Reduced atmospheric oxidation explains the methane surge in 2020 (IMAGE)
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Implications of OH reduction for the methane surge in 2020. Impact of OH reduction on global (a) and hemispheric (b and c) methane growth anomalies in 2020, and anomalies observed from the GOSAT satellite instrument (green lines) are compared with those simulated by the GEOS-Chem CH4-only model driven by reduced OH in the globe (grey), the Northern Hemisphere (blue), and the Southern Hemisphere (orange), respectively. Derivation of growth anomalies is illustrated in Fig. S8. (d) The changes in the global methane budget between 2018-2019 and 2020 are decomposed into contributions of changing emissions (ΔE), OH (-Δkm), and methane burdens (-kΔm). ΔE and -Δkm are considered as forcing terms while -kΔm represents relaxation to the steady state. See Supplementary Text 7 for detailed discussion on the decomposition.
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