摘要
本文通过实例资料分析和复杂地形上三维平流扩散方程模式的模拟，讨论了影响河谷城市兰州大气污染物浓度变化的气象因子。实例资料表明，冬季ＳＯ２浓度的变化与温度层结和风速差别相联系。本文建立的三维扩散模式，模拟值与实例值符合较好，并能显示出不同气象条件对污染物浓度的影响。参数敏感性试验表明：（１）Ｋｚ、风向、风速对地面浓度及其分布有很大影响。（２）Ｋｈ对地面浓度的分布也有一定的影响。（３）厚的贴地逆温和底部较低的低层逆温使地面浓度显著增加，而逆温层底部较高时，对地面浓度无显著影响。
The meteorological factors which affect the air pollutants concentration of Lanzhou are discussed by analysis of observed data and a three-dimensional diffusion model over complex terrain. The analysis of observations indicates that the change of the SO2 concentration is determined by the difference of stratification and wind speed in Lanzhou. The model, which has been adjusted to suit Lanzhou, the valley city, is tested to have betteraccuracy and high stability. The numerical results agree favorably with the observation, and indicate that the model is capable of dealing with the variation of meteorological condition.The sensitivity tests demonstrate that: (1) Kh , wind speed and wind direction affect the surface concentration and its distribution (2) To some extent, Kh also determines the surface concentration and distrbution. (3) The surface concentration will increase when the groundlevel inversion is strong and thick or the inversion base is maintained at a lower-level. But the inversion base which is high has little effect on the surface concentration.
出处
《兰州大学学报（自然科学版）》
CAS
CSCD
北大核心
1994年第4期143-151,共9页
Journal of Lanzhou University(Natural Sciences)
基金
国家自然科学基金
关键词
空气污染
数值模拟
大气环境
气象条件
air pollution
numerical simulation
atmospheric environment
meteorologieal condition
