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New insights into past methane cycle changes from ice cores

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If you have a question about this talk, please contact Dr. Ailsa Benton.

All welcome. If external to BAS, please email the organiser in advance to gain access to the building.

Latest analytical progress in methane ice core studies in terms of temporal resolution but also in terms of the methane isotopic composition provides new insights into past changes in the global methane cycle. The use of bipolar (isotopic) methane records allows us to determine the emissions of different methane source for times of relatively stable environmental conditions such as the Holocene. For glacial/interglacial changes, however, we found that not only wetland emission strengths are changing but also the isotopic signatures of the methane sources themselves are altered considerably. While this change in source signature allows us to make inferences about previously underestimated ecosystem changes in the past, it leaves the methane budget on such long time scale still underconstrained.

This talk is part of the BAS Chemistry & Past Climate Seminars series.

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