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| Titel |
Secondary organic aerosol formation from photooxidation of naphthalene and alkylnaphthalenes: implications for oxidation of intermediate volatility organic compounds (IVOCs) |
| VerfasserIn |
A. W. H. Chan, K. E. Kautzman, P. S. Chhabra, J. D. Surratt, M. N. Chan, J. D. Crounse, A. Kürten, P. O. Wennberg, R. C. Flagan, J. H. Seinfeld |
| 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. 9 ; Nr. 9, no. 9 (2009-05-12), S.3049-3060 |
| Datensatznummer |
250007272
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| Publikation (Nr.) |
 copernicus.org/acp-9-3049-2009.pdf |
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| Zusammenfassung |
| Current atmospheric models do not include secondary organic aerosol (SOA)
production from gas-phase reactions of polycyclic aromatic hydrocarbons
(PAHs). Recent studies have shown that primary emissions undergo oxidation in
the gas phase, leading to SOA formation. This opens the possibility that
low-volatility gas-phase precursors are a potentially large source of SOA. In
this work, SOA formation from gas-phase photooxidation of naphthalene,
1-methylnaphthalene (1-MN), 2-methylnaphthalene (2-MN), and
1,2-dimethylnaphthalene (1,2-DMN) is studied in the Caltech dual
28-m3 chambers. Under high-NOx conditions and aerosol mass
loadings between 10 and 40 μg m−3, the SOA yields (mass of SOA
per mass of hydrocarbon reacted) ranged from 0.19 to 0.30 for naphthalene,
0.19 to 0.39 for 1-MN, 0.26 to 0.45 for 2-MN, and constant at 0.31 for
1,2-DMN. Under low-NOx conditions, the SOA yields were measured to be
0.73, 0.68, and 0.58, for naphthalene, 1-MN, and 2-MN, respectively. The SOA
was observed to be semivolatile under high-NOx conditions and
essentially nonvolatile under low-NOx conditions, owing to the higher
fraction of ring-retaining products formed under low-NOx conditions.
When applying these measured yields to estimate SOA formation from primary
emissions of diesel engines and wood burning, PAHs are estimated to yield
3–5 times more SOA than light aromatic compounds over photooxidation
timescales of less than 12 h. PAHs can also account for up to 54% of the
total SOA from oxidation of diesel emissions, representing a potentially
large source of urban SOA. |
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