Biogenic emissions contribution on air quality at regional scale

Two episodes of ozone pollution, the august 8(th) and 9(th) 1998 and the july 16(th) 1999, in the Paris region (France), are studied by numerical modeling. These episodes (respectively IOP2 and IOP6) have been documented during ESQUIF, a French experimental campaign which took place between 1998 and 2000 in Paris region, In order to evaluate, the contribution of biogenic emissions of volatile organic compounds by vegetation, two simulations are performed: with and without these biogenic VOC, for each lop. The non-hydrostatic meso-scale model MESO-NH-C contains a parameterization of isoprene and monoterpenes emissions by forests canopies. These simulations pointed out that biogenic emissions contribution in ozone production can be important, either in the Paris plume, or in rural areas, in condition that the temperature is high enough to produce biogenic compounds and that NOx concentrations are high enough.