Fig. 2.

Inversion results and empirically corrected inversion results for CO₂ and CH₄ compared to the Law Dome/modern flask atmospheric histories. (A) Dashed orange line: inversion result for CH₄ using high smoothing; dashed magenta line: inversion result for CH₄ using 10% of the smoothing used for the “high smoothing” inversion, included for comparison; and solid black line: well-established atmospheric history of CH₄ from Etheridge et al. (29) and Dlugokencky (30). (B) Dashed orange line and solid black line: as in A; solid purple line: inversion result with high smoothing with the empirical correction applied (see Bias and Uncertainty in the Inversion Technique). (C and D) As in A and B, respectively, for CO₂; the established atmospheric history is from Etheridge et al. (28) and Dlugokencky (31).