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1. Introduction

Lidar is valuable tool for stratospheric aerosols studies. The main focus have been on measurement of the aerosols produced by volcanic eruptions, as in the recent case of the last century bigest eruption, Mt. Pinatubo (Russell et al., 1993; Antuña , 1996a; Barnes et al., 1997). Less information have been obtained from stratospheric aerosols background conditions.

In this presentation we analyze the stratospheric aerosols background conditions before and after Mt. Pinatubo eruption, as it have been measured at Camagüey Lidar Station (CLS). We combine such lidar aerosols measurements with the observations from the Stratospheric Aerosols and Gas Experiment (SAGE II) satellite.

Because of several different reasons the set of measurements at CLS from 1988 to the present show discontinuities. However the lidar record provide enough measurements to cover both volcanic and non-volcanic conditions. CLS lidar aerosol backscattering mesurements of Mount Pinatubo eruption have been reported before (Antuña et al., 1995; Antuña, 1996b; Estevan et al., 1998). Up to now the measurements during stratospheric background conditions have not. Here we make such report by first time.