摘要
文中利用CAPPS模式进行了模拟试验 ,试图研究在不同环流背景下 ,太原附近簸箕型地形对该地主要污染物(SO2 ,NOx,PM10 )稀释扩散的影响。结果表明 :采用仿真模式地形 ,局地环流背景下 ,簸箕型地形阻碍了主要污染物的稀释和扩散 ,加剧近地层空气的污染 ;大尺度环流背景下 ,且地面为偏南风或偏东风时 ,簸箕型地形有助于主要污染物的稀释和扩散 ,SO2 ,NOx,PM10 浓度减小 ,地面为偏北风或偏西风且风速≥ 5m /s时 ,SO2 ,NOx 浓度减小 ,PM10 浓度剧增。此外 ,还探讨了簸箕型地形对太原市主要污染物稀释扩散作用的机制 ,采用仿真模式地形 ,大尺度环流背景时 ,簸箕型地形对垂直运动具有增幅作用 ,且地形越高 ,增幅越明显。
In this paper the author uses CAPPS model system to make simulation exper iments. It aims at studying the influence of dustpan shaped ferrain on dilution and dif fusion of main pollutants such as SO 2, NO x and PM 10 in Taiyuan City und er the control of different circulations. The results showed that in the emulate d orographic scheme, controlled by local scale circulation, the dustpan shaped terrain inhibited dilution and diffusion of main pollutants and aggravated the ai r pollution in ground layer; while controlled by large scale circulation and was a southerly or easterly wind in ground layer, the dustpan shaped terrain dilut i on and diffusion of main pollutants and the density of main pollutants decreased , but when there was a northerly or westerly wind in ground layer and wind speed ≥5 m/s, the density of SO 2 and NO x decreased and the density of PM 10 increased sharply. As a result, in the emulated orographic scheme, influenced b y large scale circulation, the dustpan shaped terrain promotes vertical motion. The higher the terrain, the more obvious the increase.
出处
《气象学报》
CAS
CSCD
北大核心
2004年第1期112-118,共7页
Acta Meteorologica Sinica
关键词
污染物
稀释扩散
模式地形
模拟试验
Model topography, Simulation experiments, Pollutan ts, Dilution and diffusion.
