Vertical turbulent fluxes of aerosol and heat in a desertified area during intermittent emission of dust aerosol

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Resumo

According to measurements in September 2021 in a desertefied area in the Astrakhan region components of wind speed, air temperature and concentration of aerosol particles in the surface layer of the atmosphere, vertical heat turbulent fluxes and dust aerosol were determined. A statistical analysis of variations in meteorological parameters and aerosol particle concentrations was performed. The temporal variability of the horizontal and vertical components of wind speed, air temperature and aerosol particle concentration was analyzed using spectral analysis. A comparison has been made of the empirical distribution functions of heat flux density and the temporal variability of the rate of heat removal from the underlying surface according to synchronous measurements using acoustic weather stations Meteo-2 and Metek. Significant differences in the spatiotemporal variability of the vertical turbulent transfer of heat and dust aerosol in a desertified area were revealed. The 30-minute average values of the friction velocity, the Monin-Obukhov scale, turbulent heat fluxes (90–160 W/m2) and dust aerosol (7.2–27.5 cm–2 s–1), as well as the heat removal rate (14–21 cm/s) and dust aerosol (10–16 cm/s) from the underlying surface. It is shown that the temporal variability of the dust aerosol flux density is caused by a superposition of convective “low-frequency” movements with a scale of approximately 3–15 minutes and “high-frequency variations with a duration of less than approximately 10 s.”

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Sobre autores

G. Gorchakov

Obukhov Institute of Atmospheric Physics RAS

Autor responsável pela correspondência
Email: gengor@ifaran.ru
Rússia, Pyzhevsky per., 3, bld. 1, Moscow, 119017

A. Karpov

Obukhov Institute of Atmospheric Physics RAS

Email: gengor@ifaran.ru
Rússia, Pyzhevsky per., 3, bld. 1, Moscow, 119017

R. Gushchin

Obukhov Institute of Atmospheric Physics RAS

Email: gengor@ifaran.ru
Rússia, Pyzhevsky per., 3, bld. 1, Moscow, 119017

O. Datsenko

Obukhov Institute of Atmospheric Physics RAS

Email: gengor@ifaran.ru
Rússia, Pyzhevsky per., 3, bld. 1, Moscow, 119017

G. Kurbatov

Obukhov Institute of Atmospheric Physics RAS

Email: gengor@ifaran.ru
Rússia, Pyzhevsky per., 3, bld. 1, Moscow, 119017

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2. Fig. 1. Temporal variability on 09.09.2021 (a) of the horizontal (1) and vertical (2) components of wind speed, dispersion (3) of the vertical component of wind speed, dynamic speed (4), (b) air temperature (5), dust aerosol particle concentration (6), Monin-Obukhov scale (7) and air temperature dispersion (8). Designations: 9 – background aerosol particle concentration, 10 and 11 – piecewise linear approximation of the temperature trend, 12 – inflection point on the approximating curve

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3. Fig. 2. Empirical distribution functions of the horizontal (a) and vertical (b) components of wind speed, air temperature fluctuations (c) and concentration of dust aerosol particles (d)

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4. Fig. 3. Spectra of fluctuations of the vertical component of wind speed (1), air temperature (2) and horizontal component of wind speed (3). Designations: 4, 5, 6 – fragments of piecewise-power approximation of spectra

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5. Fig. 4. Temporal variability of (a) the flux density (1) and the removal rate (2) of aerosol and (b) the heat flux density (3) and the removal rate of heat (4) from the underlying surface

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6. Fig. 5. Aerosol flux density during burst emission in the period from 14:20 to 15:20

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7. Fig. 6. Empirical distribution functions of temperature flux density based on measurement data in 2021 with a time resolution of 0.09 s (a) and in 2010 with a time resolution of 0.02 s (b)

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8. Fig. 7. Temporal variability of turbulent temperature flux on 17.08.2010 based on synchronous measurements using acoustic weather stations Meteo-2 (1 and 2) and weather station Metek (3)

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