天气和气象条件对移动mini-DOAS系统测量污染源排放的影响探讨

介绍了北京奥运前利用一套微型被动差分吸收光谱学(mini-DOAS)系统,测量和估算北京市石景山区1个点源和1个面源SO2排放量的实验,探讨了应用该系统测量和估算排放量过程中的重要影响因素,尤其是天气和气象条件的作用.研究发现: (1)测量应当在中尺度天气系统的稳定控制下进行,而天气系统调整阶段由于局地山谷风的干扰,不易获得可靠的测量结果;(2)在混合层高度低、近地面几百米风速小的情况下,可以获得更为准确的测量值;(3)在推算点源排放量时,应选择排放高度上的风速和风向.

Influence of Meteorological Factors on the Measurements and Estimation of Pollutant Emission Using a Mobile Mini-DOAS System

Experiments for estimation of SO emissions from one point-source and one area-source in Shijingshan District, Beijing were introduced, in which a mobile mini-DOAS system was employed to study the environmental prerequisites for its application. A comparison among meteorological conditions for each experiment indicates that, (1) a mid-scale weather system was necessary for measurement so as to avoid local mountain-valley winds; (2) when mixing height and wind velocity were low, more accurate measurements can be obtained and are closer to statistical values from the local authority; (3) using wind direction and velocity at emission height yielded a better estimation of pollutant emission of the point source.