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| Titel |
Local- and regional-scale measurements of CH4, δ13CH4, and C2H6 in the Uintah Basin using a mobile stable isotope analyzer |
| VerfasserIn |
C. W. Rella, J. Hoffnagle, Y. He, S. Tajima |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1867-1381
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 8, no. 10 ; Nr. 8, no. 10 (2015-10-30), S.4539-4559 |
| Datensatznummer |
250116653
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| Publikation (Nr.) |
 copernicus.org/amt-8-4539-2015.pdf |
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| Zusammenfassung |
| In this paper, we present an innovative CH4, δ13CH4,
and C2H6 instrument based on cavity ring-down spectroscopy (CRDS).
The design and performance of the analyzer is presented in detail. The
instrument is capable of precision of less than 1 ‰ on
δ13CH4 with 1 in. of averaging and about 0.1 ‰
in an hour. Using this instrument, we present a
comprehensive approach to atmospheric methane emissions attribution. Field
measurements were performed in the Uintah Basin (Utah, USA) in the winter
of 2013, using a mobile lab equipped with the CRDS analyzer, a high-accuracy
GPS, a sonic anemometer, and an onboard gas storage and playback system.
With a small population and almost no other sources of methane and ethane
other than oil and gas extraction activities, the Uintah Basin represents an
ideal location to investigate and validate new measurement methods of
atmospheric methane and ethane. We present the results of measurements of
the individual fugitive emissions from 23 natural gas wells and six oil wells
in the region. The δ13CH4 and C2H6 signatures
that we observe are consistent with the signatures of the gases found in the
wells. Furthermore, regional measurements of the atmospheric CH4,
δ13CH4, and C2H6 signatures throughout the basin
have been made, using continuous sampling into a 450 m long tube and
laboratory reanalysis with the CRDS instrument. These measurements suggest
that 85 ± 7 % of the total emissions in the basin are from natural
gas production. |
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