This article presents the results obtained during the expedition on board the research vessel throughout the water area of Lake Baikal from 1 to 9 September 2021. We determined the spatiotemporal heterogeneity of the distribution of polycyclic aromatic hydrocarbons (PAHs) and sub-10μm particulate matter (PM10) in the atmosphere above the water area of the lake. Local sources of air pollution along the lake coast and synoptic conditions affected the changes in the concentrations of pollutants. Elevated concentrations of PAHs and РМ10 were recorded near the Nizhneangarsk settlement in the northern basin, at the estuary of the Selenga River in the central basin as well as along the east coast and at the estuary of the Angara River in the southern basin of Lake Baikal. During the observations, the proportion of submicron particles at different sites of the lake water area decreased to 35-29 % of the total number concentration. Among the priority PAHs, fluoranthene > pyrene > benzo(b)fluoranthene predominated in the aerosol. Cyclones operating above the region, which were accompanied by precipitation and intense winds, led to the purification of the atmosphere and a decrease in the concentrations of the studied elements.
This article presents the results obtained during the ship borne expedition throughout the water area of Lake Baikal from 29 July to 11 August 2020. We determined the spatiotemporal heterogeneity in the distribution of PAHs and PM10 in the atmosphere above the water area of Lake Baikal. Aerosol above Lake Baikal consisted of submicron particles with the proportion of more than 90% of the total number concentration. The atmosphere above the water area of the northern basin Baikal showed background values of PAHs and high PM10 concentrations. When the wind direction changed from southwestern to northwestern, the PAH concentrations in smoke plumes from wildfires increased in the central and southern basins of Lake Baikal. Among the 21 priority PAHs, phenanthrene, fluoranthene and benzo(b)fluoranthene prevailed in the aerosol. We estimated the degree of atmospheric pollution with benzo(a)pyrene and PM10 standardized in Russia; they did not exceed the average daily MPCs.
We present the temporal and spatial variability of hazardous pollutants, such as polycyclic aromatic hydrocarbons (PAHs) and solid particle РМ10 above the surface of Lake Baikal during wildfires in the north of the Irkutsk Region, Krasnoyarsk Krai, and Yakutia in July 2019. Background values were determined along the west and northeast coast of the lake. We detected elevated concentrations in areas subjected to anthropogenic impact in the water area of Southern Baikal near the Listvyanka settlement and the towns of Baikalsk and Slyudyanka. The maximum amounts were recorded in smoke plumes from wildfires along the west coast, from Central to Southern Baikal.
We present the results of the content of 18 PAHs in the atmosphere over Lake Baikal obtained in the course of the shipboard expedition during wildfires in the Krasnoyarsk Territory and Yakutia in July 2018. We have obtained the data on the spatial distribution of the PAHs content and the mass concentration of aerosol particles in the near-water air layer throughout the entire lake area. We have also calculated PAH inflows to the water surface of the lake. Using backward trajectory modelling and satellite photographs, we have traced the movements of plumes from the seats of wildfires towards Lake Baikal.
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