Contributions relatives
des aérosols minéraux et de feux sur la qualité de l'air en Euro-Méditerrannée.

Abstract : Anthropogenic (industrial, agricultural, combustion) and natural emissions (biogenic, biomass burning, dust) are sources that affect our atmosphere. With a rapid and measurable impact on the quality of air at a probable contribution to climate change, their role varies in terms of chemical species emitted and consequences on the environment and human health. In addition to a direct local impact, plumes of trace gases and particles can be transported far from their sources. This long-range transport induces changes in their characteristics and therefore their impact. As a result, local measurements are not sufficient to fully understand this problem. Satellite missions provide additional information as they allow a global observation for many species. This overview of the troposphere has particularly highlighted the importance of intercontinental transport and the large uncertainties in its representation by chemistry-transport models. This study has helped improve the characterization and quantification of the relative impact of local emissions and long-range transport on regional pollution based on the coupling between satellite observations and modeling species. The observations used are ground measurements of the AIRBASE and AERONET networks for concentration levels and aerosol optical thickness respectively, observations of MODIS and PARASOL satellites for the optical properties of aerosols as well as measurements of the CALIOP lidar for the vertical structure of aerosol plumes. The modeling was performed with the meteorological model WRF and chemistry-transport model CHIMERE. In order to directly compare the results of models simulations with measurements, a new tool has been developed. The added value of this tool compared to other similar tools for the computation of aerosol optical properties is the simulation of Level 1 lidar data. Thus, this work also illustrates the additional information that can be expected from the use of lidar observations for the analysis of aerosol related pollution episodes. Comparisons between model and observations were made for the Euro-Mediterranean region and the summer of 2007, during which nine intense episodes of mineral aerosols transported from Africa and forest fires throughout the region were added to anthropogenic and biogenic sources. The main results show a significant contribution of these sources to the exceedances of the pollution threshold both at local and regional level. Regarding forest fires, we show that this particular source of particles in the atmosphere was responsible for 40 to 55% of the total exceedances observed in Eastern Europe during the summer of 2007. The results of this study also helped highlight the critical points for the simulation of aerosols, which are associated with the considered parameterizations (aerosol size distribution, injection height, vertical diffusion), emissions and transport.
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https://pastel.archives-ouvertes.fr/pastel-00844872
Contributor : Stavros Stromatas <>
Submitted on : Tuesday, July 16, 2013 - 10:20:45 AM
Last modification on : Wednesday, May 15, 2019 - 3:37:31 AM
Long-term archiving on : Wednesday, April 5, 2017 - 12:37:07 PM

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  • HAL Id : pastel-00844872, version 1

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Stavros Stromatas. Contributions relatives
des aérosols minéraux et de feux sur la qualité de l'air en Euro-Méditerrannée.. Sciences de la Terre. Ecole Polytechnique X, 2013. Français. ⟨pastel-00844872⟩

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