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| Titel |
Investigative modeling of new pathways for secondary organic aerosol formation |
| VerfasserIn |
B. K. Pun, C. Seigneur |
| 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. 9 ; Nr. 7, no. 9 (2007-05-03), S.2199-2216 |
| Datensatznummer |
250004945
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| Publikation (Nr.) |
 copernicus.org/acp-7-2199-2007.pdf |
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| Zusammenfassung |
| Recent advances in secondary organic aerosol (SOA) research are reviewed and
the status of current understanding is investigated using a box model of SOA
formation. Benzene and isoprene are newly identified precursors that are
included in this SOA model; these precursors form SOA via secondary
products. The model is also extended to include some representation of
aqueous partitioning and the formation of high molecular weight products via
oligomerization. Experimental data and empirical relationships are used
where possible, because a detailed representation of SOA formation is not
supported by the current state of information. Sensitivity studies are
conducted with the SOA model and SOA predictions are found to be very
sensitive to the treatment of the interactions between particulate water and
organic compounds. While uncertainties due to model formulation are
significant, influential model parameters include the aerosol partitioning
ratios for several small products of isoprene and the partitioning constants
for unidentified products (currently, the partitioning constants are derived
by fitting experimental data). The pH value used as the reference for the
activation of oligomerization is also a critical parameter. Recommendations
for future work needed to improve SOA models include the elucidation of the
water-organic relationship, the extent of phase separation, and laboratory
experiments conducted under conditions more relevant to ambient studies
(e.g., lower concentrations, higher relative humidity). |
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