Diurnal behavior of scattering phase function at 1.2 and 20 degrees in different type of aerosol weather

Using a closed-type small-angle photometer, experimental data were obtained and a comparative analysis of the diurnal variations of the values normalized to the daily average value of the angular scattering coefficient I(φ) was carried out. The data were obtained in 2010-2020 at the Aerosol Station of the LOA IAO SB RAS located in the suburbs of Tomsk. The complex makes it possible to measure round the clock the angular scattering coefficient I(φ) in absolute units (Mm^-1·sr^-1), in the angular φ=1.2÷20 degrees at a wavelength of 650 nm. The data arrays were formed on the basis of hourly values. The data were divided into subarrays within the framework of the empirical classification of the types of "aerosol weather" and by season. To analyze the seasonal and diurnal variability of the in the coarse (r> 1 μm) and submicron (r <1 μm) particle properties, the angular scattering coefficients at the angles of φ = 1.2‡ and φ = 20° were considered. The diurnal variation of the parameters in four situations: "background", "haze", "smog", and "smoke haze" is analyzed.