Global δ13C(CH4) Source Signatures

This dataset provides monthly gridded δ13C(CH₄) isotopic signatures (‰ vs V-PDB) for five methane emission sectors: Agricultural Waste (AGW), Fossil Fuel Geological (FFG), Biomasswetland (NAT), and Wetlands (WET), and their subsequent sub-sectors, at 1°×1° spatial resolution for the period 1998–2022. Each sector file contains monthly flux-weighted δ13C(CH₄)prior CH₄ emissions used in the Global Methane Budget inversion protocol (Martinez et al., 2024), EDGARv8 (Crippa et al., 2023), and GFED4s (van Wees et al., 2022). Sub-sector δ13C-Cfrom recent literature (Lan et al., 2021; Menoud et al., 2022; Oh et al., 2022; Thompson et al., 2018; Etiope et al., 2019; Sansone et al., 2001). The dataset also includes uncertainty comaggregation (σagg), and total (σtotal), expressed in ‰ vs V-PDB. Data are suitable for use in atmospheric inversion and isotope modeling frameworks.