Seasonal and daily variability of aerosol particle concentrations near St. Petersburg
K.A. Volkova, S.S. Anikin, E.F. Mihailov, D.V. Ionov, S.S. Vlasenko, T.I. Ryshkevich
Saint Petersburg State University, Petrodvorets, St. Petersburg, Russia
Keywords: массовая концентрация PM1, PM2.5, PM10, аэрозольная оптическая толща, аэрозольный спектрометр, GRIMM, AERONET, PM10 mass concentration, aerosol optical depth, aerosol spectrometer
Abstract
The measurements of mass concentrations of PM1, PM2.5, PM10 (2016-2018) using the aerosol spectrometer GRIMM carried out near Saint-Petersburg are analysed. The average concentrations of PM1, PM2.5, and PM10 for the entire measurement period are 4.5, 4.8, and 4.9 mg/m3, respectively. The hourly average PM10 concentrations were compared with the aerosol optical thickness (AOT) at a wavelength of 500 nm for different seasons. It was found that the best correlation between the concentration of PM10 and AOT is achieved in autumn. According to the distribution of wind directions, the maximal concentrations of PM10 correspond to the eastern direction (from St. Petersburg). The seasonal dependence of the daily variation in PM10 mass concentration on relative humidity and the height of the atmospheric boundary layer is analyzed. The highest concentrations of PM10 (about 8 mg/m3 on the average) and the maximal amplitude of the daily variation are observed in winter.
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