Hourly simulations of atmospheric CH₄ and its stable isotopic ratios (δ¹³C-CH₄ and δD-CH₄) using JAMSTEC's MIROC4-ACTM

The dataset presents hourly simulations (1992-2020) of atmospheric methane (CH₄) and its stable isotopic ratios (δ¹³C-CH₄ and δD-CH₄), sampled at background stations, generated using JAMSTEC’s MIROC4-based atmospheric chemistry-transport model (MIROC4-ACTM; Patra et al., SOLA, 2018). The simulations incorporate emission distributions from two key inventories—EDGARv6 and GAINSv4—to evaluate sector-specific contributions to atmospheric methane. 

The bottom-up emissions used in the simulations are publicly archived at

 https://doi.org/10.5281/zenodo.11143943 (E3_gOngWunc_Scoal_gl19.nc case)

Full details of the study are available in

Chandra, N., Patra, P.K., Fujita, R. et al. Methane emissions decreased in fossil fuel exploitation and sustainably increased in microbial source sectors during 1990–2020. Commun Earth Environ 5, 147 (2024). https://doi.org/10.1038/s43247-024-01286-x