Radioactive and stable paleoatmospheric methane isotopes across the last deglaciation and early holocene from Taylor Glacier, Antarctica

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dc.contributor.authorDyonisius, MNen_AU
dc.contributor.authorPetrenko, VVen_AU
dc.contributor.authorSmith, AWen_AU
dc.contributor.authorHmiel, Ben_AU
dc.contributor.authorVimont, Ien_AU
dc.contributor.authorHua, Qen_AU
dc.contributor.authorYang, Ben_AU
dc.contributor.authorMenking, JAen_AU
dc.contributor.authorShackleton, SAen_AU
dc.contributor.authorRhodes, RHen_AU
dc.contributor.authorBaggenstos, Den_AU
dc.contributor.authorBauska, TKen_AU
dc.contributor.authorBock, Men_AU
dc.contributor.authorBeck, Jen_AU
dc.contributor.authorSeth, Ben_AU
dc.contributor.authorHarth, CMen_AU
dc.contributor.authorBeaudette, Ren_AU
dc.contributor.authorSchmitt, Jen_AU
dc.contributor.authorBrook, EJen_AU
dc.contributor.authorWeiss, RFen_AU
dc.contributor.authorFischer, Hen_AU
dc.contributor.authorSeveringhaus, JPen_AU
dc.contributor.authorMcConnel, JPen_AU
dc.date.accessioned2020-02-13T04:49:09Zen_AU
dc.date.available2020-02-13T04:49:09Zen_AU
dc.date.issued2016-12-13en_AU
dc.date.statistics2020-02-13en_AU
dc.descriptionTuesday, 13 December 2016 08:00 - 12:20 Moscone South - Poster Hall PP21A Abrupt Climate Change: Causes, Mechanisms, and Consequences IV Postersen_AU
dc.description.abstractMethane (CH4) is an important greenhouse gas with both natural and anthropogenic sources. Understanding how the natural CH4 budget has changed in response to changing climate in the past can provide insights on the sensitivity of the natural CH4 emissions to the current anthropogenic warming. Both radioactive and stable CH4 isotopes (Delta14C-CH4, delta13C-CH4, and deltaD-CH4) from ice cores in Greenland and Antarctica have been used to constrain the past CH­4 budget. Among the CH4 isotopes, 14CH4 is unique in its ability to unambiguously distinguish between "old" CH4 sources (e.g. marine clathrate, geologic sources, old permafrost) and "modern" CH4 sources (e.g. tropical and boreal wetlands). During the 2013-2014 and 2014-2015 field seasons at Taylor Glacier, Antarctica, we have successfully extracted 12 large volume ice samples across the Last Deglaciation to early Holocene (20ka-8ka BP). All samples have been successfully measured for CH4 mole fraction ([CH4]), Delta14C-14CH4, delta13C-CH4, and deltaD-CH4. The [CH4], delta13C-CH4, and deltaD-CH4 measurements in our samples are consistent with existing delta13C-CH4, and deltaD-CH4 datasets from other deep cores, confirming the integrity of CH4 in Taylor Glacier ice. Preliminary 14CH4 results across the Oldest Dryas - Bølling (OD-BO) CH4 transition suggest that the 150 ppb [CH4] increase during the transition was caused by increased wetland emissions. Early Holocene and Last Glacial Maximum (LGM) 14C results are still undergoing corrections for in-situ cosmogenic 14C based on 14CO measurements in the same samples. We will present the corrected 14CH4 results from these samples and our preliminary interpretations with regard to the strength of old CH4 sources during the LGM and early Holocene. © 2016 American Geophysical Unionen_AU
dc.identifier.citationDyonisius, M., Petrenko, V. V., Smith, A. W., Hmiel, B., Vimont, I., Hua, Q., Yang, B., Menking, J. A., Shackleton, S., Rhodes, R., Baggenstos, D., Bauska, T. K., Bock, M., Seth, B., Harth, C. M., Beaudette, R., Schmitt, J., Brook, E., Weiss, R. F., Fischer, H., Severinghas, J., & McConnel, J. P. (2016). Radioactive and stable paleoatmospheric methane isotopes across the last deglaciation and early holocene from Taylor Glacier, Antarctica. AGU Fall Meeting, 12-16 December 2016. San Francisco, American Geophysical Union. Retrieved from: https://agu.confex.com/agu/fm16/meetingapp.cgi/Paper/183684en_AU
dc.identifier.conferenceenddate16 December 2016en_AU
dc.identifier.conferencenameAGU Fall Meeting, 12-16 December 2016. San Francisco, American Geophysical Union.en_AU
dc.identifier.conferenceplaceSan Franciscoen_AU
dc.identifier.conferencestartdate12 December 2016en_AU
dc.identifier.govdoc7735en_AU
dc.identifier.urihttps://agu.confex.com/agu/fm16/meetingapp.cgi/Paper/183684en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/9106en_AU
dc.language.isoenen_AU
dc.publisherAmerican Geophysical Unionen_AU
dc.subjectPleistocene epochen_AU
dc.subjectGlaciersen_AU
dc.subjectGreenhouse gasesen_AU
dc.subjectPaleoclimatologyen_AU
dc.subjectClimatic changeen_AU
dc.subjectAntarcticaen_AU
dc.subjectGreenlanden_AU
dc.subjectMethaneen_AU
dc.titleRadioactive and stable paleoatmospheric methane isotopes across the last deglaciation and early holocene from Taylor Glacier, Antarcticaen_AU
dc.typeConference Posteren_AU
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