Gridded posterior methane emissions

The publication Estimating Emissions of Methane Consistent with Atmospheric Measurements of Methane and δ¹³C of Methane reports methane emissions inferred from a joint assimilation of atmospheric CH₄ and δ¹³CH₄ measurements. The inversion problem is under-constrained, and therefore inversely estimated fluxes should not be interpreted at the spatiotemporal resolution of the inversion. However, for visualization and modeling purposes, it is often convenient to have gridded flux estimates that, while not direct outputs from the inversion, satisfy multiple regional constraints from the inversion. This 1º×1º flux product is such a construction. At annual, continental scales, the total methane emissions per source type are identical to those from the CH₄ + δ¹³CH₄ inversion in the publication. The monthly, sub-continental patterns are dictated by the prior (inventory) emission estimates used in the publication.