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| Titel |
Organic nitrate and secondary organic aerosol yield from NO3 oxidation of β-pinene evaluated using a gas-phase kinetics/aerosol partitioning model |
| VerfasserIn |
J. L. Fry, A. Kiendler-Scharr, A. W. Rollins, P. J. Wooldridge, S. S. Brown, H. Fuchs, W. Dubé, A. Mensah, M. Maso, R. Tillmann, H.-P. Dorn, T. Brauers, R. C. Cohen |
| 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. 4 ; Nr. 9, no. 4 (2009-02-23), S.1431-1449 |
| Datensatznummer |
250006936
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| Publikation (Nr.) |
 copernicus.org/acp-9-1431-2009.pdf |
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| Zusammenfassung |
| The yields of organic nitrates and of secondary organic aerosol (SOA)
particle formation were measured for the reaction NO3+β-pinene under
dry and humid conditions in the atmosphere simulation chamber SAPHIR at
Research Center Jülich. These experiments were conducted at low
concentrations of NO3 (NO3+N2O5<10 ppb) and
β-pinene (peak~15 ppb), with no seed aerosol. SOA formation was
observed to be prompt and substantial (~50% mass yield under both
dry conditions and at 60% RH), and highly correlated with organic nitrate
formation. The observed gas/aerosol partitioning of organic nitrates can be
simulated using an absorptive partitioning model to derive an estimated
vapor pressure of the condensing nitrate species of pvap~5×10−6 Torr
(6.67×10−4 Pa), which constrains
speculation about the oxidation mechanism and chemical identity of the
organic nitrate. Once formed the SOA in this system continues to evolve,
resulting in measurable aerosol volume decrease with time. The observations
of high aerosol yield from NOx-dependent oxidation of monoterpenes
provide an example of a significant anthropogenic source of SOA from biogenic hydrocarbon
precursors. Estimates of the NO3+β-pinene SOA source strength for
California and the globe indicate that NO3 reactions with monoterpenes
are likely an important source (0.5–8% of the global total) of organic
aerosol on regional and global scales. |
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