Source Signature of Volatile Organic Compounds from Oil and Natural Gas Operations in Northeastern Colorado
Source Signature of Volatile Organic Compounds from Oil and Natural Gas Operations in Northeastern Colorado
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DOI：
10.1021/es304119a
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发表时间：
2013-02-05
影响因子：
11.4
通讯作者：
de Gouw, J. A.
中科院分区：
文献类型：
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作者：
Gilman, J. B.;Lerner, B. M.;de Gouw, J. A.
2011年冬季，在博尔德大气观测站（BAO）测量了大量挥发性有机化合物（VOCs），以研究科罗拉多州东北部石油和天然气（O&NG）作业中挥发性有机化合物（VOC）排放的组成和影响。BAO位于丹佛以北30公里处，位于Wattenberg油田的西南部，Wattenberg油田是科罗拉多州产量最高的石油和天然气油田之一。我们将BAO的VOC浓度与美国其他城市的VOC浓度、科罗拉多州东北部另外两个地点的夏季测量值以及Wattenberg气田的原料天然气成分进行了比较。这些比较表明：(1)与油气生产相关的VOC源特征可以与以车辆尾气为主的城市源明显区分开来；(2)在科罗拉多州东北部的三个测点，油气生产排放的VOCs都很明显。在BAO下，VOCs与羟基自由基（OH）的反应活性主要是C-2-C-6烷烃，因为它们的丰度非常高（例如，平均丙烷= 27.2 ppbv）。通过统计回归分析，我们估计平均55 +/- 18%的VOC-OH反应性可归因于石油天然气生产的排放，这表明这些排放是臭氧前体的重要来源。
An extensive set of volatile organic compounds (VOCs) was measured at the Boulder Atmospheric Observatory (BAO) in winter 2011 in order to investigate the composition and influence of VOC emissions from oil and natural gas (O&NG) operations in northeastern Colorado. BAO is 30 km north of Denver and is in the southwestern section of Wattenberg Field, one of Colorado's most productive O&NG fields. We compare VOC concentrations at BAO to those of other U.S. cities and summertime measurements at two additional sites in northeastern Colorado, as well as the composition of raw natural gas from Wattenberg Field. These comparisons show that (i) the VOC source signature associated with O&NG operations can be clearly differentiated from urban sources dominated by vehicular exhaust, and (ii) VOCs emitted from O&NG operations are evident at all three measurement sites in northeastern Colorado. At BAO, the reactivity of VOCs with the hydroxyl radical (OH) was dominated by C-2-C-6 alkanes due to their remarkably large abundances (e.g., mean propane = 27.2 ppbv). Through statistical regression analysis, we estimate that on average 55 +/- 18% of the VOC-OH reactivity was attributable to emissions from O&NG operations indicating that these emissions are a significant source of ozone precursors.