COMPARING SIMULTANEOUS STRATOSPHERIC AEROSOL AND OZONE LIDAR MEASUREMENTS WITH SAGE-II DATA AFTER THE MOUNT-PINATUBO ERUPTION

Stratospheric aerosol and ozone profiles obtained simultaneously from the lidar station at the University of L'Aquila (42.35 degrees, 13.33 degrees E, 683m above sea level) during the first months following the eruption of Mount Pinatubo are compared with corresponding nearby Str atospheric Aerosol and Gas Experiment (SAGE) II profiles. The agreemen t between the two data sets is found to be reasonably good. The tempor al change of aerosol profiles obtained by both techniques showed the i ntrusion and growth of Pinatubo aerosols. In addition, ozone concentra tion profiles derived from an empirical time-series model based on SAG E II ozone data obtained before the Pinatubo eruption are compared wit h measured profiles. Good agreement is shown in the 1991 profiles, but ozone concentrations measured in January 1992 were reduced relative t o time-series model estimates. Possible reasons for the differences be tween measured and model-based ozone profiles are discussed.