Correlation between the mass concentrations of suspended particles PM10 and PM2.5 and aerosol optical depth in the coastal zone of Lake Baikal

Abstract

The paper presents the results of measurements of aerosol optical depth (AOD) and mass concentration of fine aerosols PM_2.5 and PM₁₀ in the coastal zone of Lake Baikal during summer of 2020. During period of high aerosol turbidity of the atmosphere, a relationship was revealed between variations in the spectral characteristics of the aerosol optical depth and the mass concentration of PM_2.5 and PM₁₀. With dense filling of the atmosphere with smoke aerosol from 10 to 14 August, a sharp increase in AOD (τ_0.5< 0.47) at st. Boyarsk to the absolute maximum on August 11 (τ_0.5< 0.57) was noted. At the same time, an increase in the mass concentrations of PM_2.5 (19-24 μg/m³) and PM₁₀ (42-59 μg/m₃) was recorded. The correlation coefficient between the mass concentration of PM₁₀ (PM_2.5) and AOD was 0.87 (0.86).