Extreme Events of Aerosol Pollution of the Atmosphere in Winter in Tomsk Akademgorodok

Monitoring measurements of aerosol characteristics and meteorological parameters in the lower atmospheric layer in the winter periods of 2016–2022 in Akademgorodok located in the southeast of Tomsk were used to analyze the conditions for the occurrence of extreme concentrations of submicron particles and black carbon in their composition in the surface layer. It is shown that when surface air temperature inversion and weak (down to 1.5 m/s) wind (air stagnation) occur in combination, the average aerosol characteristics under study increase by as much as a factor of three, and by as much as a factor of 7–8 relative to the seasonal averages in the case of a weak northwesterly wind. It is found that in situations with multiday air stagnation, the typical daily behavior, characterized by the afternoon minimum, changes. The concentrations increase until 15:00 LT up to the values 1.8 times larger than the nighttime minimum. On the other winter days, the maximum occurs at 10:00 LT, with the concentrations of submicron (black carbon) particles being a factor of 1.2 (a factor of 1.5) larger than the nighttime minimum.