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| Titel |
Emission factor ratios, SOA mass yields, and the impact of vehicular emissions on SOA formation |
| VerfasserIn |
J. J. Ensberg, P. L. Hayes, J. L. Jimenez, J. B. Gilman, W. C. Kuster, J. A. de Gouw, J. S. Holloway, T. D. Gordon, S. Jathar, A. L. Robinson, 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 ; 14, no. 5 ; Nr. 14, no. 5 (2014-03-07), S.2383-2397 |
| Datensatznummer |
250118466
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| Publikation (Nr.) |
 copernicus.org/acp-14-2383-2014.pdf |
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| Zusammenfassung |
| The underprediction of ambient secondary organic aerosol (SOA) levels by
current atmospheric models in urban areas is well established, yet the cause
of this underprediction remains elusive. Likewise, the relative contribution
of emissions from gasoline- and diesel-fueled vehicles to the formation of
SOA is generally unresolved. We investigate the source of these two
discrepancies using data from the 2010 CalNex experiment carried out in the
Los Angeles Basin (Ryerson et al., 2013). Specifically, we use gas-phase
organic mass (GPOM) and CO emission factors in conjunction with measured
enhancements in oxygenated organic aerosol (OOA) relative to CO to quantify
the significant lack of closure between expected and observed organic aerosol
concentrations attributable to fossil-fuel emissions. Two possible
conclusions emerge from the analysis to yield consistency with the ambient
data: (1) vehicular emissions are not a dominant source of anthropogenic
fossil SOA in the Los Angeles Basin, or (2) the ambient SOA mass yields used
to determine the SOA formation potential of vehicular emissions are substantially
higher than those derived from laboratory chamber studies. |
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