Figure 3.

Distributions of excess CH₄ concentration (left), fossil fraction (middle), and change in Δ¹⁴CH₄ (right) in simulations using the GEPA and EDGAR emissions maps. Bars show the median and interquartile range (middle 50% of the data, between the 25th and 75th quantiles) for each variable at each observation site simulated in the afternoon for 2014 using CarbonTracker‐Lagrange. In the right panel, the change in Δ¹⁴CH₄ is also shown for a simulation in which the excess CH₄ concentration is determined using EDGAR but the fossil fraction is determined using GEPA.