Numerical modeling of mesoscale atmospheric impurity transport processes in the environs of the city of Kirov

Abstract

A new quasi-two-dimensional model of impurity propagation from a man-made source is devised on the basis of a three-dimensional model of hydrothermodynamics of mesoscale processes in the lower atmosphere with account for the thermal nonuniformity of the underlying surface in the environs of a large industrial city. The boundary conditions and the model coefficients are determined using the parametrization method. The results of numerical calculations are presented. The calculations are performed using parallelized algorithms on a cluster supercomputer of the Vyatka State University. They show that, due to the action of an inhomogeneous horizontal temperature gradient in the lower atmosphere, vortex flows can be formed above populated areas. The disturbed wind flow has a considerable effect on the impurity propagation pattern in the neighborhood of the sources.