Quasiperiodic Emission of Dust Aerosol in a Desertified Area

Vertical turbulent and convective fluxes and corresponding velocities of the dust aerosol particle uplift under conditions of quasiperiodic emission have been determined by the measurements of the dust aerosol particle concentrations and the turbulent fluctuations of the wind speed components in a desertified area in the Astrakhan region. It is shown that convective fluxes are caused by the combined action of both regular upward motions (updrafts) in the convective coherent structure of the atmospheric boundary layer and turbulent diffusion. In the surface layer of the atmosphere at heights from 0.3 to 6.0 m, the vertical profiles of the dust aerosol concentration are approximated by power functions. It is demonstrated that the vertical turbulent and convective fluxes of dust aerosol can be estimated by the gradient method using the scales of turbulent and convective vertical motions in the atmospheric boundary layer.