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

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Abstract

Based on fluctuations measurement results in the components of wind speed, air temperature and concentration of aerosol particles on a desertified area in the Astrakhan region under conditions of intermittent emission of dust aerosol, vertical turbulent fluxes of dust aerosol and heat were determined. Using spectral analysis, the temporal variability of the horizontal and vertical components of wind speed, air temperature and concentration of dust aerosol particles was characterized. It is shown that the intermittent emission of the dust aerosol is determined by low-frequency convective-induced variations in the horizontal component of wind speed when the threshold saltation speed is exceeded. Significant differences in the spatiotemporal variability of vertical heat transfer and dust aerosol were revealed. The 30-minute average values of heat fluxes (90–158 W/m2) and dust aerosol (7.2–27.5 cm–2cm–1), as well as the rate of heat removal (14–21 cm/s) and dust aerosol (10–16 cm/s).

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About the authors

G. I. Gorchakov

A.M. Obukhov Institute of Atmospheric Physics, Russian Academy of Sciences

Author for correspondence.
Email: gengor@ifaran.ru
Russian Federation, Moscow

O. G. Chkhetiani

A.M. Obukhov Institute of Atmospheric Physics, Russian Academy of Sciences

Email: gengor@ifaran.ru
Russian Federation, Moscow

A. V. Karpov

A.M. Obukhov Institute of Atmospheric Physics, Russian Academy of Sciences

Email: gengor@ifaran.ru
Russian Federation, Moscow

R. A. Gushchin

A.M. Obukhov Institute of Atmospheric Physics, Russian Academy of Sciences

Email: gengor@ifaran.ru
Russian Federation, Moscow

O. I. Datsenko

A.M. Obukhov Institute of Atmospheric Physics, Russian Academy of Sciences

Email: gengor@ifaran.ru
Russian Federation, Moscow

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Supplementary files

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2. Fig. 1. Time variability 09.09.2021 in the period from 10:00 to 15:00 according to measurements at a height of 3 m of the horizontal component of wind speed (1), turbulent pulsations (2) of the vertical component of wind speed (smoothed at an interval of 50 seconds), air temperature pulsations (5) – smoothed at an interval of 50 c and the total concentration of dust aerosol particles (6). Designations: 3 – threshold saltation rate, 4 – the starting point for the vertical component of wind speed, 7 and 8 – intervals of piecewise linear approximation of the air temperature trend, 9 - concentration of background aerosol, 10 – the moment of fracture of piecewise linear temperature interpolation, I –X – 30-minute intervals.

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3. Figure 2. Spectral power density of turbulent pulsations of the horizontal component of wind speed (a), the vertical component of wind speed (b) fluctuations in air temperature (c) and fluctuations in the total concentration of dust aerosol particles (d). Designation: 1 – calculated spectra, piecewise linear approximations in the region of “high” frequencies (2), “low” frequencies (3) and in the “intermediate frequencies” range 1-5 MHz (5), near 100 MHz (6) and in the range from 100 to 10 MHz (7, 8 and 9).

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4. Fig. 3. Temporal variability of the density of vertical turbulent fluxes of dust aerosol (1) and heat fluxes (2).

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5. Fig. 4. Spectra of turbulent fluxes of dust aerosol (a) and heat (b). See the designations in Fig. 2.

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