首页|基于LICOR-830与Picarro G2301的温室气体分析仪精度对比研究

基于LICOR-830与Picarro G2301的温室气体分析仪精度对比研究

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在应对气候变化和实现"双碳"战略过程中,需要对温室气体进行高精度的观测,而目前在实验室关于量化不同观测系统精度差异的研究相对较少.本研究选择基于非色散红外吸收法的LICOR-830 型CO2气体分析仪与基于光腔衰荡光谱法的Picarro G2301 型CO2/CH4/H2 O气体分析仪,对 3 种CO2可溯源标气进行观测,开展重复性测试、漂移测试和目标标气测试,并对观测浓度进行精度对比分析.测试结果为1)重复性测试:LICOR-830 的精度约为0.4 ppm,Picarro G2301 的精度约为0.04 ppm,两者精度相差一个数量级;2)漂移测试:LICOR-830 准确度为-4.22%,Picarro G2301 准确度为 0.82%,两者准确度相差 5 倍;3)目标标气测试:用3 种浓度的标气对实测浓度进行1h的校正后,LICOR-830 精度提升15 倍,达到0.026 ppm,准确度为-0.11%,Picarro G2301 的精度略有提升,达到0.0341 ppm,准确度为0.03%.结果显示,LICOR-830 的精度水平在校正后可满足WMO对CO2观测的精度要求,具有较大的应用潜力.
COMPARATIVE STUDY ON THE PRECISION OF GREENHOUSE GAS ANALYZERS BASED ON LICOR-830 AND PICARRO G2301
In the process of coping with climate change and realizing carbon peaking and carbon neutrality goals,high-precision observations of greenhouse gases are required.However,relatively few studies have been conducted in laboratories on quantifying the precision differences of different observation systems.In this research,the LICOR-830 CO2 gas analyzer based on non-dispersive infrared absorption method and the Picarro G2301 CO2/CH4/H2 O gas analyzer based on cavity ring-down spectroscopy method were selected to observe the three traceable standard CO2 gases and conduct repeatability tests,drift tests,target calibration gas tests.The accuracy of the measured concentration was compared and analyzed.The test result are as follows:1)Repeatability test:the precision of LICOR-830 is about 0.4 ppm,and the precision of Picarro G2301 is about 0.04 ppm.There is one order of magnitude difference between them.2)Drift test:the accuracy of LICOR-830 is-4.22%,and the accuracy of Picarro G2301 is 0.82%.The accuracy difference between the two is five times.3)Target standard gas test:after 1h calibration of the measured concentration with concentrations of three standard gases,the precision of LICOR-830 increased by 15 times,reaching 0.026 ppm,and the accuracy was-0.11%.The precision of Picarro G2301 was slightly improved,reaching 0.0341 ppm,and the accuracy was 0.03%.The results show that the precision of LICOR-830 after calibration can meet the precision requirement that WMO recommended for CO2 measurement after calibration,which has great application potential.

LICOR-830Picarro G2301greenhouse gasesprecision comparison

南瑞琪、田彪、孙维君、朱孔驹、张文千、汤洁、丁明虎

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山东师范大学地理与环境学院,250358,济南

中国气象科学研究院全球变化与极地研究所,100081,北京

LICOR-830 Picarro G2301 温室气体 精度对比

2024

山东师范大学学报(自然科学版)
山东师范大学

山东师范大学学报(自然科学版)

影响因子:0.145
ISSN:1001-4748
年,卷(期):2024.39(1)