Atmospheric Pollutants Dynamics in Lake Baikal Region

The Lake Baikal region represents a unique taiga and high-altitude ecosystem whose atmospheric processes are shaped by both natural and anthropogenic influences. Key pollutant sources include transboundary transport of industrial emissions from nearby urban centres and thermal power stations, episodic influxes of smoke from Siberian wildfires, and local tourism and infrastructure growth along the shoreline. Once emitted, gases and particles undergo long-range advection within the regional atmospheric boundary layer, often forming distinct aerosol layers that persist over the lake surface owing to strong temperature inversions above the cold water. Chemical transformations—such as oxidation of sulphur and nitrogen compounds—lead to acidifying deposition and shifts in nutrient inputs that may alter the lake’s biogeochemistry. Seasonal cycling further modulates pollutant concentrations, with summer wildfire events driving elevated smoke aerosol and trace gas levels and wintertime stagnation enhancing local urban plumes. Understanding these dynamic processes is critical for assessing acid deposition, eutrophication risks and the broader climatic sensitivity of this globally significant freshwater reservoir.

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Atmospheric Pollutants Dynamics in Lake Baikal Region publication trend

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Technical terms

Aerosol optical depth: A dimensionless measure of the extinction of light by aerosols integrated over a vertical column of atmosphere.

Angstrom exponent: A parameter that describes the wavelength dependence of aerosol optical depth, indicative of particle size distribution.

Atmospheric boundary layer: The lowest part of the atmosphere directly influenced by the Earth’s surface, where pollutant dispersion and mixing occur.

Submicron aerosol fraction: Particulate matter with aerodynamic diameters smaller than one micrometre, often originating from combustion or secondary formation.

Gaseous trace pollutants: Minor atmospheric constituents such as sulphur dioxide and nitrogen oxides that can have significant environmental and health impacts.

Acid deposition: The transfer of acidic components, formed from oxidised sulphur and nitrogen gases, from the atmosphere to the surface via precipitation or dry settling.

References

1. Study of Atmospheric Aerosol in the Baikal Mountain Basin with Shipborne and Ground-Based Lidars. Remote Sensing (2023).
2. Variability of Chemical Properties of the Atmospheric Aerosol above Lake Baikal during Large Wildfires in Siberia. Atmosphere (2020).
3. Sulfur and Nitrogen Oxides in the Atmosphere of Lake Baikal: Sources, Automatic Monitoring, and Environmental Risks. Atmosphere (2021).