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Vertical Distribution of Aleurite and Sand Particles in Windsand Flux over a Desertified Area

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Abstract

Measurements in a desertified area in Astrakhan oblast at heights from 3 to 15 cm under almost nonintermittent saltation on August 23 and September 9, 2011, have been used to determine the size distribution functions of saltating particles in the range from 30 to 330 μm and the vertical profiles of differential number concentrations of particles with sizes of 47.0, 85.6, 104.6, 127.7, and 156.0 μm, which are approximated by exponents. In the lower saltation layer of around 9 cm in thickness, the height scale and the logarithmic concentration gradient have been found to be independent of wind speed. At heights of 11 and 15 cm, the total concentration of saltating particles is nonlinearly related to wind speed in the atmospheric surface layer. For the variation range of wind speeds from 6 to 11.0 m/s, vertical distributions of the concentration of saltating particles have been constructed using approximations by piecewise exponential profiles of the total concentration of particles. An analytical dependence of the logarithmic concentration gradient in the upper saltation layer on the wind speed has been obtained. A small-parameter model of the vertical distribution of saltating particles in the range of heights from 0 to 15 cm has been developed. Approximations of dependences of the height scale on the particle size have been proposed for the vertical profiles of concentration and mass fluxes of saltating particles.

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Funding

This work was supported by the Russian Foundation for Basic Research, project no. 19-05-00758.

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Authors and Affiliations

  1. Obukhov Institute of Atmospheric Physics, Russian Academy of Sciences, 119017, Moscow, Russia

    G. I. Gorchakov, A. V. Karpov, R. A. Gushchin, O. I. Datsenko & D. V. Buntov

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  1. G. I. Gorchakov
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  2. A. V. Karpov
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  3. R. A. Gushchin
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  4. O. I. Datsenko
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  5. D. V. Buntov
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Corresponding authors

Correspondence to G. I. Gorchakov, A. V. Karpov, R. A. Gushchin, O. I. Datsenko or D. V. Buntov.

Additional information

Translated by V. Arutyunyan

This paper was prepared based on an oral report presented at the All-Russia Conference on Turbulence, Dynamics of Atmosphere and Climate dedicated to the memory of Academician A.M. Obukhov (Moscow, November 10–12, 2020).

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Gorchakov, G.I., Karpov, A.V., Gushchin, R.A. et al. Vertical Distribution of Aleurite and Sand Particles in Windsand Flux over a Desertified Area. Izv. Atmos. Ocean. Phys. 57, 486–494 (2021). https://doi.org/10.1134/S0001433821050078

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  • DOI: https://doi.org/10.1134/S0001433821050078

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