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| Titel |
Ozonolysis of α-pinene: parameterization of secondary organic aerosol mass fraction |
| VerfasserIn |
R. K. Pathak, A. A. Presto, T. E. Lane, C. O. Stanier, N. M. Donahue, S. N. Pandis |
| 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 ; 7, no. 14 ; Nr. 7, no. 14 (2007-07-24), S.3811-3821 |
| Datensatznummer |
250005140
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| Publikation (Nr.) |
 copernicus.org/acp-7-3811-2007.pdf |
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| Zusammenfassung |
| Existing parameterizations tend to underpredict the α-pinene aerosol
mass fraction (AMF) or yield by a factor of 2–5 at low organic aerosol
concentrations (<5 µg m−3). A wide range of smog chamber results
obtained at various conditions (low/high NOx, presence/absence of UV
radiation, dry/humid conditions, and temperatures ranging from 15–40°C)
collected by various research teams during the last decade are used to
derive new parameterizations of the SOA formation from α-pinene
ozonolysis. Parameterizations are developed by fitting experimental data to
a basis set of saturation concentrations (from 10−2 to 104 µg m−3)
using an absorptive equilibrium partitioning model. Separate
parameterizations for α-pinene SOA mass fractions are developed for:
1) Low NOx, dark, and dry conditions, 2) Low NOx, UV, and dry conditions, 3)
Low NOx, dark, and high RH conditions, 4) High NOx, dark, and dry
conditions, 5) High NOx, UV, and dry conditions. According to the proposed
parameterizations the α-pinene SOA mass fractions in an atmosphere
with 5 µg m−3 of organic aerosol range from 0.032 to 0.1 for
reacted α-pinene concentrations in the 1 ppt to 5 ppb range. |
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