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

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

doi:10.5194/essd-18-4793-2026

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

Supplement

https://doi.org/10.5194/essd-18-4793-2026-supplement

Data sets

Global δ13C(CH4) Source Signatures Emeline Tapin et al. https://doi.org/10.57780/ESA-6D202E9

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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.