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| Titel |
Estimating global and North American methane emissions with high spatial resolution using GOSAT satellite data |
| VerfasserIn |
A. J. Turner, D. J. Jacob, K. J. Wecht, J. D. Maasakkers, E. Lundgren, A. E. Andrews, S. C. Biraud, H. Boesch, K. W. Bowman, N. M. Deutscher, M. K. Dubey, D. W. T. Griffith, F. Hase, A. Kuze, J. Notholt, H. Ohyama, R. Parker, V. H. Payne, R. Sussmann, C. Sweeney, V. A. Velazco, T. Warneke, P. O. Wennberg, D. Wunch |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 15, no. 12 ; Nr. 15, no. 12 (2015-06-30), S.7049-7069 |
| Datensatznummer |
250119859
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| Publikation (Nr.) |
 copernicus.org/acp-15-7049-2015.pdf |
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| Zusammenfassung |
| 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−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−1, as compared to
24.9–27.0 Tg a−1 in the EDGAR and EPA bottom-up inventories, and
30.0–44.5 Tg a−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−1. |
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