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| Titel |
Secondary organic aerosol formation from biomass burning intermediates: phenol and methoxyphenols |
| VerfasserIn |
L. D. Yee, K. E. Kautzman, C. L. Loza, K. A. Schilling, M. M. Coggon, P. S. Chhabra, M. N. Chan, A. W. H. Chan, S. P. Hersey, J. D. Crounse, 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 ; 13, no. 16 ; Nr. 13, no. 16 (2013-08-21), S.8019-8043 |
| Datensatznummer |
250085636
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| Publikation (Nr.) |
 copernicus.org/acp-13-8019-2013.pdf |
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| Zusammenfassung |
| The formation of secondary organic aerosol from oxidation of phenol, guaiacol
(2-methoxyphenol), and syringol (2,6-dimethoxyphenol), major components of
biomass burning, is described. Photooxidation experiments were conducted in
the Caltech laboratory chambers under low-NOx (< 10 ppb)
conditions using H2O2 as the OH source. Secondary organic aerosol
(SOA) yields (ratio of mass of SOA formed to mass of primary organic reacted)
greater than 25% are observed. Aerosol growth is rapid and linear with the
primary organic conversion, consistent with the formation of essentially
non-volatile products. Gas- and aerosol-phase oxidation products from the
guaiacol system provide insight into the chemical mechanisms responsible for
SOA formation. Syringol SOA yields are lower than those of phenol and
guaiacol, likely due to novel methoxy group chemistry that leads to early
fragmentation in the gas-phase photooxidation. Atomic oxygen to carbon
(O : C) ratios calculated from high-resolution-time-of-flight Aerodyne
Aerosol Mass Spectrometer (HR-ToF-AMS) measurements of the SOA in all three
systems are ~ 0.9, which represent among the highest such ratios
achieved in laboratory chamber experiments and are similar to that of aged
atmospheric organic aerosol. The global contribution of SOA from intermediate
volatility and semivolatile organic compounds has been shown to be
substantial (Pye and Seinfeld, 2010). An approach to representing SOA formation from
biomass burning emissions in atmospheric models could involve one or more
surrogate species for which aerosol formation under well-controlled
conditions has been quantified. The present work provides data for such an
approach. |
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