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Vertical Turbulent Dust-Aerosol Fluxes

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Abstract

Vertical turbulent dust-aerosol fluxes over a desertificated area in Astrakhan oblast under almost quasicontinuous saltation conditions have been calculated based on measurements (with a resolution of 1 s) of fluctuations in aerosol-particle concentrations and the vertical wind velocity component. It is shown that the time variability of the density of vertical turbulent dust-aerosol fluxes within a scale range of 30 s to 1 h is determined by convectively caused variations in both horizontal and vertical wind velocity components in the atmospheric surface layer. The normalized turbulent flux or the rate of dust-aerosol removal reaches 4–5 cm/s. The daily variations in vertical turbulent aerosol fluxes are in agreement with those in turbulent heat fluxes. Particle-size dependences of the mass turbulent dust-aerosol flux have been obtained. The method of estimating low-frequency variations in the density of turbulent dust-aerosol fluxes over a desertificated area has been proposed based on measurement data on the wind velocity components and the saltation threshold velocity.

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Funding

This work was supported by the Russian Scientific Fund, project no. 20-17-00214.

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Authors and Affiliations

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

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

  2. MIREA—Russian Technological University, 119454, Moscow, Russia

    R. A. Gushchin & O. I. Datsenko

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

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

Additional information

Translated by B. Dribinskaya

The 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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Karpov, A.V., Gorchakov, G.I., Gushchin, R.A. et al. Vertical Turbulent Dust-Aerosol Fluxes. Izv. Atmos. Ocean. Phys. 57, 495–503 (2021). https://doi.org/10.1134/S000143382105008X

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