Constraining the sources of the CH4 increase during the Oldest Dryas-Bølling abrupt warming event using 14CH4 measurements from Taylor Glacier, Antarctica

Simple item page
dc.contributor.authorDyonisius, MNen_AU
dc.contributor.authorPetrenko, VVen_AU
dc.contributor.authorSmith, AMen_AU
dc.contributor.authorHmiel, Ben_AU
dc.contributor.authorHua, Qen_AU
dc.contributor.authorHarth, CMen_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.authorBeaudette, Ren_AU
dc.contributor.authorSchmitt, Jen_AU
dc.contributor.authorPalardy, Aen_AU
dc.contributor.authorBrook, EJen_AU
dc.contributor.authorWeiss, RFen_AU
dc.contributor.authorFischer, Hen_AU
dc.contributor.authorSeveringhaus, JPen_AU
dc.date.accessioned2020-06-10T09:42:53Zen_AU
dc.date.available2020-06-10T09:42:53Zen_AU
dc.date.issued2016-03-07en_AU
dc.date.statistics2020-05-28en_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. Low latitude wetlands are the largest natural source of CH¬4 to the atmosphere. It has been proposed, however, that in the future warming world emissions from marine CH4 clathrates and Arctic permafrost might increase significantly. CH4 isotopes from ice cores in Greenland and Antarctica have been used to constrain the past CH¬4 budget. 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). We have successfully collected six large volume (~1000 kg) samples of ancient ice from Taylor Glacier, Antarctica that span the Oldest Dryas – Bølling (OD-BO) CH4 transition (~14.5ka). The OD-BO is the first large abrupt CH4 increase following the Last Glacial Maximum, with atmospheric CH4 increasing by ≈30% in the span of ≈ 200 years. All samples have recently been successfully measured for 14CH4, δ13C-CH4, and δD-CH4. 14CH4 measurements of accompanying procedural blanks show that effects from extraneous carbon addition during processing are small. Results are currently undergoing corrections for in-situ cosmogenic 14C based on 14CO measurements in the same samples. We will present the corrected 14CH4 results and preliminary interpretation with regard to causes of the OD-BO CH4 increase.en_AU
dc.identifier.citationDoyonisius, M., Petrenko, V. V., Smith, A., Hmiel, B., Hua, Q., Harth, C., Baggenstos, D., Bauska, T., Bauska, T., Bock, M., Beck, J., Seth, B., Baudette, R., Schmitt, J., Palardy, A., Brooks, E., Weiss, R., Fischer, H., & Severinghaus, J. (2016). Constraining the sources of the CH4 increase during the Oldest Dryas-Bølling abrupt warming event using 14CH4 measurements from Taylor Glacier, Antarctica. Paper presented at the IPICS 2016, International Partnerships in Ice Core Sciences, Second Open Science Conference, 7-11 March 2016, Hobart, Tasmania.en_AU
dc.identifier.conferenceenddate11 March 2016en_AU
dc.identifier.conferencenameIPICS 2016, International Partnerships in Ice Core Sciences, Second Open Science Conferenceen_AU
dc.identifier.conferenceplaceHobart, Tasmaniaen_AU
dc.identifier.conferencestartdate7 March 2016en_AU
dc.identifier.govdoc9603en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/9542en_AU
dc.language.isoenen_AU
dc.publisherAntarctic Climate and Ecosystems Cooperative Research Centreen_AU
dc.subjectMethaneen_AU
dc.subjectGlaciersen_AU
dc.subjectAntarctic regionsen_AU
dc.subjectClimatesen_AU
dc.subjectPaleoclimatologyen_AU
dc.subjectClimatic changeen_AU
dc.subjectGreenhouse effecten_AU
dc.subjectDrill coresen_AU
dc.subjectGreenlanden_AU
dc.subjectPermafrosten_AU
dc.titleConstraining the sources of the CH4 increase during the Oldest Dryas-Bølling abrupt warming event using 14CH4 measurements from Taylor Glacier, Antarcticaen_AU
dc.typeConference Abstracten_AU
Files
Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
IPICS+2016+-+Abstracts(1).pdf
Size:
1.49 MB
Format:
Adobe Portable Document Format
Description:
Download
License bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
license.txt
Size:
1.71 KB
Format:
Item-specific license agreed upon to submission
Description:
Download
Collections
Conference Publications