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  CH4 sources estimated from atmospheric observations of CH4 and its 13C/12C isotopic ratios: 2. Inverse modeling of CH4 fluxes from geographical regions

Fletcher, S. E. M., Tans, P. P., Bruhwiler, L. M., Miller, J. B., & Heimann, M. (2004). CH4 sources estimated from atmospheric observations of CH4 and its 13C/12C isotopic ratios: 2. Inverse modeling of CH4 fluxes from geographical regions. Global Biogeochemical Cycles, 18(4), GB4005. doi:10.1029/2004GB002224.

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 Creators:
Fletcher, S. E. M., Author
Tans, P. P., Author
Bruhwiler, L. M., Author
Miller, J. B., Author
Heimann, M.1, Author           
Affiliations:
1Department Biogeochemical Systems, Prof. M. Heimann, Max Planck Institute for Biogeochemistry, Max Planck Society, ou_1497755              

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Free keywords: C-13/(12) c isotopic ratios Inverse modeling Methane sources Methane sources Carbon Cycle Antarctica Emissions Transport Oxidation Climate Adjoint Budget
 Abstract: We present a time-dependent inverse modeling approach to estimate the magnitude of CH4 emissions and the average isotopic signature of the combined source processes from geographical regions based on the observed spatiotemporal distribution of CH4 and C-13/C-12 isotopic ratios in CH4. The inverse estimates of the isotopic signature of the sources are used to partition the regional source estimates into three groups of source processes based on their isotopic signatures. Compared with bottom-up estimates, the inverse estimates call for larger CH4 fluxes in the tropics (266 ± 25 Tg CH4/yr) and southern extratropics (98 ± 15 Tg CH4/yr) and reduced fluxes in the northern extratropics (252 ± 18 Tg CH4/yr). The observations of C-13/C-12 isotopic ratios in CH4 indicate that the large a posteriori CH4 source in the tropics and Southern Hemisphere is attributable to a combination both bacterial sources and biomass burning and support relatively low estimates of fossil CH4 emissions. [References: 40]

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 Dates: 2004
 Publication Status: Issued
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 Identifiers: Other: BGC0731
DOI: 10.1029/2004GB002224
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Title: Global Biogeochemical Cycles
Source Genre: Journal
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Publ. Info: Washington, DC : American Geophysical Union
Pages: - Volume / Issue: 18 (4) Sequence Number: - Start / End Page: GB4005 Identifier: CoNE: https://pure.mpg.de/cone/journals/resource/954925553383
ISSN: 0886-6236