北京秋季地面O_3的一维模式模拟研究

Simulation Experiments on Surface Ozone and Its Precursors in Autumn with One-Dimension Model

用一维光化学模式，基本模拟出静稳天气条件下2001年9月9日北京几个主要大气污染物种：O3、NO、NO2、CO以及SO2的日变化特点，并解释了影响O3及NO、NO2、CO和SO2日变化的控制因子作用。初步分析认为，地面O3对非甲烷碳氢化合物（NMHC）的变化很敏感。NMHC的增加或减少，将会造成O3的明显改变。造成9月9日夜间20：00～23：00一次污染物NO、CO和SO2浓度急剧升高的原因是由于夜间大气层结稳定情况下，大气的垂直扩散减弱，污染物在底层积累造成的。由于实际大气中，影响O3生成和损耗的机制很复杂，同时大气的平流输送是影响O3及其他污染物分布的重要因素，用一维模式虽然能够揭示出影响O3变化的几个因子的作用，但要深入分析O3产生和消耗机制，还需要用三维模式。

With one-dimension photochemical model, the simulation is conducted on the diurnal variation of O3, NO, NO2, CO and SO2 on 9 September 2001 in stable weather and the controlling factors for the diurnal change are explained. The preliminary analysis shows that the O3 concentration is sensitive to non-methane hydrocarbon （NMHC）. The increase or decrease of NMHC concentration results in the distinct variation of ozone concentration. The cause of NO, CO and SO2 concentration increase from 20：00 to 23：00 on 9 September 2001 is the weak vertical diffusion and accumulated pollutants at the lower atmosphere at night. The producing and depleting mechanisms of O3 are complex and the transportation is important for O3 and its precursors. Though one-dimension model can reveal the main factors influencing O3 concentration, the three-dimension model is needed to explain more phenomena. These conclusions are derived only from a few experiments. The O3 pollution in summer over Beijing is very complex, needing further study and validation.