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. 2019 Mar 18;7(3):283–299. doi: 10.1029/2018EF001064

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©2019. The Authors.

This is an open access article under the terms of the http://creativecommons.org/licenses/by-nc-nd/4.0/ License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non‐commercial and no modifications or adaptations are made.

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Distributions of the simulated change in Δ¹⁴CH₄ versus excess CH₄ concentration, shown as two‐dimensional histograms at three selected sites. Other sites are shown in Figure S1. The top row shows WGC, middle row SBC, and bottom row SIO. Simulations shown in the left column use GEPA emissions, and the right column use EDGAR emissions. Colors show the fraction of the data contained in each bin. Blue circles show the median of the simulated change in Δ¹⁴CH₄ and the median of the excess CH₄ concentration in each case. Dashed lines show the relationship expected from constant fossil fractions of 25% and 75%, for reference.