CRDS和GC方法在线监测大气CH_(4)和CO的结果对比  

Comparison of Online Monitoring Results of Atmospheric CH_(4)and CO Using CRDS and GC Methods

作　　者：吴栋桥 王凯[2] 孙万启 秦正新 潘京京 王红阳[1] WU Dongqiao;WANG Kai;SUN Wanqi;QIN Zhengxin;PAN Jingjing;WANG Hongyang(Meteorological Observation Centre,China Meteorological Administration,Beijing 100081,China;Wuhan Regional Climate Center,Wuhan 430027,China)

机构地区：[1]中国气象局气象探测中心,北京100081 [2]武汉区域气候中心,湖北武汉430027

出　　处：《中国环境监测》2024年第5期179-186,共8页Environmental Monitoring in China

基　　金：国家重点研发计划项目(2019YFC0214503);湖北省气象局科研项目(2022Y08)。

摘　　要：光腔衰荡光谱法(CRDS)和色谱法(GC)均可用于甲烷(CH_(4))和一氧化碳(CO)的在线观测。金沙大气本底站建立了基于CRDS和GC的平行观测系统,对大气中的CH_(4)和CO进行了长达一年半的在线观测试验,对二者获取的数据进行了对比分析。结果表明:CRDS对CH_(4)和CO观测的长期稳定性和准确性明显优于GC;CRDS和GC获取CH_(4)的系统偏差满足世界气象组织全球大气观测计划(WMO/GAW)的兼容性指标要求,获取CO的系统偏差不满足兼容性指标要求;CRDS和GC获取CH_(4)的日变化曲线基本重合,均呈现双峰形态,获取CO的日变化曲线也基本重合,但变化特征均不明显;CRDS和GC获取CH_(4)的季节变化曲线基本重合,7—8月最低,与北半球变化趋势吻合,获取的CO季节变化曲线趋势上基本一致,在夏季7月出现谷值。The cavity ring-down spectroscopy(CRDS)and gas chromatography(GC)can both be used for the online observation of methane(CH_(4))and carbon monoxide(CO).A parallel observation system based on CRDS and GC was established in Jinsha atmospheric background station,and the online observation experiment of CH_(4)and CO in the atmosphere was carried out for one and a half years,and the data obtained from both methods were compared and analyzed.The results showed that the long-term stability and accuracy of CH_(4)and CO observations with CRDS were significantly better than GC;the systematic biases of CH_(4)obtained by CRDS and GC could meet the compatibility requirements of the World Meteorological Organization Global Atmosphere Watch(WMO/GAW),while the systematic bias of CO obtained could not meet the compatibility requirements;the daily variation curves of CH_(4)obtained by CRDS and GC were basically coincident,showing a bimodal pattern,while the daily variation curves of CO also largely overlap but with less distinct characteristics;the seasonal variation curves of CH_(4)obtained by CRDS and GC were basically the same,with the lowest levels in July-August,matching the trend in the Northern Hemisphere,and the seasonal variation curves of CO showed a similar trend,with a valley occurring in July during summer.

关 键 词：光腔衰荡光谱法 气相色谱法 甲烷 一氧化碳 在线监测 

分 类 号：X83[环境科学与工程—环境工程]