Measurements of carbon-14 of methane in Greenland ice: investigating methane sources during the Last Glacial Termination

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dc.contributor.authorPetrenko, VVen_AU
dc.contributor.authorSmith, AMen_AU
dc.contributor.authorSeveringhaus, JPen_AU
dc.contributor.authorBrook, EJen_AU
dc.contributor.authorLowe, DCen_AU
dc.contributor.authorRiedel, Ken_AU
dc.contributor.authorBrailsford, Gen_AU
dc.contributor.authorHua, Qen_AU
dc.contributor.authorReeh, Nen_AU
dc.contributor.authorSchaefer, Hen_AU
dc.contributor.authorWeiss, RFen_AU
dc.contributor.authorEtheridge, DMen_AU
dc.date.accessioned2021-07-27T02:49:51Zen_AU
dc.date.available2021-07-27T02:49:51Zen_AU
dc.date.issued2008-12-15en_AU
dc.date.statistics2021-07-22en_AU
dc.description.abstractWe present the first measurements of 14C of methane (14CH4) in ancient glacial ice. 14CH4 should distinguish unambiguously between wetland and fossil (clathrate or other geologic CH4) contributions to abrupt atmospheric CH4 increases observed at times of rapid warming in Greenland ice cores. 1000-kg-sized ice samples, dating to the Younger Dryas - Preboreal (around 11,600 yr BP) and Oldest Dryas - Bølling (around 14,700 yr BP) abrupt climatic transitions, were obtained from an ablation site in West Greenland. Measured 14CH4 values (28 - 35 pMC) were higher than predicted under any scenario based on sample age. Sample 14CH4 appears to be elevated by in- situ CH4 production in the ice for some samples as well as by a second process that is likely direct cosmogenic production of 14CH4 molecules in the ice. 14C of CO and CO2 was measured to better understand these processes and corrections were applied to sample 14CH4. Although the corrected results have substantial uncertainties, they suggest that wetland sources were responsible for the majority of the Younger Dryas - Preboreal CH4 rise. The uncertainties in the corrected results for the Oldest Dryas - Bølling transition are too large to draw conclusions about 14CH4 changes during that transition. © 2008 American Geophysical Unionen_AU
dc.identifier.booktitleEos Transactions, AGUen_AU
dc.identifier.citationPetrenko, V. V., Smith, A. M., Severinghaus, J. P., Brook, E. J., Lowe, D., Riedel, K., Brailsford, G., Hua, Q., Reeh, N., Schaefer, H., Weiss, R. F. & Etheridge, D. M. (2008). Measurements of carbon-14 of methane in Greenland ice: investigating methane sources during the Last Glacial Termination. Paper presented at the AGU Fall Meeting 2008, San Francisco, California, 15 to 19 December 2008. In Eos Transactions, AGU, 89(53), Fall Meeting Supplement, U34A-05. Retrieved from: https://abstractsearch.agu.org/meetings/2008/FM/U34A-05.htmlen_AU
dc.identifier.conferenceenddate19 December 2008en_AU
dc.identifier.conferencenameAGU Fall Meeting 2008en_AU
dc.identifier.conferenceplaceSan Francisco, Californiaen_AU
dc.identifier.conferencestartdate15 December 2008en_AU
dc.identifier.issue53en_AU
dc.identifier.otherU34A-05.en_AU
dc.identifier.paginationFall Meeting Supplementen_AU
dc.identifier.urihttps://abstractsearch.agu.org/meetings/2008/FM/U34A-05.htmlen_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/11099en_AU
dc.identifier.volume89en_AU
dc.language.isoenen_AU
dc.publisherAmerican Geophysical Union (AGU)en_AU
dc.subjectCarbon 14en_AU
dc.subjectMethaneen_AU
dc.subjectGreenhouse gasesen_AU
dc.subjectIsotopesen_AU
dc.subjectIceen_AU
dc.subjectDrill coresen_AU
dc.subjectGlaciersen_AU
dc.subjectGreenlanden_AU
dc.subjectArctic regionsen_AU
dc.titleMeasurements of carbon-14 of methane in Greenland ice: investigating methane sources during the Last Glacial Terminationen_AU
dc.typeConference Abstracten_AU
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