We are upgrading the repository! A content freeze is in effect until November 22nd, 2024 - no new submissions will be accepted; however, all content already published will remain publicly available. Please reach out to repository@u.library.arizona.edu with your questions, or if you are a UA affiliate who needs to make content available soon. Note that any new user accounts created after September 22, 2024 will need to be recreated by the user in November after our migration is completed.

Show simple item record

dc.contributor.authorThorpe, Andrew K
dc.contributor.authorDuren, Riley M
dc.contributor.authorConley, Stephen
dc.contributor.authorPrasad, Kuldeep R
dc.contributor.authorBue, Brian D
dc.contributor.authorYadav, Vineet
dc.contributor.authorFoster, Kelsey T
dc.contributor.authorRafiq, Talha
dc.contributor.authorHopkins, Francesca M
dc.contributor.authorSmith, Mackenzie L
dc.contributor.authorFischer, Marc L
dc.contributor.authorThompson, David R
dc.contributor.authorFrankenberg, Christian
dc.contributor.authorMcCubbin, Ian B
dc.contributor.authorEastwood, Michael L
dc.contributor.authorGreen, Robert O
dc.contributor.authorMiller, Charles E
dc.date.accessioned2020-09-04T23:32:50Z
dc.date.available2020-09-04T23:32:50Z
dc.date.issued2020-04-16
dc.identifier.citationAndrew K Thorpe et al 2020 Environ. Res. Lett. 15 045005en_US
dc.identifier.issn1748-9326
dc.identifier.doi10.1088/1748-9326/ab751d
dc.identifier.urihttp://hdl.handle.net/10150/642566
dc.description.abstractAccurate and timely detection, quantification, and attribution of methane emissions from Underground Gas Storage (UGS) facilities is essential for improving confidence in greenhouse gas inventories, enabling emission mitigation by facility operators, and supporting efforts to assess facility integrity and safety. We conducted multiple airborne surveys of the 12 active UGS facilities in California between January 2016 and November 2017 using advanced remote sensing and in situ observations of near-surface atmospheric methane (CH4). These measurements where combined with wind data to derive spatially and temporally resolved methane emission estimates for California UGS facilities and key components with spatial resolutions as small as 1-3 m and revisit intervals ranging from minutes to months. The study spanned normal operations, malfunctions, and maintenance activity from multiple facilities including the active phase of the Aliso Canyon blowout incident in 2016 and subsequent return to injection operations in summer 2017. We estimate that the net annual methane emissions from the UGS sector in California averaged between 11.0 3.8 GgCH(4) yr(-1) (remote sensing) and 12.3 3.8 GgCH(4) yr(-1) (in situ). Net annual methane emissions for the 7 facilities that reported emissions in 2016 were estimated between 9.0 3.2 GgCH(4) yr(-1) (remote sensing) and 9.5 3.2 GgCH(4) yr(-1) (in situ), in both cases around 5 times higher than reported. The majority of methane emissions from UGS facilities in this study are likely dominated by anomalous activity: higher than expected compressor loss and leaking bypass isolation valves. Significant variability was observed at different time-scales: daily compressor duty-cycles and infrequent but large emissions from compressor station blow-downs. This observed variability made comparison of remote sensing and in situ observations challenging given measurements were derived largely at different times, however, improved agreement occurred when comparing simultaneous measurements. Temporal variability in emissions remains one of the most challenging aspects of UGS emissions quantification, underscoring the need for more systematic and persistent methane monitoring.en_US
dc.language.isoenen_US
dc.publisherIOP PUBLISHING LTDen_US
dc.rightsCopyright © 2020 The Author(s). Published by IOP Publishing Ltd. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence.en_US
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subjectmethaneen_US
dc.subjectemissionsen_US
dc.subjectunderground gas storageen_US
dc.subjectAliso Canyonen_US
dc.subjecttemporal variabilityen_US
dc.subjectimaging spectrometeren_US
dc.titleMethane emissions from underground gas storage in Californiaen_US
dc.typeArticleen_US
dc.contributor.departmentUniv Arizonaen_US
dc.identifier.journalENVIRONMENTAL RESEARCH LETTERSen_US
dc.description.noteOpen access article
dc.description.collectioninformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.en_US
dc.eprint.versionFinal published versionen_US
dc.source.journaltitleEnvironmental Research Letters
dc.source.volume15
dc.source.issue4
dc.source.beginpage045005
refterms.dateFOA2020-09-04T23:32:51Z


Files in this item

Thumbnail
Name:
Thorpe_2020_Environ._Res._Lett ...
Size:
2.469Mb
Format:
PDF
Description:
Final Published Version

This item appears in the following Collection(s)

Show simple item record

Copyright © 2020 The Author(s). Published by IOP Publishing Ltd. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence.
Except where otherwise noted, this item's license is described as Copyright © 2020 The Author(s). Published by IOP Publishing Ltd. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence.