基于机载与车载差分吸收光谱技术同步观测的污染源NO_x排放通量的分析  

Analysis of the Emission Flux of Pollution Source NO_x Based on Synchronous Observation of Airborne and Vehicular Differential Optical Absorption Spectroscopy Technique

作　　者：杨东上 曾议 奚亮 周海金[1] 邱晓晗 罗宇涵 司福祺[1] 刘文清[1] Yang Dongshang;Zeng Yi;Xi Liang;Zhou Haijin;Qiu Xiaohan;Luo Yuhan;Si Fuqi;Liu Wenqing(Key Laboratory of Environmental Optics and Technology,Anhui Institute of Optics and Fine Mechanics,Hefei Institutes of Physical Science,Chinese Academy of Sciences,Hefei,Anhui 230031,China;University of Science and Technology of China,Hefei,Anhui 230026,Chin)

机构地区：[1]中国科学院合肥物质科学研究院安徽光学精密机械研究所环境光学与技术重点实验室,安徽合肥230031 [2]中国科学技术大学,安徽合肥230026

出　　处：《光学学报》2020年第5期17-27,共11页Acta Optica Sinica

基　　金：国家重点研发计划(2016YFC0200401,2017YFB0503901)。

摘　　要：研究一种基于机载和车载被动差分吸收光谱(DOAS)技术测量大气污染气体排放通量的光学遥测方法。利用机载成像光谱仪和车载DOAS光谱仪对工业区进行同步走航观测,利用光谱反演获得区域NO2垂直柱浓度分布情况及扩散趋势,然后根据实时风场数据,结合NOx在大气中的衰减模型,推导出NOx衰减情况及氮氧化物各成分占比,进而获得污染源NOx的排放通量。所提方法修正了NOx在大气中的衰变,计算了该工业园区电厂和钢厂的NOx排放通量分别为3.3331×1024 molecule·s-1和2.6138×1024 molecule·s-1。结果表明:机载和车载观测结果的一致性较好,与未经修正NOx衰变获得的排放通量相比,所提方法获得的排放通量精度提高了约5%~20%。与车载或机载独立观测方式相比,所提方法结合了机载扫描范围大和车载探测空间分辨率高的优点,更有利于对污染扩散趋势的掌握,提高了探测精度。In this study, an optical telemetry method based on airborne and vehicular passive differential optical absorption spectroscopy(DOAS) technology to measure the emission flux of atmospheric pollution gas is studied. This method use an airborne imaging spectrometer and vehicular DOAS spectrometer to synchronously observe navigation within an industrial area. The distribution and diffusion trend of NO2 vertical column concentration in this region are detected through spectral inversion. By utilizing the real-time wind field data and attenuation model of NOx in the atmosphere, the NOx attenuation and the proportion of each component of nitrogen oxides are derived, and thus the emission flux of pollution source NOx is obtained. The NOx attenuation in the atmosphere is corrected by using the proposed method. The NOx emission fluxes of the power and steel plant in the industrial park are calculated to be 3.3331×1024 molecule·s-1 and 2.6138×1024 molecule·s-1, respectively. The results show a consistency in airborne and vehicular observations. Compared with the emission flux computed by the uncorrected NOx attenuation, the emission flux accuracy of proposed method has significantly improved by 5%--20%. Compared with the vehicle or airborne independent observation method, proposed method combine the advantages of large scanning range for airborne detection and high spectral resolution for vehicle detection, which is conducive in tracking pollution diffusion and can improve the detection accuracy.

关 键 词：大气光学 差分吸收光谱技术 车载光谱仪 机载光谱仪 氮氧化物 排放通量 排放比 

分 类 号：X831[环境科学与工程—环境工程]