基于被动差分吸收光谱技术对重庆市大气污染物区域输送的探测研究

在重庆市大气污染区域输送通道上设置龙市站、超级站、南坪站三个观测站点,利用基于被动DOAS技术的MAX-DOAS地基多轴差分吸收光谱仪对SO2和NO2垂直柱浓度进行连续探测,实时获取两种大气污染物的时空分布和区域性输送过程,并将MAX-DOAS探测结果与当地API数据进行了对比分析。探测结果显示,龙市站、超级站、南坪站NO2垂直柱浓度均值分别为5.90×1015、18.96×1015、17.82×1015molec./cm2,超级站最高,龙市站最低;SO2垂直柱浓度均值分别为16.46×1015、18.35×1015、55.56×1015molec./cm2,南坪站最高,龙市站最低;分析研究表明,NO2受本地交通排放源影响为主,SO2则受周边工业污染源排放的影响较大。

A Study on Regional Transport of Atmospheric Pollutants in Chongqing based on Technology of Passive Differential Optical Absorption Spectroscopy

Three monitoring sites, namely Longshi site, supersite, Nanping site, were arranged in the transport pathway of atmospheric pollutants in Chongqing. Vertical column concentration of SO2 and NO2 was detected contin-uously with MAX-DOAS ground-based multi-axis differential absorption spectrometer and results were compared to local API data. Real-time spatial and temporal distributions of both pollutants as well as their regional transport pro-cess were observed. It was found that the average vertical column concentration of NO2 at Longshi site, supersite and Nanping site was 5.90 ×10^15、18.96 ×10^15、17.82 ×10^15 molec./cm2, respectively, with supersite having the highest NO2 concentration and Longshi site the lowest. In comparison, the average vertical column concentration of SO2 was 16.46 ×10^15、18.35 ×10^15、55.56 ×10^15 molec./cm2 at sites in the same order and the highest and lowest SO2 concentra-tion appeared at Nanping site and Longshi site, respectively. Analysis indicated that NO2 mainly come from local traf-fic emissions, while SO2 was greatly influenced by surrounding industrial emissions.