而大雾天气抑制了近地面层污染物的垂直扩散，加剧了城市污染。
The heavy fogs restrain the vertical diffusion of surface layer pollutant and get tough city...
利用动力学方程组，并对其中垂直梯度项和垂直扩散项进行了参数化处理。
Dynamic equations are used in which the vertical gradient and vertical diffusion are parameterized.
发现由于垂直扩散较强，最大浓度常于近源处发生，且向下风方浓度衰减较快。
It is found that the maximum concentration often occurs near source through intensive vertical diffusion, and the values of concentration decrease with the distance downwind rather rapidly.
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