Demonstration of an ethane spectrometer for methane source identification.
Demonstration of an ethane spectrometer for methane source identification.
复制标题
用于甲烷来源识别的乙烷光谱仪演示。
DOI：
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发表时间：
2014
影响因子：
11.4
通讯作者：
C. Kolb
中科院分区：
文献类型：
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作者：
T. Yacovitch;S. Herndon;J. Roscioli;C. Floerchinger;R. McGovern;M. Agnese;G. Pétron;J. Kofler;C. Sweeney;A. Karion;S. A. Conley;E. Kort;L. Nähle;Marc Fischer;L. Hildebrandt;J. Koeth;J. McManus;D. Nelson;M. Zahniser;C. Kolb
甲烷是一种重要的温室气体和对流层臭氧前体物。同时观察乙烷和甲烷可以帮助识别特定的甲烷源类型。Aerodyne Ethane-Mini光谱仪采用最近可用的中红外分布反馈可调谐二极管激光器（DFB-TDL），可提供亚ppb精度的1 s乙烷测量。在这项工作中，乙烷迷你光谱仪已被集成到两个移动的采样平台，地面车辆和小型飞机，并用于测量乙烷/甲烷增强比顺风甲烷源。甲烷排放量与精确已知的来源显示有乙烷/甲烷增强比，根据源类型的差异很大。观察到生物源和热源之间的巨大差异。产热源内的变化进行检测和制表。甲烷排放源按其预期的乙烷含量分类。类别包括：生物天然气（<0.2%）、干气（1-6%）、湿气（>6%）、管道级天然气（<15%）和加工天然气液体（>30%）。在德克萨斯州的达拉斯/沃斯堡地区的区域尺度观测表明，两个不同的乙烷/甲烷增强比桥接的过渡区域。这些结果表明，连续和快速的乙烷测量甲烷排放的实验研究，特别是在石油和天然气部门的有用性。
Methane is an important greenhouse gas and tropospheric ozone precursor. Simultaneous observation of ethane with methane can help identify specific methane source types. Aerodyne Ethane-Mini spectrometers, employing recently available mid-infrared distributed feedback tunable diode lasers (DFB-TDL), provide 1 s ethane measurements with sub-ppb precision. In this work, an Ethane-Mini spectrometer has been integrated into two mobile sampling platforms, a ground vehicle and a small airplane, and used to measure ethane/methane enhancement ratios downwind of methane sources. Methane emissions with precisely known sources are shown to have ethane/methane enhancement ratios that differ greatly depending on the source type. Large differences between biogenic and thermogenic sources are observed. Variation within thermogenic sources are detected and tabulated. Methane emitters are classified by their expected ethane content. Categories include the following: biogenic (<0.2%), dry gas (1-6%), wet gas (>6%), pipeline grade natural gas (<15%), and processed natural gas liquids (>30%). Regional scale observations in the Dallas/Fort Worth area of Texas show two distinct ethane/methane enhancement ratios bridged by a transitional region. These results demonstrate the usefulness of continuous and fast ethane measurements in experimental studies of methane emissions, particularly in the oil and natural gas sector.