A gridded inventory of annual 2012-2018 U.S. anthropogenic methane emissions

This is a Preprint and has not been peer reviewed. The published version of this Preprint is available: https://doi.org/10.1021/acs.est.3c05138. This is version 1 of this Preprint.

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Joannes D. Maasakkers, Erin E McDuffie, Melissa P Sulprizio, Candice Chen, Maggie Schultz, Lily Brunelle, Ryan Thrush, John Steller, Christopher Sherry, Daniel J. Jacob, Seongeun Jeong, Bill Irving, Melissa Weitz


Nationally reported greenhouse gas inventories are a core component of the Paris Agreement transparency framework. Comparisons with emission estimates derived from atmospheric observations help identify improvements to reduce uncertainties and increase confidence in reported values. To facilitate comparisons over the contiguous United States, we present a 0.1°×0.1° gridded inventory of annual 2012-2018 anthropogenic methane emissions, allocated to 26 individual source categories, with scale-dependent error estimates. Our inventory is consistent with the U.S. Environmental Protection Agency (EPA) Inventory of U.S. Greenhouse Gas Emissions and Sinks (GHGI), submitted to the United Nations in 2020. Total emissions and patterns (spatial/temporal) reflect the activity and emission factor data underlying the GHGI, including many updates relative to a previous gridded GHGI that has been extensively compared with observations. These underlying data are not generally available in global gridded inventories, and comparison to EDGAR v6 shows large spatial differences, particularly for the oil and gas sectors. We also find strong regional variability across all sources in annual 2012-2018 spatial trends, highlighting the importance of understanding regional and facility-level activities. Our inventory represents the first time series of gridded GHGI methane emissions and enables robust comparisons of emissions and their trends with atmospheric observations.




Atmospheric Sciences


greenhouse gas, UNFCCC, agriculture, Petroleum, Natural gas, coal, waste


Published: 2023-06-30 07:12

Last Updated: 2023-06-30 14:12


CC BY Attribution 4.0 International

Additional Metadata

Data Availability (Reason not available):
Gridded 2012-2018 GHGI Dataset: All emissions data are available as netCDF files at: https://zenodo.org/record/7672124. Emissions are consistent with emissions from the 1990-2018 U.S. EPA Inventory of U.S. Greenhouse Gas Emissions and Sinks. This dataset includes annual emission fluxes for 26 source categories and monthly emission scale factors for sources with strong temporal variability. Gridded 2012-2020 Express Extension Dataset: All emissions data are available as netCDF files at: https://zenodo.org/record/7672124. Total emissions are scaled to be consistent with the 1990-2020 U.S. EPA Inventory of U.S. Greenhouse Gas Emissions and Sinks and use the same spatial proxies as the 2012-2018 Gridded GHGI Dataset. Monthly emission scale factors are not estimated.