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Qualité de l‘air et climat : la modélisation des aérosols atmosphériques

Abstract : Since 2004, the French national air quality forecasting system, PREV’AIR, has been providing maps of forecasted ozone and particulate matter (PM) concentrations throughout Europe. At the national level,“analysed maps” based on simulations corrected with observations are also available daily. These products have been elaborated using modelling capacities developed within INERIS. Significant efforts have been placed on particulate matter modelling, considering the growing interest of the people in charge of air quality management and monitoring for these tools. Thus, beyond the PREV’AIR applications, research studies are being conducted within INERIS for improving knowledge in the fields of aerosol phenomenology, modelling and monitoring. The evaluation and the improvement of the CHIMERE-aerosol model is a priority. Comparison with available measurements generally shows that models underestimate the measured concentrations. This is a well-known limit of the current modelling systems, highlighted by several European model inter-comparison exercises: City-Delta and Eurodelta. INERIS participated in these projects, which enabled several phenomena to be clarified: uncertainties in emissions (wood burning, traffic), secondary aerosol formation processes, natural sources, cloud chemistry, etc. These topics are likely to be considered as future priorities for model development. Nevertheless the current performance of the CHIMERE model is satisfactory enough to use its results for analysing large scale pollution events involving PM, and especially secondary compounds such as ammonium nitrate. INERIS is also involved in research activities related to the links between air pollution and climate change. Aerosols, depending on their nature, play a special role through three main pathways: 1) Affecting the impact of solar radiation and having a cooling (sulphate, organic carbon) or warming (black carbon) effect on the atmosphere. 2) Impacting the vertical distribution of temperature and cloud formation 3) Changing the reflecting properties and lifetime of clouds, inducing a positive or negative effect on climate warming. INERIS has elaborated with the Laboratoire d’Aérologie (CNRS/LA) and with the support of ADEME a new aerosol model that can take the carbonaceous fraction accurately into account. A first step to reach a more accurate representation of links between future climate and air pollution.
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  • HAL Id : ineris-01869085, version 1



Bertrand Bessagnet, Laurence Rouil. Qualité de l‘air et climat : la modélisation des aérosols atmosphériques. Rapport Scientifique INERIS, 2007, 2006-2007, pp.40-44. ⟨ineris-01869085⟩



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