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| Titel |
Secondary organic aerosol formation from gasoline vehicle emissions in a new mobile environmental reaction chamber |
| VerfasserIn |
S. M. Platt, I. Haddad, A. A. Zardini, M. Clairotte, C. Astorga, R. Wolf, J. G. Slowik, B. Temime-Roussel, N. Marchand, I. Ježek, L. Drinovec, G. Mocnik, O. Möhler, Rene Richter, P. Barmet, F. Bianchi, U. Baltensperger, A. S. H. Prévôt |
| 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. 18 ; Nr. 13, no. 18 (2013-09-16), S.9141-9158 |
| Datensatznummer |
250085690
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| Publikation (Nr.) |
 copernicus.org/acp-13-9141-2013.pdf |
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| Zusammenfassung |
| We present a new mobile environmental reaction chamber for the simulation of
the atmospheric aging of different emission sources without limitation from
the instruments or facilities available at any single site. Photochemistry is
simulated using a set of 40 UV lights (total power 4 KW). Characterisation
of the emission spectrum of these lights shows that atmospheric aging of
emissions may be simulated over a range of temperatures (−7 to
25 °C). A photolysis rate of NO2, JNO2, of
(8.0 ± 0.7) × 10−3 s−1 was determined at
25 °C. We demonstrate the utility of this new system by presenting
results on the aging (OH = 12 × 106 cm−3 h) of
emissions from a modern (Euro 5) gasoline car operated during a driving cycle
(New European Driving Cycle, NEDC) on a chassis dynamometer in a vehicle test
cell. Emissions from the entire NEDC were sampled and aged in the chamber.
Total organic aerosol (OA; primary organic aerosol (POA) emission + secondary organic aerosol (SOA) formation) was
(369.8–397.5)10−3 g kg−1 fuel, or
(13.2–15.4) × 10−3 g km−1, after aging, with aged
OA/POA in the range 9–15. A thorough investigation of the composition of the
gas phase emissions suggests that the observed SOA is from previously
unconsidered precursors and processes. This large enhancement in particulate matter mass from
gasoline vehicle aerosol emissions due to SOA formation, if it occurs across
a wider range of gasoline vehicles, would have significant implications for
our understanding of the contribution of on-road gasoline vehicles to ambient
aerosols. |
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