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

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...

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Bibliographic Details
Published in:Izvestiya. Atmospheric and oceanic physics 2023-10, Vol.59 (5), p.548-558
Main Authors: Malinovskaya, E. A., Chkhetiani, O. G., Golitsyn, G. S., Lebedev, V. A.
Format: Article
Language:English
Subjects:
Aerosol concentrations
Aerosols
Atmospheric particulates
Climatology
Dust
Dust particles
Earth and Environmental Science
Earth Sciences
Geophysics/Geodesy
Height
Inversions
Vertical distribution
Wind
Winds
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Summary: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/cm 3 ) and significant (more than 50 mkg/cm 3 ). 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.
ISSN:0001-4338
1555-628X
DOI:10.1134/S0001433823050080