Variations in the ozone concentration during the boundary layer development over urban area

Some results obtained during two campaigns (summer 2004 and autumn 2005) of observation of the planetary boundary layer dynamics over the urban area of the Sofia city are presented. An EARLINET scanning aerosol lidar, an ozone analyzer and a ground meteorological station were used during the observations. Particularly, the mixing layer development and the residual layer destruction along with the relevant ground level ozone concentration variation followed during the convective boundary layer formation in two situations (in the case of a partial solar eclipse, and in the case of atmospheric internal gravity waves presence) are presented and considered.