Temporal variability of submicron and coarse aerosol concentrations in the surface air layer at the Aerosol Station of Institute of Atmospheric Optics, Siberian Branch, Russian Academy of Sciences, Tomsk (2000-2020)
V.V. Pol'kin, M.V. Panchenko
V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, Tomsk, Russia
Keywords: submicron and coarse atmospheric aerosol, temporal variability, background aerosol, Western Siberia
Abstract
The long-term temporal variability of the microstructural characteristics of aerosol in the surface air layer, measured in the monitoring mode at the aerosol station of IAO SB RAS in 2000-2020, is analyzed. Estimates are made on the basis of the concentrations of submicron ( Nf ) and coarse ( Nc ) particles and their ratio Nf / Nc . Two data arrays are considered: “full” and for the “background” aerosol weather type. The range of variations in the annual average values of the total concentration of particles N ( r > 0.2 mm) is found to be 8-50 cm-3, and for background situations, 5-30 cm-3. No reliable long-term trends in the characteristics under study are revealed. Spectral analysis of the monthly average concentrations for the “background” array shows the presence of a significant (with a probability of 0,95) time period of about a year for Nf / Nc and Nf and its absence for Nc .
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