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Title: Estimating global and North American methane emissions with high spatial resolution using GOSAT satellite data
Authors: Turner, A. J.
Jacob, D. J.
Wecht, K. J.
Maasakkers, J. D.
Lundgren, E.
Andrews, A. E.
Biraud, S. C.
Boesch, Hartmut
Bowman, K. W.
Deutscher, N. M.
Dubey, M. K.
Griffith, D. W. T.
Hase, F.
Kuze, A.
Notholt, J.
Ohyama, H.
Parker, Robert
Payne, V. H.
Sussmann, R.
Sweeney, C.
Velazco, V. A.
Warneke, T.
Wennberg, P. O.
Wunch, D.
First Published: 30-Jun-2015
Publisher: Copernicus Gesellschaft Mbh
Citation: Atmospheric Chemistry And Physics, 2015, 15 (12), pp. 7049-7069 (21)
Abstract: We use 2009–2011 space-borne methane observations from the Greenhouse Gases Observing SATellite (GOSAT) to estimate global and North American methane emissions with 4° × 5° and up to 50 km × 50 km spatial resolution, respectively. GEOS-Chem and GOSAT data are first evaluated with atmospheric methane observations from surface and tower networks (NOAA/ESRL, TCCON) and aircraft (NOAA/ESRL, HIPPO), using the GEOS-Chem chemical transport model as a platform to facilitate comparison of GOSAT with in situ data. This identifies a high-latitude bias between the GOSAT data and GEOS-Chem that we correct via quadratic regression. Our global adjoint-based inversion yields a total methane source of 539 Tg a[Superscript: -1] with some important regional corrections to the EDGARv4.2 inventory used as a prior. Results serve as dynamic boundary conditions for an analytical inversion of North American methane emissions using radial basis functions to achieve high resolution of large sources and provide error characterization. We infer a US anthropogenic methane source of 40.2–42.7 Tg a[Superscript: -1], as compared to 24.9–27.0 Tg a[Superscript: -1] in the EDGAR and EPA bottom-up inventories, and 30.0–44.5 Tg a[Superscript: -1] in recent inverse studies. Our estimate is supported by independent surface and aircraft data and by previous inverse studies for California. We find that the emissions are highest in the southern–central US, the Central Valley of California, and Florida wetlands; large isolated point sources such as the US Four Corners also contribute. Using prior information on source locations, we attribute 29–44 % of US anthropogenic methane emissions to livestock, 22–31 % to oil/gas, 20 % to landfills/wastewater, and 11–15 % to coal. Wetlands contribute an additional 9.0–10.1 Tg a[Superscript: -1].
DOI Link: 10.5194/acp-15-7049-2015
ISSN: 1680-7316
eISSN: 1680-7324
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © Author(s) 2015. This work is distributed under the Creative Commons Attribution 3.0 License ( ), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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