兰州城区冬季大气污染物日变化的数值模拟

Numerical Simulation of Diurnal Variations of the Air Pollutants in Winter of Lanzhou City

摘要: 应用嵌套网格空气质量预报模式系统（NAQPMS），模拟研究了兰州市2006年12月大气污染的日变化特征及其影响因素。在复杂地形条件下，兰州城区冬季大气污染日变化呈现白天高、夜晚低、峰值在中午的特点，NAQPMS较为合理地再现了这一特征。分析表明，在兰州冬季低风速的情况下，逆温出现频次的日变化特征与污染的日变化特征保持一致，说明逆温在冬季大气污染日变化中的作用显著。

Abstract: A heavy pollution case in December 2006 in Lanzhou was simulated using the Nested Air Quality Prediction Model System (NAQPMS). The diurnal variations of the air pollutants and its mechanism were discussed. The results showed that NAQPMS can reproduce the temporal and spatial variations of the air pollution under complex terrain conditions. The concentrations of the pollutants presented a pattern with daytime maximum and night minimum, which can be explained by the daytime nearsurface temperature inversion layer.