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| Titel |
Two years of near real-time chemical composition of submicron aerosols in the region of Paris using an Aerosol Chemical Speciation Monitor (ACSM) and a multi-wavelength Aethalometer |
| VerfasserIn |
J.-E. Petit, O. Favez, J. Sciare, V. Crenn, R. Sarda-Estève, N. Bonnaire, G. Mocnik, J.-C. Dupont, M. Haeffelin, E. Leoz-Garziandia |
| 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. 6 ; Nr. 15, no. 6 (2015-03-17), S.2985-3005 |
| Datensatznummer |
250119554
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| Publikation (Nr.) |
 copernicus.org/acp-15-2985-2015.pdf |
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| Zusammenfassung |
| Aerosol mass spectrometer (AMS) measurements have been successfully used towards a better
understanding of non-refractory submicron (PM1) aerosol chemical
properties based on short-term campaigns. The recently developed Aerosol
Chemical Speciation Monitor (ACSM) has been designed to deliver quite similar
artifact-free chemical information but for low cost, and to perform robust
monitoring over long-term periods. When deployed in parallel with real-time
black carbon (BC) measurements, the combined data set allows for a
quasi-comprehensive description of the whole PM1 fraction in near real
time. Here we present 2-year long ACSM and BC data sets, between mid-2011 and
mid-2013, obtained at the French atmospheric SIRTA supersite that is
representative of background PM levels of the region of Paris. This large
data set shows intense and time-limited (a few hours) pollution events
observed during wintertime in the region of Paris, pointing to local
carbonaceous emissions (mainly combustion sources). A non-parametric wind
regression analysis was performed on this 2-year data set for the major
PM1 constituents (organic matter, nitrate, sulfate and source apportioned BC) and ammonia in order to better
refine their geographical origins and assess local/regional/advected
contributions whose information is mandatory for efficient mitigation strategies. While ammonium
sulfate typically shows a clear advected pattern, ammonium nitrate partially
displays a similar feature, but, less expectedly, it also exhibits a
significant contribution of regional and local emissions. The contribution of
regional background organic aerosols (OA) is
significant in spring and summer, while a more pronounced local origin is
evidenced during wintertime, whose pattern is also observed for BC
originating from domestic wood burning. Using time-resolved ACSM and BC
information, seasonally differentiated weekly diurnal profiles of these
constituents were investigated and helped to identify the main parameters
controlling their temporal variations (sources, meteorological parameters).
Finally, a careful investigation of all the major pollution episodes observed
over the region of Paris between 2011 and 2013 was performed and classified
in terms of chemical composition and the BC-to-sulfate ratio used here as a
proxy of the local/regional/advected contribution of PM. In conclusion, these
first 2-year quality-controlled measurements of ACSM clearly demonstrate
their great potential to monitor on a long-term basis aerosol sources and
their geographical origin and provide strategic information in near real time
during pollution episodes. They also support the capacity of the ACSM to be
proposed as a robust and credible alternative to filter-based sampling
techniques for long-term monitoring strategies. |
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