The Radon Transport and the Atmospheric Boundary Layer Electric State Formation

S. V. Anisimov, S. V. Galichenko, K. V. Aphinogenov

The mechanisms of influence of stratified turbulence to the formation of the atmospheric boundary layer electric state and the variability of electric parameters are discussed. As a result of the field observations and numerical modeling, it is found that the development of convection in the atmospheric boundary layer reduces the electric conductivity near the surface. The stochastic electrodynamic model, reproducing the evolution of the vertical profiles of electric conductivity and aeroelectric field intensity in the lower troposphere of mid-latitudes land undisturbed by precipitations and thunderstorms, is used for the calculations. The results show that the increased turbulence generation due to convection accompanied by an increase of the turbulent kinetic energy and the variance of vertical turbulent velocity tends to more intensive vertical mixing of radon and its short-lived daughters. In this case, the turbulent transport of radon leads to more uniform vertical distribution of the electric conductivity and an increase of the aeroelectric field intensity in the surface layer. Estimations of the variability of electric conductivity and aeroelectric field intensity, caused by radon emissions, air ionization, charge separation on the electric conductivity inhomogeneities, turbulent transport of radioactive elements and space charge, are performed. It is assumed that altitudinal aeroelectric profiles can be objective and operative parameters of the atmospheric boundary layer turbulent conditions.

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