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Raimund Muscheler

Raimund Muscheler

Professor

Raimund Muscheler

Tree rings and ice cores reveal C-14 calibration uncertainties during the Younger Dryas

Author

  • Raimund Muscheler
  • B Kromer
  • Svante Bj√∂rck
  • A Svensson
  • M Friedrich
  • K F Kaiser
  • J Southon

Summary, in English

The Younger Dryas interval during the Last Glacial Termination was an abrupt return to glacial-like conditions punctuating the transition to a warmer, interglacial climate. Despite recent advances in the layer counting of ice-core records of the termination, the timing and length of the Younger Dryas remain controversial. Also, a steep rise in the concentration of atmospheric radiocarbon at the onset of the interval, recorded primarily in the Cariaco Basin, has been difficult to reconcile with simulations of the Younger Dryas carbon cycle. Here we discuss a radiocarbon chronology from a tree-ring record covering the Late Glacial period that has not been absolutely dated. We correlate the chronology to ice-core timescales using the common cosmic production signal in tree-ring C-14 and ice-core Be-10 concentrations. The results of this correlation suggest that the Cariaco record may be biased by changes in the concentration of radiocarbon in the upper ocean during the early phase of the Younger Dryas climate reversal in the Cariaco basin. This bias in the marine record may also affect the accuracy of a widely used radiocarbon calibration curve over this interval. Our tree-ring-based radiocarbon record is easily reconciled with simulated production rates and carbon-cycle changes associated with reduced ocean ventilation during the Younger Dryas.

Department/s

  • Quaternary Sciences

Publishing year

2008

Language

English

Pages

263-267

Publication/Series

Nature Geoscience

Volume

1

Issue

4

Document type

Journal article

Publisher

Nature Publishing Group

Topic

  • Geology

Status

Published

ISBN/ISSN/Other

  • ISSN: 1752-0908