Influence of the interactions of local dynamical processes with large-scale flow on air quality in the grenoble area

Abstract

The vertical distribution of ozone over the Grenoble area is investigated for two summer smog episodesin 1999 and 2003. The effects of the interactions of local dynamical processes with large-scale circulations wereestimated using numerical modelling. The results suggest that a terrain-induced shear layer above the boundary layerconfines pollutants within the valley. Vertical exchanges through this shear layer have a considerable influence on thenear-surface ozone concentration from day to day