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Journal articles
Large contribution of water-insoluble secondary organic aerosols in the region of Paris (France) during wintertime
Abstract : Near real-time measurements of carbonaceous aerosols were performed in fine aerosols for a 10-day period during winter at a suburban site of Paris (France). These measurements were performed using an OCEC Sunset Field instrument for elemental carbon (EC) and organic carbon (OC); a Particle-Into-Liquid-Sampler coupled with a Total Organic Carbon (PILS-TOC) instrument for water-soluble OC (WSOC); and a 7-lambda aethalometer for absorption. A successful comparison was performed with filter sampling performed in parallel for EC, OC, and WSOC, providing further confidence on the results obtained by the online analyzers. A modified version of the aethalometer model was used to derive hourly concentrations of 3 organic aerosol (OA) sources: fossil fuel, wood burning, and secondary. This source apportionment was validated for primary OA (fossil fuel, wood burning) using time-resolved measurements of specific tracers (including levoglucosan, water-soluble potassium and methanol for wood burning) and showed that secondary organic aerosols (SOA) were the most abundant OA species during our study. Water-soluble properties of these different OA sources were investigated from the reconstruction of experimentally determined water-soluble/insoluble OC. About 23% of WSOC was found to be of a secondary (photochemical) origin. A large fraction of SOA was assigned as water-insoluble and could originate from semi-volatile primary OA from wood burning and/or anthropogenic emissions. These results have been obtained at a typical suburban site in France and may be then representative of a larger European area. They bring new light on the commonly accepted idea that SOA is mainly water-soluble.
Mots-clés :
AEROSOLS ORGANIQUES SECONDAIRES
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https://hal-ineris.archives-ouvertes.fr/ineris-00963327
Contributor : Gestionnaire Civs <>
Submitted on : Friday, March 21, 2014 - 2:23:10 PM
Last modification on : Saturday, February 20, 2021 - 3:11:52 AM
Contributor : Gestionnaire Civs <>
Submitted on : Friday, March 21, 2014 - 2:23:10 PM
Last modification on : Saturday, February 20, 2021 - 3:11:52 AM
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