ACP Atmospheric Chemistry and Physics ACP 1680-7324 Copernicus GmbH Göttingen, Germany 10.5194/acp-10-5295-2010 Inter-comparison of source apportionment models for the estimation of wood burning aerosols during wintertime in an Alpine city (Grenoble, France) Favez O. 1 7 El Haddad I. 2 Piot C. 3 4 Boréave A. 1 Abidi E. 2 Marchand N. 2 Jaffrezo J.-L. 3 Besombes J.-L. 4 Personnaz M.-B. 5 Sciare J. 6 Wortham H. 2 George C. 1 D'Anna B. 1 Université Lyon 1, Lyon, 69626, France, CNRS, UMR 5256, IRCELYON, Institut de Recherches sur la Catalyse et l'Environnement de Lyon, Villeurbanne, 69626, France Universités d'Aix-Marseille-CNRS, UMR 6264, Laboratoire Chimie Provence, Equipe Instrumentation et Réactivité Atmosphérique, Marseille, 13331, France Université Joseph Fourier-Grenoble 1-CNRS, UMR 5183, Laboratoire de Glaciologie et Géophysique de l'Environnement, Saint Martin d'Hères, 38402, France Université Savoie-Polytech'Savoie, Laboratoire de Chimie Moléculaire et Environnement, Le Bourget du lac, 73376, France Association pour le contrôle et la préservation de l'air en région grenobloise (ASCOPARG), Grenoble, 38100, France Laboratoire des Sciences du Climat et de l'Environnement, CEA-CNRS-UVSQ-IPSL, Gif sur Yvette, 91191, France now at: INERIS, DRC/CARA/CIME, Parc Technologique Alata, BP2, Verneuil-en-Halatte, 60550, France 16 06 2010 10 12 5295 5314 This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. This article is available from http://www.atmos-chem-phys.net/10/5295/2010/acp-10-5295-2010.html The full text article is available as a PDF file from http://www.atmos-chem-phys.net/10/5295/2010/acp-10-5295-2010.pdf

The emission of organic aerosols (OA) in the ambient air by residential wood burning is nowadays a subject of great scientific concern and a growing number of studies aim at apportioning the influence of such emissions on urban air quality. In the present study, results obtained using two commonly-used source apportionment models, i.e., Chemical Mass Balance (CMB, performed with off-line filter measurements) and Positive Matrix Factorization (PMF, applied to Aerosol Mass Spectrometer measurements), as well as using the recently-proposed Aethalometer model (based on the measurement of the aerosol light absorption at different wavelengths) are inter-compared. This work is performed using field data obtained during the winter season (14 to 29 January 2009) at an urban background site of a French Alpine city (Grenoble). Converging results from the different models indicate a major contribution of wood burning organic aerosols (OM<sub>wb</sub>) to the ambient aerosol organic fraction, with mean OM<sub>wb</sub> contributions to total OA of 68%, 61% and 37% for the CMB, the Aethalometer and the AMS-PMF models respectively, during the period when the three modelling studies overlapped (12 days). Quantitative discrepancies might notably be due to the overestimation of OM<sub>wb</sub> calculated by the CMB due to the loss of semi-volatile compounds from sources to receptor site, as well as to the accounting of oxidized primary wood burning organic (OPOA<sub>wb</sub>) aerosols within the Oxygenated Organic Aerosol (OOA) PMF-factor. This OOA factor accounts on average for about 50% of total OM, while non-combustion sources contribute to about 25% and 28% of total OM according to the CMB and Aethalometer models respectively. Each model suggests a mean contribution of fossil fuel emissions to total OM of about 10%. A good agreement is also obtained for the source apportionment of elemental carbon (EC) by both the CMB and the Aethalometer models, with fossil fuel emissions representing on average more than 80% of total EC.

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