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• W2912372441 endingPage "299" @default.
• W2912372441 startingPage "283" @default.
• W2912372441 abstract "Regional emissions of methane and their attribution to a variety of sources presently have large uncertainties. Measurements of radiocarbon (14C) in methane (CH4) may provide a method for identifying regional CH4 emissions from fossil versus biogenic sources because adding 14C-free fossil carbon reduces the 14C/C ratio (Δ14CH4) in atmospheric CH4 much more than biogenic carbon does. We describe an approach for estimating fossil and biogenic CH4 at regional scales using atmospheric Δ14CH4 observations. As a case study to demonstrate expected Δ14CH4 and Δ14CH4-CH4 relationships, we simulate and compare Δ14CH4 at a network of sites in California using two gridded CH4 emissions estimates (Emissions Database for Global Atmospheric Research, EDGAR, and Gridded Environmental Protection Agency, GEPA) and the CarbonTracker-Lagrange model for 2014, and for 2030 under business-as-usual and mitigation scenarios. The fossil fraction of CH4 (F) is closely linked with the simulated Δ14CH4-CH4 slope and differences of 2-21% in median F are found for EDGAR versus GEPA in 2014, and 7-10% for business-as-usual and mitigation scenarios in 2030. Differences of 10% in F for >200 ppb of added CH4 produce differences of >10‰ in Δ14CH4, which are likely detectable from regular observations. Nuclear power plant 14CH4 emissions generally have small simulated median influences on Δ14CH4 (0-7‰), but under certain atmospheric conditions they can be much stronger (>30‰) suggesting they must be considered in applications of Δ14CH4 in California. This study suggests that atmospheric Δ14CH4 measurements could provide powerful constraints on regional CH4 emissions, complementary to other monitoring techniques." @default.
• W2912372441 created "2019-02-21" @default.
• W2912372441 creator A5007571652 @default.
• W2912372441 creator A5042069694 @default.
• W2912372441 creator A5071474233 @default.
• W2912372441 date "2019-03-01" @default.
• W2912372441 modified "2023-10-17" @default.
• W2912372441 title "Detection of Fossil and Biogenic Methane at Regional Scales Using Atmospheric Radiocarbon" @default.
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• W2912372441 doi "https://doi.org/10.1029/2018ef001064" @default.
• W2912372441 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6559284" @default.
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• W2912372441 hasPublicationYear "2019" @default.
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