Drivers of atmospheric methane

Stable carbon and hydrogen isotopes in methane from four Antarctic ice cores indicate that tropical wetlands and seasonally inundated floodplains likely drove atmospheric methane variability through the current and past interglacial periods along with their preceding glacial maxima, that geologic methane emissions may play a steady but minor role in atmospheric methane variability, and that shifts in carbon and hydrogen methane isotopic ratios during the last 25,000 years may be the result of increased fire activity.

Article #16-13883: “Glacial/interglacial wetland, biomass burning, and geologic methane emissions constrained by dual stable isotopic CH4 ice core records,” by Michael Bock et al.