Vertical Turbulent Fluxes of Aerosol and Heat in a Desertified Area during the Intermittent Emission of Dust Aerosol
摘要
According to measurements in September 2021 in a desertefied area in Astrakhan oblast, vertical turbulent heat and dust aerosol fluxes were determined as components of wind speed, air temperature, and concentration of aerosol particles in the surface layer of the atmosphere. A statistical analysis of variations in meteorological parameters and aerosol particle concentrations has been performed. The temporal variability of the horizontal and vertical components of wind speed, air temperature, and aerosol particle concentration is 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 uplift from the underlying surface according to synchronous measurements using Meteo-2 and Metek acoustic weather stations. Significant differences in the spatiotemporal variability of the vertical turbulent transfer of heat and dust aerosol in a desertified area have been revealed. The 30-min 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 uplift rate (14–21 cm/s) and dust aerosol (10–16 cm/s) from the underlying surface, have been determined. 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 min and “high-frequency variations with a duration of less than approximately 10 s.”