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

作　　者：臧昆鹏[1] 周凌晞[1] 方双喜[1] 温玉璞[1] 姚波[1] 张芳[1] 刘立新[1] 

机构地区：[1]中国气象科学研究院,中国气象局大气成分观测与服务中心,中国气象局大气化学重点开放实验室,北京100081

出　　处：《环境化学》2011年第2期511-516,共6页Environmental Chemistry

基　　金：国家自然科学基金(40775078);公益性行业科研专项(GYHY200806026);国际科技合作重点项目(2007DFA20650)资助

摘　　要：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.

关 键 词：CO2 CH4 混合标气 标校和传递 大气本底观测 

分 类 号：X16[环境科学与工程—环境科学]