Aircraft-Based
Measurements of Point Source Methane
Emissions in the Barnett Shale Basin
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Abstract
We report measurements
of methane (CH<sub>4</sub>) emission rates
observed at eight different high-emitting point sources in the Barnett
Shale, Texas, using aircraft-based methods performed as part of the
Barnett Coordinated Campaign. We quantified CH<sub>4</sub> emission
rates from four gas processing plants, one compressor station, and
three landfills during five flights conducted in October 2013. Results
are compared to other aircraft- and surface-based measurements of
the same facilities, and to estimates based on a national study of
gathering and processing facilities emissions and 2013 annual average
emissions reported to the U.S. EPA Greenhouse Gas Reporting Program
(GHGRP). For the eight sources, CH<sub>4</sub> emission measurements
from the aircraft-based mass balance approach were a factor of 3.2–5.8
greater than the GHGRP-based estimates. Summed emissions totaled 7022
± 2000 kg hr<sup>–1</sup>, roughly 9% of the entire basin-wide
CH<sub>4</sub> emissions estimated from regional mass balance flights
during the campaign. Emission measurements from five natural gas management
facilities were 1.2–4.6 times larger than emissions based on
the national study. Results from this study were used to represent
“super-emitters” in a newly formulated Barnett Shale
Inventory, demonstrating the importance of targeted sampling of “super-emitters”
that may be missed by random sampling of a subset of the total