Chemical characterization of submicron regional background aerosols in the western Mediterranean using an Aerosol Chemical Speciation Monitor

Autor: Minguillón, M. C., Ripoll, A., Pérez, N., Prévôt, A. S. H., Canonaco, F., Querol, X., Alastuey, A.
Přispěvatelé: Ministerio de Economía y Competitividad (España), European Commission, Generalitat de Catalunya, Consejo Superior de Investigaciones Científicas (España)
Rok vydání: 2015
Předmět:
Zdroj: Atmospheric Chemistry and Physics
Digital.CSIC. Repositorio Institucional del CSIC
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Atmospheric Chemistry and Physics, Vol 15, Iss 11, Pp 6379-6391 (2015)
Digital.CSIC
DOAJ-Articles
Atmospheric Chemistry and Physics, 15 (11)
ISSN: 1680-7324
DOI: 10.5194/acp-15-6379-2015
Popis: An Aerosol Chemical Speciation Monitor (ACSM, Aerodyne Research Inc.) was deployed at the Montseny (MSY; 41° 46′46″ N, 02° 21′29″ E, 720 m a.s.l.) regional background site in the western Mediterranean, Spain, from June 2012 to July 2013 to measure real-time inorganic (nitrate, sulfate, ammonium and chloride) and organic submicron aerosol concentrations. Co-located measurements, including real-time submicron particulate matter (PM1) and black carbon (BC) concentrations, and off-line PM1 chemical analysis were also carried out. This is one of the few studies that compare ACSM data with off-line PM1 measurements, avoiding the tail of the coarse mode included in the PM2.5 fraction. The ACSM + BC concentrations agreed with the PM1 measurements, and a strong correlation was found between the concentrations of ACSM species and the off-line measurements, although some discrepancies remain unexplained. Results point to a current underestimation of the relative ionization efficiency (RIE) established for organic aerosol (OA), which should be revised in the future. The OA was the major component of submicron aerosol (53% of PM1), with a higher contribution in summer (58% of PM1) than in winter (45% of PM1). Source apportionment of OA was carried out by applying positive matrix factorization (PMF), using the multilinear engine (ME-2) to the organic mass spectral data matrix. Three sources were identified in summer: hydrocarbon-like OA (HOA), low-volatile oxygenated OA (LV-OOA), and semi-volatile oxygenated OA (SV-OOA). The secondary OA (SOA; 4.8 μg m-3, sum of LV-OOA and SV-OOA) accounted for 85% of the total OA, and its formation during daytime (mainly SV-OOA) was estimated to be 1.1 μg m-3. In winter, HOA was also identified (12% of OA), a contribution from biomass burning OA (BBOA) was included and it was not possible to differentiate between two different SOA factors, but a single oxygenated OA (OOA) factor was resolved. The OOA contribution represented 60% of the total OA, with a degree of oxidation higher than both OOA summer factors. An intense wildfire episode was studied, obtaining a region-specific BBOA profile.
This study was supported by the Spanish Ministry of Economy and Competitiveness and FEDER funds under the project PRISMA (CGL2012-39623-C02-1), by the Generalitat de Catalunya (AGAUR 2014 SGR33 and the DGQA) and by the European Union Seventh Framework Programme (FP7/2007–2013) through ACTRIS (grant agreement no 262254). M. C. Minguillón was partially funded by the JAE-Doc CSIC program, co-funded by the European Social Fund (ESF). A. Ripoll was partially funded by a PhD grant from the Spanish Ministry of Economy and Competitiveness through the CARIATI (CGL2008-06294/CLI) project.
EUR 1,044 APC fee funded by the EC FP7 Post-Grant Open Access Pilot
Databáze: OpenAIRE
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