title: Gridded National Inventory of U.S. Methane Emissions.
abstract: We present a gridded inventory of US anthropogenic methane emissions with 0.1° × 0.1° spatial resolution, monthly temporal resolution, and detailed scale-dependent error characterization. The inventory is designed to be consistent with the 2016 US Environmental Protection Agency (EPA) Inventory of US Greenhouse Gas Emissions and Sinks (GHGI) for 2012. The EPA inventory is available only as national totals for different source types. We use a wide range of databases at the state, county, local, and point source level to disaggregate the inventory and allocate the spatial and temporal distribution of emissions for individual source types. Results show large differences with the EDGAR v4.2 global gridded inventory commonly used as a priori estimate in inversions of atmospheric methane observations. We derive grid-dependent error statistics for individual source types from comparison with the Environmental Defense Fund (EDF) regional inventory for Northeast Texas. These error statistics are independently verified by comparison with the California Greenhouse Gas Emissions Measurement (CALGEM) grid-resolved emission inventory. Our gridded, time-resolved inventory provides an improved basis for inversion of atmospheric methane observations to estimate US methane emissions and interpret the results in terms of the underlying processes.
authors.affiliation: School of Engineering and Applied Sciences, Harvard University , Pierce Hall, 29 Oxford Street, Cambridge, Massachusetts 02138, United States.
authors.forename: Joannes D
authors.initials: JD
authors.lastname: Maasakkers
authors.affiliation: School of Engineering and Applied Sciences, Harvard University , Pierce Hall, 29 Oxford Street, Cambridge, Massachusetts 02138, United States.
authors.forename: Daniel J
authors.initials: DJ
authors.lastname: Jacob
authors.affiliation: School of Engineering and Applied Sciences, Harvard University , Pierce Hall, 29 Oxford Street, Cambridge, Massachusetts 02138, United States.
authors.forename: Melissa P
authors.initials: MP
authors.lastname: Sulprizio
authors.affiliation: School of Engineering and Applied Sciences, Harvard University , Pierce Hall, 29 Oxford Street, Cambridge, Massachusetts 02138, United States.
authors.forename: Alexander J
authors.initials: AJ
authors.lastname: Turner
authors.affiliation: Climate Change Division, Environmental Protection Agency , Washington, District of Columbia 20460, United States.
authors.forename: Melissa
authors.initials: M
authors.lastname: Weitz
authors.affiliation: Climate Change Division, Environmental Protection Agency , Washington, District of Columbia 20460, United States.
authors.forename: Tom
authors.initials: T
authors.lastname: Wirth
authors.affiliation: Climate Change Division, Environmental Protection Agency , Washington, District of Columbia 20460, United States.
authors.forename: Cate
authors.initials: C
authors.lastname: Hight
authors.affiliation: Climate Change Division, Environmental Protection Agency , Washington, District of Columbia 20460, United States.
authors.forename: Mark
authors.initials: M
authors.lastname: DeFigueiredo
authors.affiliation: Climate Change Division, Environmental Protection Agency , Washington, District of Columbia 20460, United States.
authors.forename: Mausami
authors.initials: M
authors.lastname: Desai
authors.affiliation: Climate Change Division, Environmental Protection Agency , Washington, District of Columbia 20460, United States.
authors.forename: Rachel
authors.initials: R
authors.lastname: Schmeltz
authors.affiliation: Climate Change Division, Environmental Protection Agency , Washington, District of Columbia 20460, United States.
authors.forename: Leif
authors.initials: L
authors.lastname: Hockstad
authors.affiliation: Jet Propulsion Laboratory, California Institute of Technology , Pasadena, California 91109, United States.
authors.forename: Anthony A
authors.initials: AA
authors.lastname: Bloom
authors.affiliation: Jet Propulsion Laboratory, California Institute of Technology , Pasadena, California 91109, United States.
authors.forename: Kevin W
authors.initials: KW
authors.lastname: Bowman
authors.affiliation: Energy Technologies Area, Lawrence Berkeley National Laboratory , Berkeley, California 94720, United States.
authors.forename: Seongeun
authors.initials: S
authors.lastname: Jeong
authors.affiliation: Energy Technologies Area, Lawrence Berkeley National Laboratory , Berkeley, California 94720, United States.
authors.forename: Marc L
authors.initials: ML
authors.lastname: Fischer
mesh_terms: D000393:Air Pollutants; D004784:Environmental Monitoring; D008697:Methane; D013781:Texas; D014481:United States; D014484:United States Environmental Protection Agency
chemical_list: D000393:Air Pollutants; D008697:Methane