北京冬季大气SO2、NO2与O3的监测与分析

利用差分光学吸收光谱(DOAS)技术于2006年2月对北京市丰台区的常规污染气体SO2、NO2及O3进行了连续监测,并对各污染物的日变化特征和污染源进行了分析和探讨.结果表明,丰台区NO2主要与汽车尾气的排放有关,以早晨和傍晚的上下班时段最重,凌晨和午后最轻;SO2浓度的日变化状况是气象条件日变化和污染源排放量日变化综合影响的结果,分别在早晨和夜间达到最大值,日变化曲线呈现"N"字型双峰结构;由O3和NO2的相关性分析可知,NO2对大气中O3的含量有着一定的贡献,大气中可能还存在其它重要的O3前体污染物.

Monitoring and analysis of SO2, NO2 and O3 in Winter of Beijing

Based on the differential optical absorption spectroscopy (DOAS) technology, measurements of SO2, NO2 and O3 were carried out continuously in Feb. 2006 in Fengtai District of Beijing and their diurnal variation characteristics and sources are analyzed. Results indicated that automobile exhaust is the main source of NO2. The concentration of NO2 is high in the morning and evening during heavy traffic and low at dawn and afternoon. The diurnal variation of SO2 concentration has the same shape as letter "N". In morning and midnight SO2 concentration is high, which results from variation of the meteorology and sources. From the analysis of correlation of O3 and NO2, It can be found that NO2 contributes to the O3 formation and there are some other important precursors for O3.