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Stability of the Vertical Distribution of Dust Aerosol under Weak and Moderate Winds

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Abstract

The profiles of dust aerosol mass concentration obtained with multilevel (0.2, 0.4, 0.8, 1.6, and 3.2 m) daytime measurements in arid conditions in 2020–2022 show a power dependence on height. We distinguish three main types of changes in concentration with height: (a) in low wind (degrees are close to –0.5), (b) burst changes in concentration when wind increases (degrees reach and exceed –1), and (c) inversions (concentration increases with height at two or three lower levels of measurements): weak (about –20 mkg/cm3) and significant (more than 50 mkg/cm3). The power dependence of –0.5 is explained by the collective effect of the rise of the ensemble of closely located bubbles of air warmed around the dust particles. In weak and moderate winds, this mode is more common. Burst changes in concentration are associated with the emergence of turbulent structures.

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Funding

This research was carried out with the support from the Russian Science Foundation, project no. 23-27-00480 “Investigation into the Generation and Removal of Dust Aerosol over Arid Territories under Conditions of Relief and Temperature Inhomogeneities.”

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Authors and Affiliations

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

    E. A. Malinovskaya, O. G. Chkhetiani, G. S. Golitsyn & V. A. Lebedev

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  1. E. A. Malinovskaya
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  2. O. G. Chkhetiani
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  3. G. S. Golitsyn
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  4. V. A. Lebedev
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Correspondence to E. A. Malinovskaya.

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ADDITIONAL INFORMATION

This article was prepared on the basis of an oral report presented at the IV All-Russian Conference Turbulence, Atmospheric and Climate Dynamics with international participation, dedicated to the memory of Academician A.M. Obukhov (Moscow, November 22–24, 2022).

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Malinovskaya, E.A., Chkhetiani, O.G., Golitsyn, G.S. et al. Stability of the Vertical Distribution of Dust Aerosol under Weak and Moderate Winds. Izv. Atmos. Ocean. Phys. 59, 548–558 (2023). https://doi.org/10.1134/S0001433823050080

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  • DOI: https://doi.org/10.1134/S0001433823050080

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