Variations in tree-ring 14C for the younger dryas

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dc.contributor.authorHua, Qen_AU
dc.contributor.authorBarbetti, Men_AU
dc.contributor.authorFink, Den_AU
dc.contributor.authorLevchenko, VAen_AU
dc.contributor.authorZoppi, Uen_AU
dc.contributor.authorSmith, AMen_AU
dc.contributor.authorBertuch, Fen_AU
dc.date.accessioned2020-10-25T23:59:21Zen_AU
dc.date.available2020-10-25T23:59:21Zen_AU
dc.date.issued2009-05-15en_AU
dc.date.statistics2020-10-26en_AU
dc.description.abstractOf all millennial-scale paleoclimate reversals during the Last Glacial Cycle, the Younger Dryas (YD), from ~13 to 11.6 cal kyr BP, has attracted the most attention and controversy. The debate centres on understanding the physical mechanisms for such an abrupt change in climate and radiocarbon, which are associated with small changes in solar output and/or major changes in earth-system interactions dealing with oceanic circulation and exchanges between the carbon reservoirs. The leads and lags between climatic proxy records of the YD event are at the heart of such research. Unfortunately, one of the problems is that there is no reliable, direct atmospheric 14C record based on tree-ring chronology for the whole YD period, thus negating any possibility of locking in the critical time marker of its initiation. Here we present new high-precision, high-resolution radiocarbon measurements for the early YD chronozone derived from 4 sub-fossil logs of Huon pine with clearly defined annual tree rings. These logs were excavated from alluvial sediments along Stanley River in north-western Tasmania, Australia. A floating 617-ring Huon pine chronology has been constructed based on ring width and AMS radiocarbon measurements. Our 14C record, covering an age range from 10,350 to 10,760 14C years BP, has been linked to the European absolute tree-ring and floating Late Glacial Pine chronologies, bridging the current gap in the European tree-ring 14C chronologies during the early YD. A continuous and reliable atmospheric 14C record for the past 14 cal kyr BP is now available. This allows a more precise determination of the timing in observed climatic and environmental parameters and allows for a critical evaluation of mechanisms of atmospheric 14C variations for the YD.en_AU
dc.identifier.citationHua, Q., Barbetti, M., Fink, D., Levchenko, V. A., Zoppi, U., Smith, A. M., & Bertuch, F. (2009). Variations in tree-ring 14C for the younger dryas. Paper presented at the Past Climates meeting, Wellington New Zealand, May 15-17, 2009.en_AU
dc.identifier.conferenceenddate17 May 2009en_AU
dc.identifier.conferencenamePast Climates meetingen_AU
dc.identifier.conferenceplaceWellington, New Zealanden_AU
dc.identifier.conferencestartdate15 May 2009en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/9939en_AU
dc.language.isoenen_AU
dc.publisherGNS Scienceen_AU
dc.subjectGlaciersen_AU
dc.subjectClimatesen_AU
dc.subjectCarbon 14en_AU
dc.subjectIsotope datingen_AU
dc.subjectTree ringsen_AU
dc.subjectSolar activityen_AU
dc.subjectAlluvial depositsen_AU
dc.subjectTasmaniaen_AU
dc.subjectPinesen_AU
dc.subjectConifersen_AU
dc.titleVariations in tree-ring 14C for the younger dryasen_AU
dc.typeConference Presentationen_AU
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