傅里叶红外系统监测大气中温室气体的污染特征  

Monitoring of Pollution Characteristics of Atmospheric Greenhouse Gases Using Fourier Infrared System

作　　者：吕永雪 张天舒 范广强 项衍 程节 吕立慧 LüYongxue;Zhang Tianshu;Fan Guangqiang;Xiang Yan;Cheng Jie;LüLihui(Institute of Physical Science and Information Technology,Anhui University,Hefei 230601,Anhui,China;Key Laboratory of Environmental Optics and Technology,Anhui Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Hefei 230031,Anhui,China)

机构地区：[1]安徽大学物质科学与信息技术研究院,安徽合肥230601 [2]中国科学院安徽光学精密机械研究所环境光学与技术重点研究室,安徽合肥230031

出　　处：《中国激光》2023年第6期156-164,共9页Chinese Journal of Lasers

基　　金：安徽省重点研究与开发计划(202004i07020002);合肥市自然科学基金(2021046)。

摘　　要：研制了一套90 m的开放光路傅里叶变换红外光谱(OP-FTIR)温室气体分析测量设备,并利用该设备开展了CO_(2)、CH_(2)和CO质量浓度的高精度检测。OP-FTIR系统反演CO_(2)、CH_(2)和CO的光谱区域分别为2102~2250 cm^(-1)、2920~3140 cm^(-1)和2172~2210 cm^(-1)。以采集到的中红外吸收光谱为反演基准,开展了与Picarro温室气体分析仪的对比测试。选取测量期间10 d的数据,研究了温湿度、风向风速与环境大气中CO_(2)、CH_(2)和CO质量浓度的关联度,并详细分析了污染物的日变化特征。实验结果表明:研制的OP-FTIR光谱系统监测温室气体质量浓度具有较高的可靠性;温度、相对湿度、风速和风向对当地污染物质量浓度影响显著;CO_(2)、CH_(2)和CO质量浓度的时序变化具有明显的周期性变化趋势。将CO、CH_(2)质量浓度分别与CO_(2)质量浓度进行相关性分析,相关系数分别为0.495和0.659。Results and Discussions A comparison of the mass concentrations of CO_(2),CH_(2),and CO measured by the Picarro greenhouse gas analyzer and atmospheric OP-FTIR system yields correlation coefficients of 0.896,0.840,and 0.906 for CO_(2),CH_(2),and CO mass concentrations,respectively,indicating the high reliability and accuracy of the atmospheric OP-FTIR system for monitoring greenhouse gas mass concentrations(Fig.3).The results of the measured spectral fits show that the inversion spectral regions of 2102-2250 cm^(-1),2920-3140 cm^(-1),and 2172-2210 cm^(-1) selected for CO_(2),CH_(2),and CO have root mean square errors of the spectral fit residuals of approximately 0.102%,1.359%,and 0.551%,respectively(Fig.4).In terms of meteorological conditions,the mass concentration indices of CO_(2),CH_(2),and CO show significant negative correlations with wind speed and temperature in most cases and positive correlations with humidity,with high mass concentrations of pollution mainly in the westerly and northwesterly wind directions(Figs.6 and 7).In general,the daily average mass concentrations of CO_(2),CH_(2),and CO were 823.470 mg?m-3,1.330 mg?m-3,and 0.510 mg?m-3,respectively.The mass concentrations of CO_(2),CH_(2),and CO in the ambient atmosphere vary periodically,in terms of mass concentration time series(Fig.8).The correlations between the CO and CH_(2) mass concentrations and CO_(2) mass concentrations were analyzed,yielding correlation coefficients of 0.495 and 0.659,respectively(Fig.9).The boundary-layer inverse temperature effect,intensity of atmospheric convection,and photochemical reactions are the main causes of the variations in CO and CH_(2) mass concentrations.The main factors causing the variation in CO mass concentrations are photosynthesis in plants,photochemical reactions,convective air transport,and motor vehicle emissions.Objective Curbing global warming and reducing greenhouse gas emissions have become important issues that urgently require worldwide attention.Therefore,the establishment and improvemen

关 键 词：光谱学 大气温室气体污染特征 开放光路傅里叶红外光谱 二氧化碳 甲烷 一氧化碳 

分 类 号：TN219[电子电信—物理电子学] O433.4[机械工程—光学工程]