新型CO2和CH4混合标气标校流程及方法

A NEW SYSTEM FOR CALIBRATION AND PROPAGATION OF MIXED CO_2 and CH_4 STANDARDS

基于光腔衰荡法Picarro G-1301型甚高分辨率分析仪自组装新型CO2和CH4混合标气标校系统,研究建立了简便高效的标校流程和方法.该系统操作简便,运行稳定,工作标气消耗更少,线性好,对环境大气浓度范围的CO2和CH4的分析精度分别优于0.06×10-6mol.mol-1和0.3×10-9mol.mol-1,准确度分别在±0.05×10-6mol.mol-1和±0.4×10-9mol.mol-1内,满足世界气象组织全球大气观测网(WMO-GAW)对温室气体分析标校及标气分级传递的质量要求,可保证本底大气CO2和CH4网络化观测数据的可溯源性和国际可比性,已应用于中心标校实验室和本底站大气CO2和CH4混合标气的标校和传递.

A new system for calibration and propagation of mixed CO2 and CH4 standards was set up based on a novel technique Cavity Ring-Down Spectroscopy（CRDS）.The system was easy to operate and consumed less standards,and with stable and reliable operation as well as excellent linear response.A simple and high efficiency calibration and propagation procedure had been established.The precision of the CO2 and CH4 of ambient concentration range was better than 0.06×10^-6 mol·mol^-1 and 0.3×10^-9 mol·mol^-1,the accuracy better than ±0.05×10^-6 mol·mol^-1 and ±0.4×10^-9 mol·mol^-1,respectively.The performance of the system can meet the requirements of the WMO-GAW′s QA/QC target on background greenhouse gases observations.The system can ensure consistency,traceability and international comparability of the observational data and has been applied in the calibration and propagation of CO2 and CH4 mixed standard gases among the central lab and stations.