北京限行期间大气污染物的差分光学吸收光谱监测与分析

Monitoring and Analysis of Atmospheric Pollutants in Traffic Ban Period of Beijing with DOAS

利用差分光学吸收光谱技术于2007年8月对北京市朝阳区大气污染物进行了实时监测,对大气中重要常规污染物NO2、SO2和O3的日变化特征、与天气条件之间的关系和各污染源进行了分析和探讨.通过分析污染物在"好运北京"奥运限车期间(8月17～20日)与限车前后(8月16、21日)的浓度变化,对机动车限行效果进行了讨论.结果表明,监测点NO2主要来源于汽车尾气,以凌晨和上午时段污染最重,并对O3的来源有着一定的贡献;SO2主要来源于西南方向的污染源,较强风速时北风有利于其浓度的降低;结果还显示机动车限行可有效降低NO2、SO2浓度,分别达到28.34%和25.87%;但是因导致O3被消耗量降低,致使O3浓度上升.

Based on the differential optical absorption spectroscopy （DOAS） technology, measurements of atmospheric pollutants were carried out continuously in Aug. 2007 in Chaoyang District of Beijing. Diurnal variation characteristics of pollutants and sources are analyzed. And relations between pollutants and meteorological conditions are discussed. Moreover, the concentrations of NO2, SO2 and O3 in the period of “Good Luck Beijing” Olympic test games （traffic ban August 17-20 and no traffic ban August 16, 21） are given emphasis to analyze. Results indicated that automobile exhaust is the main source of NO2, and the concentration of NO2 is high in the a.m. and wee hours. It can be also found that NO2 contributes part to the O3 formation. SO2 came mainly from the southwest and the concentration of SO2 decreased with the north wind. Traffic ban reduced the levels of NO2, SO2 of 28.34% and 25.87%, respectively. While the levels of O3 increased.