奥运期间北京城区的开放式NH_3激光在线监测  

Atmospheric NH_3 On-Line Monitoring in Urban Area of Beijing During Olympic Games by Open-Path Laser Techniques

作　　者：何莹[1] 张玉钧[1] 刘建国[1] 阚瑞峰[1] 

机构地区：[1]中国科学院安徽光学精密机械研究所中国科学院环境光学与技术重点实验室,安徽合肥230031

出　　处：《大气与环境光学学报》2009年第5期356-361,共6页Journal of Atmospheric and Environmental Optics

基　　金：中国院知识创新重要方向性项目(KJCX2-SW-W27)资助

摘　　要：NH_3是大气成分中最丰富的碱性痕量气体,对中和大气酸性成分以及气溶胶的形成起重要作用。使用基于可调谐半导体激光吸收光谱和开放长光程技术的NH_3在线监测系统对北京奥运期间鸟巢附近城区进行了NH_3浓度的连续监测。监测结果表明NH_3浓度具有明显的日变化周期,基本规律是白天浓度降低,夜晚浓度升高到峰值;NH_3的日峰值浓度从北京奥运开始有所下降。研究表明北京城区机动车限行对减小NH_3浓度和抑制气溶胶的形成起到了积极作用。NH3 is the most abundant alkaline trace gas in the atmosphere which plays an important role in acid deposition and aerosol formation. The NH3 on-line monitoring system based on tunable diode laser absorption spectroscopy and long open path technology was used to continuously measure atmospheric NH3 concentration at an urban site near Beijing National Stadium during Beijing Olympic Games. The monitoring results show that the atmospheric NH3 concentration variation has an obvious diurnal periodicity, the rule is the concentration decreased in the daytime, and increased to the maximum at night. Moreover, the NH3 peak concentration decreased at the beginning of Beijing Olympic Games. The results reveal the positive effects of auto restriction for reducing NH3 concentration and restricting aerosol formation.

关 键 词：激光吸收光谱 NH3 机动车限行 

分 类 号：X831[环境科学与工程—环境工程]