Abstract
An atmospheric dispersion model for gaseous pollutants in the convective boundary layer is presented. An implicit finite difference scheme is used for the numerical solution of the atmospheric diffusion equation. The coefficient of eddy diffusivity and wind velocity are taken as a function of vertical distance. The modelling incorporates the combined influences of chemical transformation, source emissions and surface removal of air contaminants. Ground deposition of the pollutants is accounted for by applying an absorptive boundary condition at the ground surface and including a gravitational settling term in the atmospheric diffusion equation. The concentration of air pollutant is studied for variable atmospheric stability, dry deposition and gravitational settling velocities and chemical reaction rates.
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