雾对SO_2烟羽清除作用的研究

在雾稳定的条件下,研究了雾滴穿过SO_2烟羽沉降到地面的过程中吸收、析解以及酸化等过程。结果表明,雾对烟羽中SO_2的清除具有某些奇特的现象。即仅在离源较远的区域才表现出有限的清除作用:而在近源区,主要以析解为主,使源附近地面SO_2浓度增加,高架源成了低架源。雾滴在地面附近的这种析解作用,是造成雾天污染物浓度高的重要原因之一。

Study on the Effect of Fog on Scavenging SO_2 Plume

Under the stable stage of fog episode, the process of absorption, desorption and acidification of fog droplets dropping through SO_2 plume were studied. The result showed that in the remote down-wind distance zone, there was only weak scavenging effect of fog on SO_2 plume in the near source region, the droplets were in the state of desorption and, SO_2 concentration increased gradually during foggy time, that's equivalent to the elevated source changed to lower source. So desorption of fog droplets near the ground is an important factor effected on air quality during foggy condition.