The diurnal change in the vertical distribution of atmospheric ~(222)Rn due to the growth and rise of the stable stratification height in the atmospheric boundary layer

摘要

To analyze the time-change of ~(222)Rn vertical distribution in the atmospheric boundary layer, ~(222)Rn was continuously measured at 3 different heights - 30, 150 and 520 m - within a 6-km radius. The air temperature was synchronously observed at 4 different heights - 1,33,160 and 520 m - at the same site and then the vertical distribution of temperature lapse rates calculated from these measurements. The time-change of ~(222)Rn vertical distribution could be attributed to the time-change of the vertical distribution of the temperature lapse rate. On the basis of this relationship, the mechanism of ~(222)Rn vertical mixing has been generalized as a mixing model in the atmospheric boundary layer.