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@article{Dasgupta:2026:10.5194/acp-26-8601-2026,
author = {Dasgupta, B and Pandey, S and Houweling, S and Menoud, M and van, der Veen C and Miller, J and Riddell-Young, B and Englund, Michel S and Sperlich, P and Morimoto, S and Fujita, R and Platt, S and Groot, Zwaaftink C and Levin, I and Veidt, C and Lund, Myhre C and Woolley, Maisch C and Fisher, R and G, Nisbet E and France, J and Moss, R and Warwick, N and Röckmann, T},
doi = {10.5194/acp-26-8601-2026},
journal = {Atmospheric Chemistry and Physics},
pages = {8601--8616},
title = {Global methane emission estimates from a dual-isotope inversion: new constraints from                    <i>δ</i>                    D-CH                    <sub>4</sub>},
url = {http://dx.doi.org/10.5194/acp-26-8601-2026},
volume = {26},
year = {2026}
}
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TY  - JOUR
AB  - <jats:p>                    Methane (CH                    <jats:sub>4</jats:sub>                    ) is a potent greenhouse gas; however, the causes of its growth since 2006 are a subject of debate. While measurements of CH                    <jats:sub>4</jats:sub>                    mole fraction and carbon isotopic composition (                    <jats:italic>δ</jats:italic>                    <jats:sup>13</jats:sup>                    C-CH                    <jats:sub>4</jats:sub>                    ) have been extensively used to investigate the global CH                    <jats:sub>4</jats:sub>                    budget, the hydrogen isotopic composition (                    <jats:italic>δ</jats:italic>                    D-CH                    <jats:sub>4</jats:sub>                    ) remains underutilised despite its unique sensitivity to source types and oxidation processes. Here, we assimilate a newly harmonised 35-year dataset of dual isotope measurements from high-latitude monitoring stations in both hemispheres within a two-box Bayesian inversion to quantify global CH                    <jats:sub>4</jats:sub>                    sources and sinks. The model integrates prior emissions from five source categories based on global bottom-up inventories. Methane removal processes are represented by sink-specific kinetic isotope effects as tropospheric and stratospheric loss, and soil uptake. We find that the inclusion of                    <jats:italic>δ</jats:italic>                    D-CH                    <jats:sub>4</jats:sub>                    improves the model's ability to constrain emission apportionment between biogenic and thermogenic sources, particularly for fossil fuel emissions during the late 1990s and early 2000s, which affects CH                    <jats:sub>4</jats:sub&g
AU  - Dasgupta,B
AU  - Pandey,S
AU  - Houweling,S
AU  - Menoud,M
AU  - van,der Veen C
AU  - Miller,J
AU  - Riddell-Young,B
AU  - Englund,Michel S
AU  - Sperlich,P
AU  - Morimoto,S
AU  - Fujita,R
AU  - Platt,S
AU  - Groot,Zwaaftink C
AU  - Levin,I
AU  - Veidt,C
AU  - Lund,Myhre C
AU  - Woolley,Maisch C
AU  - Fisher,R
AU  - G,Nisbet E
AU  - France,J
AU  - Moss,R
AU  - Warwick,N
AU  - Röckmann,T
DO  - 10.5194/acp-26-8601-2026
EP  - 8616
PY  - 2026///
SP  - 8601
TI  - Global methane emission estimates from a dual-isotope inversion: new constraints from                    <i>δ</i>                    D-CH                    <sub>4</sub>
T2  - Atmospheric Chemistry and Physics
UR  - http://dx.doi.org/10.5194/acp-26-8601-2026
UR  - https://doi.org/10.5194/acp-26-8601-2026
VL  - 26
ER  -
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