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CORSICA 2007: a project of field campaign on ozone photochemistry and aerosols in western Mediterranean


Gheusi François

Regarding tropospheric ozone and aerosols, the Mediterranean is a crossroad of influences at different scales (local, regional, intercontinental) and of various natures (photochemical pollution, biomass burning in the Mediterranean area or from high latitudes, mineral dust) with a probable radiative impact on the regional climate, especially in summer. Little is however known on this impact because this maritime area is poorly covered by in situ measurements. Satellite observation is a promising strategy but still needs validation work. There is thus a multiple need to build regional databases that enable to characterize the composition of air masses, their aging and mixing, and to close the radiative budget for the atmospheric column at the local scale.

Corsica is well located for collecting such data, and thus the altitude site Serra di Pigno (960 m) above Bastia has been chosen as a possible extension of the PAES network (monitoring of ozone and precursors in altitude sites in France). CORSICA 2007 is an international project of intensive observation campaign in summer 2007 around that site, ambitioning to answer the following questions:
- How to discriminate the influences at the different scales (local, regional, intercontinental) in the chemical signal measured at Serra di Pigno?
- What are the origin and characteristics of the air masses sampled there?
- How to use at best the satellite products on aerosol, and how to combine them to local observation to study long-range transport of pollution?
- What is the radiative impact in the Mediterranean area of turbid and/or polluted layers transported over long ranges, in particular those carrying summer biomass burning products and mineral dust?
The campaign will involve in situ ground measurements, profilers (ozone and aerosol lidars), and airborne observation at the local (ultra-light aircraft) and regional scales (Cessna aircraft). The database will also include permanent observations existing in the region