Abstract
The paper analyzes the interannual, seasonal variations of the optical and microphysical characteristics of aerosol in the Baikal region atmosphere according to measurements using the CIMEL sun photometer of the AERONET network at Tory station and according to the data of expedition measurements using the SP-9 sun photometer on the southeastern coast of Lake Baikal from 2010 to 2020. It is shown that in recent years, there has been an increase of the average monthly aerosol optical depth (AOD) values in the summer months, which is consistent with an increase in smoke emission due to annual large-scale wildfires in the boreal forests of Siberia and Yakutia in summer. Aerosol classification was carried out based on filtration and selection of the prevailing types of aerosols by analysis of aerosol optical depth and Angstrom exponent. It was revealed that in summer, the proportion of the smoke component of the aerosol optical depth increases to 30% compared to the spring. In the presence of smoke advection, the close relationship of AOD with the concentrations of the microdispersed aerosol fraction PM10 and PM2.5 was revealed. The correlation coefficients between the concentration of particulate matter (PM10 and PM2.5) and AOD were 0.87 and 0.86, respectively.
Highlights
Atmospheric aerosols are a complex chemical mixture of solid and liquid particles suspended in the air
This paper presents the main characteristics of optical and microphysical properties of aerosol using long-term observational data of AERONET, including the aerosol optical depth, Angstrom exponent, single scattering albedo, volume particle size distribution and classification of the type of aerosol at Tory station and at the “Boyarsky” scientific station of the Institute of physical materials science Siberian branch of Russian academy of sciences from 2010 to 2020
Experimental measurements of the aerosol optical depth in the Boyarsky station atmosphere were carried out using an SP-9 multiwave sun photometer in the wavelength
Summary
Atmospheric aerosols are a complex chemical mixture of solid and liquid particles suspended in the air. They vary in size from the smallest ultrafine shape with a diameter of several nanometers to large particles with a diameter of several micrometers or more [1,2]. The impact of atmospheric aerosols on the radiative balance is still highly uncertain due to their large spatial and temporal variability, variability in composition, size distribution, particle shape and vertical distribution [3]. AOD is a dimensionless parameter that indicates the extent to which radiation transmission is impeded by absorption or scattering of sunlight through aerosols in the atmosphere. AOD plays a key role in characterizing atmospheric turbidity and it is indicated by aerosol pollution [9,10,11,12]
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