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Radiocarbon calibration uncertainties during the last deglaciation: Insights from new floating tree-ring chronologies.(Report)

Adolphi, Florian ; Muscheler, Raimund ; Friedrich, Michael ; Guttler, Dominik ; Wacker, Lukas ; Talamo, Sahra ; Kromer, Bernd

Quaternary Science Reviews, August 15, 2017, Vol.170, p.98 [Periódico revisado por pares]

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  • Título:
    Radiocarbon calibration uncertainties during the last deglaciation: Insights from new floating tree-ring chronologies.(Report)
  • Autor: Adolphi, Florian ; Muscheler, Raimund ; Friedrich, Michael ; Guttler, Dominik ; Wacker, Lukas ; Talamo, Sahra ; Kromer, Bernd
  • Assuntos: Archaeology – Analysis ; Dendrochronology – Analysis
  • É parte de: Quaternary Science Reviews, August 15, 2017, Vol.170, p.98
  • Descrição: To access, purchase, authenticate, or subscribe to the full-text of this article, please visit this link: http://dx.doi.org/10.1016/j.quascirev.2017.06.026 Byline: Florian Adolphi [Florian.Adolphi@geol.lu.se] (a,b,*), Raimund Muscheler (a), Michael Friedrich (c,d), Dominik Guttler (e), Lukas Wacker (e), Sahra Talamo (f), Bernd Kromer (c) Keywords Radiocarbon dating; IntCal; Cosmogenic isotopes; Ice cores; Tree-rings; Deglaciation Highlights * 14C on new floating tree-ring chronologies covering the Bolling (~14.1--14.7 kaBP). * Anchored on ice core timescale via 14C/10Be comparison with high precision. * New data reveal large centennial 14C excursions during what appears in IntCal13 as a 14C-age plateau. * Lack of structure in IntCal13 leads to erroneous calibrated ages by up to 500 years during the Bolling. * Highlight the potential of ice core 10Be to improve radiocarbon calibration. Abstract Radiocarbon dating is the most commonly used chronological tool in archaeological and environmental sciences dealing with the past 50,000 years, making the radiocarbon calibration curve one of the most important records in paleosciences. For the past 12,560 years, the radiocarbon calibration curve is constrained by high quality tree-ring data. Prior to this, however, its uncertainties increase rapidly due to the absence of suitable tree-ring .sup.14C data. Here, we present new high-resolution .sup.14C measurements from 3 floating tree-ring chronologies from the last deglaciation. By using combined information from the current radiocarbon calibration curve and ice core .sup.10Be records, we are able to absolutely date these chronologies at high confidence. We show that our data imply large .sup.14C-age variations during the Bolling chronozone (Greenland Interstadial 1e) -- a period that is currently characterized by a long .sup.14C-age plateau in the most recent IntCal13 calibration record. We demonstrate that this lack of structure in IntCal13 may currently lead to erroneous calibrated ages by up to 500 years. Author Affiliation: (a) Department of Geology, Quaternary Sciences, Lund University, Solvegatan 12, 22362 Lund, Sweden (b) Climate and Environmental Physics, Physics Institute, University of Bern, Sidlerstrasse 5, 3012 Bern, Switzerland (c) Institute of Environmental Physics, University of Heidelberg, INF 229, 69120 Heidelberg, Germany (d) Department of Botany, Hohenheim University, Garbenstr. 30, 70599 Stuttgart, Germany (e) Ion Beam Physics, ETH Zurich, Otto-Stern-Weg 5, 8093 Zurich, Switzerland (f) Department of Human Evolution, Max Planck Institute for Evolutionary Anthropology, Deutscher Platz 6, 04103 Leipzig, Germany * Corresponding author. Department of Geology, Quaternary Sciences, Lund University, Solvegatan 12, 22362 Lund, Sweden. Article History: Received 20 January 2017; Revised 26 June 2017; Accepted 26 June 2017
  • Idioma: Inglês

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