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| Titel |
Near-highway aerosol and gas-phase measurements in a high-diesel environment |
| VerfasserIn |
H. L. DeWitt, S. Hellebust, B. Temime-Roussel, S. Ravier, L. Polo, V. Jacob, C. Buisson, A. Charron, M. André, A. Pasquier, J. L. Besombes, J. L. Jaffrezo, H. Wortham, N. Marchand |
| 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 ; 15, no. 8 ; Nr. 15, no. 8 (2015-04-29), S.4373-4387 |
| Datensatznummer |
250119670
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| Publikation (Nr.) |
 copernicus.org/acp-15-4373-2015.pdf |
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| Zusammenfassung |
Diesel-powered passenger cars currently outnumber gasoline-powered cars in
many countries, particularly in Europe. In France, diesel cars represented
61% of light duty vehicles in 2011 and this percentage is still
increasing (French Environment and Energy Management Agency, ADEME).
As part of the September 2011 joint PM-DRIVE (Particulate Matter – DiRect and
Indirect on-road Vehicular Emissions) and MOCOPO (Measuring and mOdeling
traffic COngestion and POllution) field campaign, the concentration and
high-resolution chemical composition of aerosols and volatile organic carbon
species were measured adjacent to a major urban highway south of
Grenoble, France. Alongside these atmospheric measurements, detailed traffic
data were collected from nearby traffic cameras and loop detectors, which
allowed the vehicle type, traffic concentration, and traffic speed to be
quantified. Six aerosol age and source profiles were resolved using the
positive matrix factorization model on real-time high-resolution
aerosol mass spectra. These six aerosol source/age categories included a
hydrocarbon-like organic aerosol (HOA) commonly associated with primary
vehicular emissions, a nitrogen-containing aerosol with a diurnal
pattern similar to that of HOA, oxidized organic aerosol (OOA), and biomass
burning aerosol. While quantitatively separating the influence of diesel
from that of gasoline proved impossible, a low HOA : black carbon ratio, similar to
that measured in other high-diesel environments, and high levels of NOx,
also indicative of diesel emissions, were observed. Although the measurement
site was located next to a large source of primary emissions, which are
typically found to have low oxygen incorporation, OOA was found to comprise
the majority of the measured organic aerosol, and isotopic analysis showed
that the measured OOA contained mainly modern carbon, not fossil-derived
carbon. Thus, even in this heavily vehicular-emission-impacted environment,
photochemical processes, biogenic emissions, and aerosol oxidation dominated
the overall organic aerosol mass measured during most of the campaign. |
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