Tomsk, Tomsk, Russian Federation
The results of an experimental study of the dynamics of stratospheric filling with background aerosol over Western Siberia for the period 2017-2025, characterized by the absence of large volcanic eruptions, are presented. The observations were performed at the lidar complex of the IOA SB RAS (Tomsk) at a wavelength of 532 nm. A comprehensive statistical analysis technique with iterative removal of anomalies by the Z-score criterion is applied. It is shown that in the long term, the overall level of background stratospheric aerosol is statistically stable, but a clear seasonal asymmetry has been revealed: in summer there is a significant upward trend in aerosol load, and in spring there is a steady downward trend.
stratosphere, background aerosol, lidar monitoring, statistical analysis, seasonal trends, Western Siberia
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