Improved Constraints on Global Methane Emissions and Sinks Using <i>δ</i> ¹³C-CH₄.

(6) Renewed growth of atmospheric CH 4 after 2006 is due to a negative trend in atmospheric [OH] (Rigby et al., 2017 ; Turner et al., 2017 ), represented by scenario: J_[OH]− : Total emissions are kept the same as scenario C_WL+ before 2006, after which they are kept constant at the mean level for 2002–2006; [OH] in our model is adjusted uniformly to match observed atmospheric increases in CH 4 (i.e., increase in atmospheric CH 4 is assumed to be solely from changes in [OH]; see Equation 1 for the relationship among emissions, sinks, and global CH 4 growth).

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The model scenario with a significant negative trend (−8%) in [OH] yields a positive trend in global mean δ 13 C‐CH 4 (scenario J_[OH]−), contradicting the observed decrease.

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