INFLUENCE OF SMALL-SCALE CONVECTIVE PROCESSES ON A FINE-DISPERSE AEROSOL COMPONENT OF ATMOSPHERIC POLLUTION

E. M. Dobryshman

The size of suspended particles of the density ρ1 is estimated relative to the pressure the particles undergo from the ascending convective flow of the velocity w. The effort required to lift the unfixed microparticle from the underlying surface is roughly estimated. The estimates demonstrate that micron and submicron (linear) particles can rise and remain as suspensions by small-size convective circulation cells. Two different mechanisms of a convective nature are considered over the underlying surface with inhomogeneous temperature: 1) irregularly heated flat barchane; 2) flux disturbance of a specified velocity profile because of the flow transition to a surface with a different temperature. The values of vertical velocity and friction tension in these models happened to be in the range that corresponds to the shear and sustention of submicron and micron particles.