Variability of radon distribution in the atmospheric surface layer over the land of middle latitudes

Turbulence, Atmosphere and Climate Dynamics

生态环境科学

Anisimov, S.V.^1 ; Dmitriev, E.M.^1 ; Aphinogenov, K.V.^1 ; Guriev, A.V.^1 ; Kozmina, A.S.^1

Borok Geophysical Observatory of Schmidt Institute of Physics of the Earth, Russian Academy of Sciences, Russia^1

关键词: Altitude profiles;    Atmospheric surface layers;    Continuous fields;    Near surfaces;    Radon flux;    Turbulent diffusion coefficients;    Turbulent transports;    Wind velocities;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/231/1/012006/pdf
DOI  :  10.1088/1755-1315/231/1/012006

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

The variability of radon distribution in the surface atmosphere is investigated by numerical modeling of radon turbulent transport, based on the data of continuous field natural observations. The boundary conditions, including the radon flux from the surface and radon volumetric activity variation near the surface, were set according to the observations. Variations of turbulent diffusion coefficient altitude profiles were calculated by the observations of wind velocity pulsations at two altitudes made synchronously on the same location. The altitude profiles of radon volumetric activity typical for the atmospheric surface layer over the land of middle latitudes are obtained. It is shown that the radon volumetric activities at any altitudes vary concurrently, but the near-surface radon volumetric activity are greater than one at 10 m. The relative difference between them varies from 10 % (near local midnight) to 120 % (near local midday). The most considerable increase of the radon volumetric activity gradient occurs below 2 m.