Monitoring the Variability of the Stratospheric Aerosol Layer over Tomsk in 2016–2018 Based on Lidar Data
2021
The results of observations of the features of
intraannual variability for the vertical structure of background aerosol
in the stratosphere over Western Siberia in 2016–2018 are presented and
analyzed. Experimental data were obtained at the lidar complex of Zuev
Institute of Atmospheric Optics (Siberian Branch, Russian Academy of
Sciences) with a receiving mirror diameter of 1 m. The objective of the
study is to investigate the dynamics of background stratospheric
aerosol, since during this period there were no volcanic eruptions
leading to the transport of eruptive aerosol into the stratosphere. The
results of the study confirm a stable intraannual cycle of maximum
aerosol filling of the stratosphere in winter, a decrease in spring to
the minimum, practical absence in summer, and an increase in autumn. At
the same time, the variability of stratification and aerosol filling is
observed for different years. It was found that aerosol is concentrated
in the layer up to 30 km all year round, except for the winter period.
It is shown that the vertical aerosol stratification is largely
determined by the thermal regime of the troposphere–stratosphere
boundary layer. The absence of a pronounced temperature inversion at the
tropopause contributes to an increase in the stratosphere–troposphere
exchange and, as a result, to the aerosol transport to the stratosphere.
This situation is typical of the cold season. For the first time, data
on the quantitative content of stratospheric aerosol (its mass
concentration) were obtained from single-frequency lidar data.
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