Title: Production of ozone in the Chamonix Valley (France)

Authors: Eric Chaxel, Jean-Pierre Chollet, Guillaume Brulfert, Charles Chemel

Addresses: Laboratoire des Ecoulements Geophysiques et Industriels, BP 53, 38041 Grenoble Cedex 9, France. ' Laboratoire des Ecoulements Geophysiques et Industriels, UMR 5519, Universite Joseph Fourrier, Institut National Polytechnique de Grenoble et Centre National de la Recherche Scientifique, BP 53, 38041 Grenoble Cedex 9, France. ' Laboratoire des Ecoulements Geophysiques et Industriels, UMR 5519, Universite Joseph Fourrier, Institut National Polytechnique de Grenoble et Centre National de la Recherche Scientifique, BP 53, 38041 Grenoble Cedex 9, France. ' Laboratoire des Ecoulements Geophysiques et Industriels, UMR 5519, Universite Joseph Fourrier, Institut National Polytechnique de Grenoble et Centre National de la Recherche Scientifique, BP 53, 38041 Grenoble Cedex 9, France

Abstract: In the framework of the Pollution of Alpine Valleys (POVA) programme, a numerical investigation aims to better understand how a reduction of traffic emissions can affect air quality in the Chamonix Valley (France). The MM5 model coupled with the Chemistry Transport Model (CTM) TAPOM using a 1-km cell grid for the period 5–12 July 2003 showed that the ozone formation in the Chamonix Valley was strongly NOx-saturated. A comparison with physical and chemical measurements (tethered balloon, UHF radar, monitoring data) prove the temperature profile and the up- and downhill thermally driven winds to be reasonably well described by MM5. Moreover spatial and temporal variation of O3 concentration is well described by TAPOM. Ozone production within the valley is estimated to 20 to 30 µg/m³ and 10 µg/m³ are locally produced from precursors emitted by international traffic through the tunnel.

Keywords: air pollution; mesoscale modelling; complex terrain; Alpine Valleys; photochemistry; ozone production; atmospheric dispersion modelling; France; air quality; pollutant concentration.

DOI: 10.1504/IJEP.2005.007394

International Journal of Environment and Pollution, 2005 Vol.24 No.1/2/3/4, pp.201 - 217

Published online: 15 Jul 2005 *

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