Stratification of Aleurite and Sand Particle Size Distribution in Windsand Flux over Desertified Areas

An empirical model of the saltating aleurite and sand particle size distribution has been developed based on the measurements of the differential number concentrations in the size range from 30 to 330 μm using a size distribution approximation of the sum of two lognormal distributions. Approximations of the vertical profiles of distribution parameters have been derived for the layer from 0 to 15 cm. Vertical profiles of the modal size of the coarse particles in the saltation layer from 3 to 15 cm and in the surface air layer from 0.125 to 16 m are compared with measurements in the Aral region.