Increase in the aerosol backscattering ratio at lower mesosphere in 2019-2021 and its influence on the temperature measurements by the Rayleigh method
V.A. Korshunov, D.S. Zubachev
Russian Federal Service on Hydrometeorology and Environmental Monitoring Research and Production Association В«Typhoon», Obninsk, Russia
Keywords: aerosol, mesosphere, backscattering, lidar, solar activity, Rayleigh method for temperature measurements
Abstract
The measurements of aerosol backscattering ration in the lower mesosphere by means of sounding at two wavelengths of 355 and 532 nm at lidar stations of Roshydromet from 2012 to 2021 are presented. Appreciable increase in the backscattering ratio R has been observed in the altitude range 50-70 km since 2018. In 2019-2020, the average R attained 1.25 at an altitude of 70 km. The temperature measurements by the Rayleigh method at 532 nm in this period show a positive bias of the temperature of up to +20 K. The two-wavelength temperature measurement method allows one to eliminate this error.
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