基于傅立叶红外变换技术的温室气体在线监测仪在龙凤山大气温室气体本底站的应用

摘要/Abstract

摘要： 大气温室气体的监测，是掌握温室气体浓度时空变化特征及其影响因素依据。而大气本底监测反映了较大范围内,因人类活动而造成的大气成份长期变化，是温室气体监测的基础数据。大气本底站附近温室气体浓度相对较低，年变化范围小，从而对温室气体连续监测技术精度与稳定性提出了更高的要求。本文基于傅立叶红外技术与WHITE型多次反射池技术方法，研究大气本底温室气体CO2、CH4、N2O超低浓度检测系统。针对CO2、CH4、N2O的分子吸收光谱特征，采用碳化硅作为光源，将测量波段选择在1900-2600区间；采用模拟仿真，模拟不同透过系数和多种气体混合干扰状态下的仪器理论测量精度，根据验证结果，傅里叶红外仪器在CO2、CH4、N2O测量方面表现良好，满足超低浓度温室气体的监测需求。

关键词: 傅立叶变换红外光谱, 温室气体, 大气本底, 监测

Abstract: Atmospheric background monitoring reflects the long-term changes of atmospheric composition caused by human activities in a large area. It is the basic data for studying the spatio-temporal variations of greenhouse gas concentrations and their influencing factors. The concentration of the greenhouse gas near atmospheric background station is relatively low and varies slightly annualy, requiring more accuracy and stability form the gas minitoring instruments. Based on the Fourier infrared technology and the WHITE multi-reflection cell technology, this paper developed a greenhouse gas on-line monitoring system. According to the molecular absorption spectra of CO2, CH4 and CO, silicon carbide is used as the light source, and the measurement band is selected in the range of 1900-2600. With a month's running at LONGFENGSHAN base station,the result is in accordance with PICARO instrument's result.And it meets the requirements of atmospheric background measurement of greenhouse gases.

Key words: Fourier transform infrared spectroscopy, greenhouse gases, atmosphere background, monitoring

张晓春,宋庆利,曹永，王鹏，于大江,王缅，温民. 基于傅立叶红外变换技术的温室气体在线监测仪在龙凤山大气温室气体本底站的应用[J]. 大气与环境光学学报, 2019, 14(4): 279-288.

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