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 results of experimental studies of small gas impurities in the atmosphere above Lake Baikal in July-August 2019 from the board of the science research vessel “Academic V.A. Koptyug". The features of ozone distribution, nitrogen oxides, and sulfur dioxide over the lake water area are analyzed depending on the circulation of air masses, synoptic conditions, the pyrogenic situation, and anthropogenic drifts during the observation period.
The results of experimental studies of the daily variability of surface ozone concentration (O3) in the atmosphere of the arid territory of Mongolia, obtained during scientific expeditions for the period 2005-2014 at the Sainshand station, are presented. Variations of hourly average concentrations of the O3 changed from 70 to 126 μg m-3.The daily variation of surface ozone concentration has minimal values in the morning during sunrise, and then there is an increase in ozone concentration in the daytime. The average amplitude of diurnal variations of O3 was 56 μg m-3.The maximum values of O3 in the daily dynamic were observed in 2014, and the minimum values in 2007.The factors leading to increased surface ozone content and their relationship to meteorological and turbulent characteristics of the atmosphere are analyzed. A special mode of behavior of surface ozone, characterized by its day and night increase in daily changes, was revealed.
The paper presents the results of studies of air mass and smoke aerosol transport using the HYSPLIT, NAAPS models and data of remote sensing CALIPSO during the forest fires in 2016 in Baikal region. In June 2016 the homogeneous filling of the atmosphere by smoke aerosol over the Baikal region up to 2 km was observed. It is revealed that in the spectra of particle size distribution the large particles of the submicron aerosol fraction with a diameter exceeding 200 nm are observed, typical for smoke particles. The results of trajectories calculation have shown that in June influence of local fire on air quality in Ulan-Ude was observed under the general northwest transport of a smoke aerosol, in July downwind was mainly from the Irkutsk, Krasnoyarsk and the Yamalo-Nenets regions.
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).
In given article results of experimental researches of meteorological parameters in atmosphere of arid and semiarid
territories of Mongolia received during scientific expedition 2006 are resulted. Meteorological fond data 2003-2005 of st.
Sainshand and st. Baruun-Urt for the analysis of dust storms conditions and ways of distant transport small gaseous
impurities in atmosphere of desert Gobi are analyzed.
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