An LP-DOAS instrument with a laser driven light source for open-path measurement of atmospheric NO2 in Shanghai

Mingzhi Li, Jun Chen, M. Su, Huinan Yang, Arun Ramachandran, R. Varma
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引用次数: 1

Abstract

Shanghai is currently faced with the complex atmospheric pollution problem such as ozone (O3) and PM2.5. O3 is responsible for oxidization of atmospheric constituents that in turn produces secondary pollutants. Reducing atmospheric oxidation is the underpinning strategy for the prevention and control of pollution in this city. According to the observation data from the online automatic monitoring station of Shanghai, the city's O3 concentration has been rising steadily. In 2013, there are 100 days with ozone as the main pollutants, accounted for 31.9%. By Leighton relationship (K6[O3][NO]=K4[NO2] = 1), concentration of O3 is closely related to that of NO2. So, continuous monitoring of atmospheric NO2 has important significance. An instrument was developed for measuring atmospheric NO2 concentration using a powerful light source in conjunction with the long-path differential optical absorption spectroscopy (LP-DOAS) technique. This system installed at the central section of Shanghai used a laser driven light source (LDLS) and a sensitive TE cooled spectrometer. The LDLS showed better stability, high optical efficiency when compared to traditional arc lamp and light emitting diodes. The light sent into the atmosphere was returned by a retro reflecting mirror placed 1.3km away, and the light returned was sent to a high sensitive TE cooled spectrometer. The spectral range of measurement was 415–455nm and the spectra collected were averaged over 10 min, prior to analyzing for NO2 concentration. Continuous observations were carried out for two weeks and the NO2 concentration retrieved ranged from (20–600) ug/m3 with an estimated detection limit of 6.77 ug/m3. The measurement results indicate that it is feasible to use this instrument for detecting the NO2 with high spatial and temporal sensitivity.
基于激光驱动光源的LP-DOAS仪器在上海开放路径大气NO2测量中的应用
上海目前面临着臭氧(O3)、PM2.5等复杂的大气污染问题。臭氧负责氧化大气成分,从而产生二次污染物。减少大气氧化是该市污染防治的基础策略。根据上海在线自动监测站的观测数据,该市的O3浓度一直在稳步上升。2013年以臭氧为主要污染物的天数为100天,占31.9%。根据Leighton关系式(K6[O3][NO]=K4[NO2] = 1), O3的浓度与NO2的浓度密切相关。因此,对大气NO2进行持续监测具有重要意义。结合长程差分光学吸收光谱(LP-DOAS)技术,研制了一种利用强光源测量大气NO2浓度的仪器。该系统安装在上海中部,使用激光驱动光源(LDLS)和灵敏的TE冷却光谱仪。与传统的弧光灯和发光二极管相比,LDLS具有更好的稳定性和更高的光效。发射到大气中的光被放置在1.3公里外的一个复古反射镜返回,返回的光被发送到一个高灵敏度的TE冷却光谱仪。测量光谱范围为415-455nm,采集的光谱在10 min内取平均值,然后进行NO2浓度分析。连续观察2周,测得NO2浓度范围为(20 ~ 600)ug/m3,检出限为6.77 ug/m3。测量结果表明,该仪器具有较高的时空灵敏度,是一种可行的NO2探测方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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