CH4 sources estimated from atmospheric observations of CH4 and its 13C/12C 
isotopic ratios: 1. Inverse modeling of source processes

Fletcher, S. E. M.; Tans, P. P.; Bruhwiler, L. M.; Miller, J. B.; Heimann, Martin

doi:10.1029/2004GB002223

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CH₄ sources estimated from atmospheric observations of CH₄ and its ¹³C/¹²C isotopic ratios: 1. Inverse modeling of source processes

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Heimann, Martin
Department Biogeochemical Systems, Prof. M. Heimann, Max Planck Institute for Biogeochemistry, Max Planck Society;

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http://dx.doi.org/10.1029/2004GB002223
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Citation

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: 1. Inverse modeling of source processes. Global Biogeochemical Cycles, 18(4): GB4004. doi:10.1029/2004GB002223.

Cite as: https://hdl.handle.net/11858/00-001M-0000-000E-D180-3

Abstract

A time-dependent inverse modeling approach that estimates the global magnitude of atmospheric methane sources from the observed spatiotemporal distribution of atmospheric CH₄, C-13/C-12 isotopic ratios, and a priori estimates of the source strengths is presented. Relative to the a priori source estimates, the inverse model calls for increased CH₄ flux from sources with strong spatial footprints in the tropics and Southern Hemisphere and decreases in sources in the Northern Hemisphere. The CH₄ and C-13/C-12 isotopic ratio observations suggest an unusually high CH₄ flux from swamps (similar tO₂00 ± 44 Tg CH₄/yr) and biomass burning (88 ± 18 Tg CH₄/yr) with relatively low estimates of emissions from bogs (similar tO₂0 ± 14 Tg CH₄/yr), and landfills (35 ± 14 Tg CH₄/yr). The model results support the hypothesis that the 1998 CH₄ growth rate anomaly was caused in part by a large increase in CH₄ production from wetlands, and indicate that wetland sources were about 40 Tg CH₄/yr higher in 1998 than 1999. [References: 71]