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dc.contributor.authorPühl, Magdalena
dc.contributor.authorRoiger, Anke
dc.contributor.authorFiehn, Alina
dc.contributor.authorGorchov Negron, Alan M.
dc.contributor.authorKort, Eric A.
dc.contributor.authorSchwietzke, Stefan
dc.contributor.authorPisso, Ignacio
dc.contributor.authorFoulds, Amy
dc.contributor.authorLee, James
dc.contributor.authorFrance, James L.
dc.contributor.authorJones, Anna E.
dc.contributor.authorLowry, Dave
dc.contributor.authorFisher, Rebecca E.
dc.contributor.authorHuang, Langwen
dc.contributor.authorShaw, Jacob
dc.contributor.authorBateson, Prudence
dc.contributor.authorAndrews, Stephen
dc.contributor.authorYoung, Stuart
dc.contributor.authorDominutti, Pamela
dc.contributor.authorLachlan-Cope, Tom
dc.contributor.authorWeiss, Alexandra
dc.contributor.authorAllen, Grant
dc.date.accessioned2024-04-09T08:48:30Z
dc.date.available2024-04-09T08:48:30Z
dc.date.created2024-02-27T09:48:47Z
dc.date.issued2024
dc.identifier.citationAtmospheric Chemistry and Physics (ACP). 2024, 24 (2), 1005-1024.en_US
dc.identifier.issn1680-7316
dc.identifier.urihttps://hdl.handle.net/11250/3125444
dc.description.abstractAtmospheric methane (CH4) concentrations have more than doubled since the beginning of the industrial age, making CH4 the second most important anthropogenic greenhouse gas after carbon dioxide (CO2). The oil and gas sector represents one of the major anthropogenic CH4 emitters as it is estimated to account for 22 % of global anthropogenic CH4 emissions. An airborne field campaign was conducted in April–May 2019 to study CH4 emissions from offshore gas facilities in the southern North Sea with the aim of deriving emission estimates using a top-down (measurement-led) approach. We present CH4 fluxes for six UK and five Dutch offshore platforms or platform complexes using the well-established mass balance flux method. We identify specific gas production emissions and emission processes (venting and fugitive or flaring and combustion) using observations of co-emitted ethane (C2H6) and CO2. We compare our top-down estimated fluxes with a ship-based top-down study in the Dutch sector and with bottom-up estimates from a globally gridded annual inventory, UK national annual point-source inventories, and operator-based reporting for individual Dutch facilities. In this study, we find that all the inventories, except for the operator-based facility-level reporting, underestimate measured emissions, with the largest discrepancy observed with the globally gridded inventory. Individual facility reporting, as available for Dutch sites for the specific survey date, shows better agreement with our measurement-based estimates. For all the sampled Dutch installations together, we find that our estimated flux of (122.9 ± 36.8) kg h−1 deviates by a factor of 0.64 (0.33–12) from reported values (192.8 kg h−1). Comparisons with aircraft observations in two other offshore regions (the Norwegian Sea and the Gulf of Mexico) show that measured, absolute facility-level emission rates agree with the general distribution found in other offshore basins despite different production types (oil, gas) and gas production rates, which vary by 2 orders of magnitude. Therefore, mitigation is warranted equally across geographies.en_US
dc.language.isoengen_US
dc.rightsNavngivelse 4.0 Internasjonal*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/deed.no*
dc.titleAircraft-based mass balance estimate of methane emissions from offshore gas facilities in the southern North Seaen_US
dc.title.alternativeAircraft-based mass balance estimate of methane emissions from offshore gas facilities in the southern North Seaen_US
dc.typePeer revieweden_US
dc.typeJournal articleen_US
dc.description.versionpublishedVersionen_US
dc.rights.holder© Author(s) 2024.en_US
dc.source.pagenumber1005-1024en_US
dc.source.volume24en_US
dc.source.journalAtmospheric Chemistry and Physics (ACP)en_US
dc.source.issue2en_US
dc.identifier.doi10.5194/acp-24-1005-2024
dc.identifier.cristin2250077
dc.relation.projectNILU: 121049
cristin.ispublishedtrue
cristin.fulltextoriginal
cristin.qualitycode2


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