DYNAMICS OF MESOSCALE BOUNDARY ATMOSPHERIC LAYER AND IMPURITY SPREADING WITH THE PHOTOCHEMICAL TRANSFORMATION ALLOWED FOR

The papers considers the joint computational model (i) of hydro- and thermodynamics for the boundary atmospheric layer, with thermal and orographic nonhomogeneities of the underlying surface taken into account, and (ii) of the spreading of multicomponent impurity, with the photochemical transformations taken into account. The coefficients of horizontal turbulent exchange are determined by means of the Reynolds stress tenser. The coefficient of vertical exchange is determined from equations for the kinetic turbulent energy and the rate of dissipation of energy into heat. The model takes into account the main sequences of photochemical reactions which are characteristic of the lower troposphere, large cities and industrial areas. The results of computational experiments on impurity spreading in the atmosphere and investigation of sensitivity of small gas constituents to variations in stable particles are presented.