†Aerodyne Research Inc., Billerica, Massachusetts 01821, United States.
‡Cooperative Institute for Research in Environmental Sciences, University of Colorado Boulder, Boulder, Colorado 80309, United States.
Environ Sci Technol. 2015 Jul 7;49(13):7889-95. doi: 10.1021/es506352j. Epub 2015 Mar 9.
Results of mobile ground-based atmospheric measurements conducted during the Barnett Shale Coordinated Campaign in spring and fall of 2013 are presented. Methane and ethane are continuously measured downwind of facilities such as natural gas processing plants, compressor stations, and production well pads. Gaussian dispersion simulations of these methane plumes, using an iterative forward plume dispersion algorithm, are used to estimate both the source location and the emission magnitude. The distribution of emitters is peaked in the 0-5 kg/h range, with a significant tail. The ethane/methane molar enhancement ratio for this same distribution is investigated, showing a peak at ∼1.5% and a broad distribution between ∼4% and ∼17%. The regional distributions of source emissions and ethane/methane enhancement ratios are examined: the largest methane emissions appear between Fort Worth and Dallas, while the highest ethane/methane enhancement ratios occur for plumes observed in the northwestern potion of the region. Individual facilities, focusing on large emitters, are further analyzed by constraining the source location.
介绍了 2013 年春季和秋季在 Barnett Shale 协调活动期间进行的移动地面大气测量的结果。在天然气加工厂、压缩机站和生产井场等设施下风处连续测量甲烷和乙烷。使用迭代前向羽流扩散算法对这些甲烷羽流进行高斯扩散模拟，以估计源位置和排放强度。排放源的分布在 0-5kg/h 范围内呈峰值分布，并有一个显著的长尾。对同一分布的乙烷/甲烷摩尔增强比进行了研究，结果表明在约 1.5%处出现峰值，在约 4%至约 17%之间有一个较宽的分布。还检查了源排放和乙烷/甲烷增强比的区域分布：最大的甲烷排放量出现在沃思堡和达拉斯之间，而在该区域西北部观察到的羽流中，乙烷/甲烷增强比最高。通过限制源位置，进一步对个别设施（重点是大型排放源）进行了分析。
