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• W2000460508 abstract "During the last glacial cycle, greenhouse gas concentrations fluctuated on decadal and longer timescales. Concentrations of methane, as measured in polar ice cores, show a close connection with Northern Hemisphere temperature variability, but the contribution of the various methane sources and sinks to changes in concentration is still a matter of debate. Here we assess changes in methane cycling over the past 160,000 years by measurements of the carbon isotopic composition δ13C of methane in Antarctic ice cores from Dronning Maud Land and Vostok. We find that variations in the δ13C of methane are not generally correlated with changes in atmospheric methane concentration, but instead more closely correlated to atmospheric CO2 concentrations. We interpret this to reflect a climatic and CO2-related control on the isotopic signature of methane source material, such as ecosystem shifts in the seasonally inundated tropical wetlands that produce methane. In contrast, relatively stable δ13C values occurred during intervals of large changes in the atmospheric loading of methane. We suggest that most methane sources—most notably tropical wetlands—must have responded simultaneously to climate changes across these periods. Atmospheric methane concentrations varied substantially over the last glacial cycle. An analysis of the δ13C of the methane suggests that the relative strength of various methane sources and sinks varied independently of overall changes in methane concentrations." @default.
• W2000460508 created "2016-06-24" @default.
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• W2000460508 date "2013-08-25" @default.
• W2000460508 modified "2023-09-24" @default.
• W2000460508 title "Independent variations of CH4 emissions and isotopic composition over the past 160,000 years" @default.
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• W2000460508 doi "https://doi.org/10.1038/ngeo1922" @default.
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