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14C and Other Parameters During the Younger Dryas Cold Phase

Published online by Cambridge University Press:  18 July 2016

Hans Oeschger ,
Max Welten ,
Ulrich Eicher ,
Markus Möll ,
Trudi Riesen ,
Ulrich Siegenthaler  and
Samuel Wegmüller
Hans Oeschger
Affiliation:
Physics Institute, University of Bern, Switzerland
Max Welten
Affiliation:
Institute for Systematic and Geo-Botany, University of Bern, Switzerland
Ulrich Eicher
Affiliation:
Physics Institute, University of Bern, Switzerland Institute for Systematic and Geo-Botany, University of Bern, Switzerland
Markus Möll
Affiliation:
Physics Institute, University of Bern, Switzerland
Trudi Riesen
Affiliation:
Physics Institute, University of Bern, Switzerland
Ulrich Siegenthaler
Affiliation:
Physics Institute, University of Bern, Switzerland
Samuel Wegmüller
Affiliation:
Institute for Systematic and Geo-Botany, University of Bern, Switzerland
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Abstract

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Pollen analysis as well as 18O/16O results on lake marl show that the Younger Dryas climatic period, between about 11,000 and 10,300 bp, was the last vigorous cold phase of the Würm Glacial. Detailed 14C analyses from a peat bog near Wachseldorn (Switzerland) point to a 14C anomaly in this period. Further indication of a 14C anomaly is given by the observation that, during the Younger Dryas period, the sedimentation rates in several lakes apparently were higher than in adjacent periods; an explanation might be that the 14C time scale was compressed between 11,000 and 10,000 bp, ie, the atmospheric 14C/C ratio varied. If real, this suggested 14C variation would probably be connected to the climatic events during this transition period from Later Glacial to Postglacial.

Type
Natural 14C Variations
Information
Radiocarbon , Volume 22 , Issue 2 , 1980 , pp. 299 - 310
Copyright
Copyright © The American Journal of Science 

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