References

ACP

Atmospheric Chemistry and Physics

ACP

1680-7324

Copernicus GmbH

Göttingen, Germany

10.5194/acp-7-661-2007

Seasonal variation of PM10 main constituents in two valleys of the French Alps. I: EC/OC fractions

Aymoz

¹ ⁴ Jaffrezo

J. L.

¹ Chapuis

² Cozic

¹ ⁵ Maenhaut

Laboratoire de Glaciologie et Géophysique de l'Environnement, 54 rue Molière, 38402 Saint Martin D'Hères Cedex, France

L'Air de l'Ain et des Pays de Savoie (Air-APS), 430 rue de la Belle Eau, ZI des Landiers Nord, 73000 Chambéry, France

Department of Analytical Chemistry, Institute for Nuclear Sciences, Ghent University, Proeftuinstraat 86, BE-9000 Gent, Belgium

now at: INERIS, Parc technologique Alata, BP 2, 60550 Verneuil-en-Halatte, France

now at: Paul Scherrer Institute (PSI), CH-5232 Villigen, Switzerland

09 02 2007

7 3 661 675

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.

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Daily PM10 samples were collected at two urban sites within two valleys in the French Alps (Chamonix and St Jean de Maurienne) during a period of two and a half years. The carbonaceous species EC (elemental carbon) and OC (organic carbon) were analysed to investigate the possible sources of EC and OC, and their seasonal variations. Mean OC concentrations are in the very high range of concentrations measured for other European sites, and represent at least one third of the PM10 mass on each site. On the basis of the comparison between EC and OC concentrations with several tracers, we were able to show that their main sources are local primary combustion sources. Biomass burning emissions (residential heating) have a significant impact on OC concentrations while heavy duty traffic emissions have an impact only on EC concentrations. Finally, we estimated the contribution of SOA (secondary organic carbon) to OC, using the EC-to-OC primary ratio method (Castro et al., 1999) and demonstrated that the calculation of SOA mass with this method is highly uncertain, if the hypothesis of a constant primary EC-to-OC ratio is not very closely examined.

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