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Environ Sci Technol. 2015 Jul 7;49(13):8124-31. doi: 10.1021/acs.est.5b00217.

Aircraft-Based Estimate of Total Methane Emissions from the Barnett Shale Region.

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†University of Colorado, CIRES, Boulder, Colorado 80309, United States.
‡NOAA Earth System Research Laboratory, Boulder 80305, Colorado, United States.
§University of Michigan, Ann Arbor, Michigan 48109, United States.
∥Purdue University, West Lafayette, Indiana 47907, United States.
⊥University of California, Davis, Davis, California 95616, United States.
#Carbon Now Cast, LLC, State College, Pennsylvania 16803, United States.
∇Aerodyne Research, Inc., Billerica, Massachusetts 01821, United States.
○Environmental Defense Fund, Austin, Texas 78701, United States.
◆Picarro, Inc., Santa Clara, California 95054, United States.


We present estimates of regional methane (CH4) emissions from oil and natural gas operations in the Barnett Shale, Texas, using airborne atmospheric measurements. Using a mass balance approach on eight different flight days in March and October 2013, the total CH4 emissions for the region are estimated to be 76 ± 13 × 10(3) kg hr(-1) (equivalent to 0.66 ± 0.11 Tg CH4 yr(-1); 95% confidence interval (CI)). We estimate that 60 ± 11 × 10(3) kg CH4 hr(-1) (95% CI) are emitted by natural gas and oil operations, including production, processing, and distribution in the urban areas of Dallas and Fort Worth. This estimate agrees with the U.S. Environmental Protection Agency (EPA) estimate for nationwide CH4 emissions from the natural gas sector when scaled by natural gas production, but it is higher than emissions reported by the EDGAR inventory or by industry to EPA's Greenhouse Gas Reporting Program. This study is the first to show consistency between mass balance results on so many different days and in two different seasons, enabling better quantification of the related uncertainty. The Barnett is one of the largest production basins in the United States, with 8% of total U.S. natural gas production, and thus, our results represent a crucial step toward determining the greenhouse gas footprint of U.S. onshore natural gas production.

[Indexed for MEDLINE]

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