Abstract
A combined mathematical model was developed for the regional-scale dynamics of gaseous admixtures and aerosols in the atmosphere. The model incorporates the following modules: thermo-hydrodynamic equations for meso-scale atmospheric processes in the non-hydrostatic approximation; transport of gaseous admixtures and aerosols, with allowance for photochemical transformation and binary homogeneous nucleation; and kinetic processes of condensation/evaporation and coagulation. Particular emphasis is given to the mechanisms of new-particle formation through binary homogeneous nucleation of drops of sulfuric acid and water vapor. By using this model, numerical experiments were performed to investigate spatio-temporal variations in the concentrations of gaseous admixtures and aerosols, as well as the formation of fine aerosol clusters in the Lake Baikal (Russia) and Antwerp (Belgium) areas due to strong industrial emission sources. The results of the numerical experiments are analyzed.
Highlights
The atmosphere is known to contain emissions of many gas- and aerosol-phase chemical substances emitted from the Earth's surface
Results for the Lake Baikal Area Using the models described above, numerical experiments were performed to investigate the spatio-temporal variations of gaseous admixtures and aerosols in the Lake Baikal region
Results for the Antwerp Area The second class of numerical experiments is related to the modeling of gas and aerosol variability in the Antwerp area in Belgium
Summary
The atmosphere is known to contain emissions of many gas- and aerosol-phase chemical substances emitted from the Earth's surface In the atmosphere, these substances undergo a series of chemical and physical transformations through atmospheric circulation, photochemistry, homogeneous nucleation, condensation/evaporation, and coagulation. These substances undergo a series of chemical and physical transformations through atmospheric circulation, photochemistry, homogeneous nucleation, condensation/evaporation, and coagulation Since all these processes are interconnected, there is good reason to consider them within the framework of a single model. A further objective is to make the model generic and show that it can be used and applied for regional scale assessments in geographically different regions. With these objectives in mind the model was applied in two different study areas: Lake Baikal in Russia on one hand and the densely populated industrialized area of Antwerp
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