CONTINUOUS LIDAR MEASUREMENTS OF STRATOSPHERIC AEROSOLS AND OZONE AFTER THE PINATUBO ERUPTION .2. TIME EVOLUTION OF OZONE PROFILES AND OF AEROSOL PROPERTIES

Two lidar systems, an aerosol lidar and an O3 DIfferential Absorption Lidar (DIAL), have been routinely operated at the same site (L'Aquila, Italy; 42-degrees-N, 13-degrees-E) since August 1991. The multiwavele ngth analysis of the lidar signals allows to retrieve parameters relat ed to equivalent aerosol size distributions and their optical properti es. These are needed to correct the ozone DIAL profiles from the distu rbance introduced by the stratospheric volcanic aerosols. The method a nd the confidence of the retrieved ozone profiles are discussed in a c ompanion paper. Here we present the whole measurement series of ozone and backscattering ratio profiles during the period from August 1991 t o December 1992. In addition, for some observations, the mode radius a nd the dispersion of the representative aerosol size distribution are reported. The time evolutions of aerosol surface area density and mass mixing ratio are also discussed within the uncertainties of the retri eval algorithm.