Combined Raman elastic-backscatter lidar for vertical profiling of stratospheric aerosol and climatology of background stratospheric aerosol over Siberia

摘要

At Siberian Lidar Station (SLS) in Institute of Atmospheric Optics, Siberian Branch of Russian Academy of Sciences, Tomsk (56.5°N; 85.1°E) we perform regular lidar measurements of the profiles of vertical distribution of optical characteristics of stratospheric aerosol at wavelength 532 nm with receiving telescope of a diameter 0.3 m. The temperature profile is measured in the altitude interval 10-70 km: from molecular backscattering signal at wavelength 532 nm in altitude range 30-70 km and from signal of Raman scattering by nitrogen at wavelength 607 nm in altitude range 10-30 km with receiving telescope of a diameter 2.2 m. In this paper we analyze the data of long-term (since 1986) lidar observations of stratospheric aerosol layer, performed at Siberian Lidar Station and data of expedition measurements in summer-fall periods of 2001-2003, obtained in Siberian region from middle to subpolar latitudes (from 52° to 69°N and from 73° to 106°E). Main attention is paid to analysis of data of last years of measurements obtained under conditions of "new" background period of long-term absence of explosive volcanic eruptions (last observed in June 1991).