen, J. Heijari, J. Rinne, M. Kulmala  , D. R. Worsnop, J. N. Smith, A. Laaksonen |
| 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. 4 ; Nr. 11, no. 4 (2011-02-16), S.1367-1378 |
| Datensatznummer |
250009353
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| Publikation (Nr.) |
 copernicus.org/acp-11-1367-2011.pdf |
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| Zusammenfassung |
| Biogenic volatile organic compounds (VOCs) are a significant source of
global secondary organic aerosol (SOA); however, quantifying their aerosol
forming potential remains a challenge. This study presents smog chamber
laboratory work, focusing on SOA formation via oxidation of the emissions of
two dominant tree species from boreal forest area, Scots pine (Pinus sylvestris L.) and
Norway spruce (Picea abies), by hydroxyl radical (OH) and ozone (O3). Oxidation of
α-pinene was also studied as a reference system. Tetramethylethylene
(TME) and 2-butanol were added to control OH and O3 levels, thereby
allowing SOA formation events to be categorized as resulting from either
OH-dominated or O3-initiated chemistry. SOA mass yields from α-pinene
are consistent with previous studies while the yields from the real
plant emissions are generally lower than that from α-pinene, varying
from 1.9% at an aerosol mass loading of 0.69 μg m−3 to 17.7%
at 26.0 μg m−3. Mass yields from oxidation of real plant emissions
are subject to the interactive effects of the molecular structures of plant
emissions and their reaction chemistry with OH and O3, which lead to
variations in condensable product volatility. SOA formation can be
reproduced with a two-product gas-phase partitioning absorption model in
spite of differences in the source of oxidant species and product volatility
in the real plant emission experiments. Condensable products from
OH-dominated chemistry showed a higher volatility than those from
O3-initiated systems during aerosol growth stage. Particulate phase
products became less volatile via aging process which continued after input
gas-phase oxidants had been completely consumed. |
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