RÉSUMÉ

Experimental and theoretical investigations confirm the formation of Coherent Large Scale Eddy Structure (CS) in convective atmospheric boundary layer (ABL). They contain the main part of the turbulence energy and the turbulent transfer is achieved mainly by the action of CS. Such nonlocal turbulent transfer cannot be described within "standard" turbulent diffusion models of gradient type. The turbulent transport models of third- and second- order closure are presented in the paper (Ilyushin and Kurbatskii, 1997). These models describe the statistic structure of convective ABL adequately of the experimental data. In this paper the results of modeling of the pollutant turbulent transfer in ABL are presented. The approach based on accounting the influence of the CS by accentuation of the periodic properties of motions, which is analogous to VLES is used. But in this paper the accentuation of periodic motions are obtained for the pdf of vertical velocity field.