Estimating atmospheric diffusion parameters based on Eulerian observation

Wind speed was observed in summer(from August 25 to September 13,2005) and in winter(March 20—29,2007) with ultrasonic anemometer in Dashitou town,Dunhua city,Jilin province.Based on the statistical theory of turbulent diffusion parameters,the atmosphere diffusion parameters of normal diffusion model were calculated by Eulerian observation.The results indicate that σy value and σz value under different atmospheric stabilities(B,C,D,E and F types) decrease in the summer of 2005 and in the winter of 2007.The total diffusion level of transverse y-axis is higher than that of vertical z-axis.σy values under B,C and D types in summer are higher than those in winter,which becomes obvious with the increase of horizontal distances.σy values in summer are less than those in winter when x equals 100 m.Compared with σy values in winter,σy values in summer increase rapidly with the increase of horizontal distance for E stability and F stability.σz values under B,C,D,E and F stabilities in summer are higher than those in winter,which become obvious with the increase of horizontal distances.This method is feasible and practical.And it can be used as a parameter selection reference of atmospheric turbulence diffusion rule and pollution model in this area.