Please use this identifier to cite or link to this item: https://apo.ansto.gov.au/dspace/handle/10238/9939
Title: Variations in tree-ring 14C for the younger dryas
Authors: Hua, Q
Barbetti, M
Fink, D
Levchenko, VA
Zoppi, U
Smith, AM
Bertuch, F
Keywords: Glaciers
Climates
Carbon 14
Isotope dating
Tree rings
Solar activity
Alluvial deposits
Tasmania
Pines
Conifers
Issue Date: 15-May-2009
Publisher: GNS Science
Citation: Hua, 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.
Abstract: Of 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.
URI: https://apo.ansto.gov.au/dspace/handle/10238/9939
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