Earth System Science Data
Earth System Science Data
Earth System Science Data
Articles | Volume 18, issue 7
Articles | Volume 18, issue 7
https://doi.org/10.5194/essd-18-4793-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/essd-18-4793-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 18, issue 7
Data description article
 | 
10 Jul 2026
Data description article |  | 10 Jul 2026

A global dataset of δ13C-CH4 source signatures and associated uncertainties (1998–2022), with a sensitivity analysis to support isotopic inversions

Emeline Tapin, Antoine Berchet, Adrien Martinez, Malika Menoud, Joël Thanwerdas, Xin Lan, Edward Malina, Daniele Gasbarra, and Marielle Saunois

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Latest update: 10 Jul 2026
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Short summary
We present global δ¹³C-CH₄ source signature maps (1998–2022) at 1°×1° resolution for five emission sectors and 11 sub-sectors, with quantified uncertainties. Sensitivity experiments with an atmospheric transport model assess how uncertainties in emissions, isotopic signatures, OH sinks, and kinetic isotope effects influence atmospheric δ¹³C-CH₄ and CH₄, providing guidance for isotopic inversions.
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