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KMID : 1024519940030030241
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Journal of the Environmental Sciences
1994 Volume.3 No. 3 p.241 ~ p.252
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A Study on the Diffusion of Atmospheric Pollutants over Taegu
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Yoon Ill-Hee
Min Kyung-Duck
Park Dong-Jae
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Abstract
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Meteorological parameters In the atmospheric boundary layer and the vertical and horizontal dispersion parameters were determined by analyzing the data obtained by the special upper-air observations of one clear day for each season from October 1991 to August 1992. The concentration of the aklospheric pollutants over Taegu was analyzed by using the application of the Gaussian diffusion model. In the diurnal variation of diffusion of atmospheric pollutants, vertical diffusion due to turbulence is active in daytime while horizontal diffusion due to wind is active in nighttime. The mean concentration of pollutants in the side of downwind is higher during the daytime than the nighttime. Thus, the height of the mixed-layer at the nighttime considered as the most important parameter of the mean concentration of pollutants. In the seasonal variation of diffusion of atmospheric pollutants, vertical diffusion due to strong solar radiation is active in summer case day, and horizontal diffusion due to strong wind is active in winter case day. In winter case day, the mean concentration of pollutants in the side of downwind is maximum in the daytime. However, in summer case day, that is maximum in the nighttime.
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KEYWORD
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dispersion parameters, atmospheric boundary layer, Gaussian diffusion model, atmospheric pollutants, concentration of pollutants
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