Yearly chemical profiles of aerosol in 2 alpine valleys

摘要

Following the accident under the Mont Blanc Tunnel on March 19th,1999,all international traffic between France and Italy (that was including about 2 130 heavy duty trucks per day on average)was stopped through the Chamonix Valley,most of that traffic being diverted to the Maurienne valley The program POVA (Pollution des Vallees Alpines)started in May 2000,with the objective to develop atmospheric modeling at the sub meso scale in each valley,in order to perform scenarios studies of the impact on air quality of changes of traffic and of local developments,taking into account gas and particles emissions.A part of the field experiments in the program consisted in longer-term daily sampling at one site in each valley,for COV concentrations and aerosol composition.The goals of this part of the program were to better constrain large-scale processes influencing atmospheric concentrations,including regional transport,meteorological factors,and seasonal variations in the sources types and sources strength.This presentation is focusing on aerosol composition during the first year of the program.