The results of monitoring of the concentrations of gas impurities (SO2, NO, NO2, O3), aerosol particles of different fractions (ultrafine and submicron aerosols) in the coastal zone of the Lake Baikal (Boyarsky station) in different seasons of the year (spring, summer, autumn) during the experiments of 2022 are presented. It was revealed that in the spring months, the highest average daily concentrations of ozone (O3), sulfur dioxide (SO2), nitrogen dioxide (NO2), and the number concentration of nanometer-sized particles are observed compared to other seasons. In the summer months, the proportion of particles of the submicron size range increases, due to an increase in the contribution of not only anthropogenic sources of emissions, but also natural sources (wildfires) during this period of the year.
The paper presents the results of experimental measurements of the aerosols mass concentration PM2.5 and PM10 at the Boyarsky station in May-September 2022. According to the results of measurements and model calculations by Copernicus (CAMS) and Ventusky (SILAM), the seasonal variability of PM2.5 and PM10 aerosol in the atmosphere of Lake Baikal is revealed. The highest concentrations of PM2.5 and PM10 were found in spring (40±18 and 81±34 μg/m3) and summer (20±16 and 26±20 μg/m3), the lowest in autumn (10±5 and 16±11 μg/m3). During the smoke drift, a significant increase in the concentrations of aerosol fractions PM10, PM2.5 and gas impurities NO2, SO2 was noted.
The experimental study of the flux and rate of the dry deposition of small gaseous impurities on different types of vegetation in the Baikal region are presented. Based on the eddy covariance method and the flux gradient methods (including the aerodynamic gradient method (AGM), the modified Bowen method (MBR) and modified gradient method (MGM)) and with experimental data, the quantitative estimates of the fluxes and dry deposition velocity of ozone on the underlying surface were obtained for different environments (grasslands, forest). The average values of the dry deposition velocity of ozone (Vd) were equal to 0.37 cm/s at night (0–3 h) and 0.91 cm/s during daytime hours (12–18 h). The ozone flux (F) was 0.24 μg m–2 s–1 at night and 0.72 μg m–2 s–1 in the afternoon. The quantitative estimates of Vd and F on vegetation and in the forest show a higher absorptive capacity of forests compared to soil vegetation.
The analysis of aerosol optical thickness variations of Tory atmosphere from 2012-2019 using the CE-318 sun photometer (AERONET) is carried out. It is revealed that station Tory is subject to strong smoke from forest fires in the spring-summer period, which largely determine the spectral course of aerosol optical depth. The distribution of aerosol particles in size showed that in the spring and summer months the proportion of subfraction aerosol is high. In addition, the paper presents the results of a comparative analysis of the ultrafine aerosol obtained using an aerosol diffusion spectrometer in the spring-summer period in Lake Baikal coastal zone.
The paper discusses the results of experimental studies of chemical, microphysical and optical properties of atmospheric aerosol in different natural and climatic conditions of Mongolia. The main factor in the formation of the component composition of aerosols are anthropogenic emissions, whose proportion in the urban atmosphere (Ulan-Bator, Sukhbaatar) is significantly higher than at stations in arid regions where regional sources of emissions are associated with mining enterprises, road transport and terrigenous dust. The data of long-term observations AERONET at the station Dalanzadgad were used for analyze of the seasonal, annual variations of AOD in the Gobi Desert. It is established that high transparency of the atmosphere is observed (τ0.5=0.09) with a maximum in spring and summer (τ0.5=0.15) and a minimum in winter (τ0.5=0.04).
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.