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Region Type Averaging
Gridded Emissions.(Left) Estimated CH4 emissions at 3°x2° degree spatial resolution for the selected source category, region and period. Units are TgCH4/yr. (Right) Fractional difference from prior emission estimates, defined as the difference between the posterior and prior estimates divided by the prior estimate for each grid cell.

RegionPrior Fossil Fuel EmissionPosterior Fossil Fuel EmissionPrior Microbial EmissionPosterior Microbial EmissionPrior Pyrogenic EmissionPosterior Pyrogenic EmissionPrior Total EmissionPosterior Total Emission
North America20.63 ± 5.0631.32 ± 4.3151.3 ± 2.1951.9 ± 3.641.94 ± 0.91.7 ± 0.3373.86 ± 5.5984.92 ± 3.56
North American Boreal1.72 ± 3.92.59 ± 0.6117.49 ± 1.7315.62 ± 1.31.17 ± 0.740.94 ± 0.3120.38 ± 4.3319.15 ± 1.3
North American Temperate19.39 ± 2.7429.44 ± 4.2234.9 ± 1.2137.21 ± 3.590.81 ± 0.510.8 ± 0.0955.11 ± 3.0467.45 ± 3.61
Tabulated Results. Regional total Emissions in TgCH4/yr for the selected region and period. "Prior" and "Posterior" refer to estimated emissions before and after assimilation of atmospheric observations. The estimated uncertainties are 1-σ confidence intervals. The columns labeled "Prior Total" and "Posterior Total" show the sums of the individual source categories.