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Timing of the late-glacial climate reversal in the Southern Hemisphere using high-resolution radiocarbon chronology for Kaipo Bog, New Zealand

Published online by Cambridge University Press:  20 January 2017

Irka Hajdas ,
David J. Lowe ,
Rewi M. Newnham  and
Georges Bonani
Irka Hajdas*
Affiliation:
PSI c/o ETH/PSI AMS 14C Laboratory Hönggerberg, HPK H27, 8093 Zurich, Switzerland
David J. Lowe
Affiliation:
Department of Earth Sciences, University of Waikato, Private Bag 3105, Hamilton, New Zealand
Rewi M. Newnham
Affiliation:
School of Geography, University of Plymouth, Plymouth PL4 8AA, UK
Georges Bonani
Affiliation:
ETH Institut für Teilchenphysik, ETH/PSI AMS 14C Laboratory Hönggerberg, HPK H30, 8093 Zurich, Switzerland
*
*Corresponding author. Fax: +41 1 633 1067.E-mail address:[email protected](I. Hajdas).
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Abstract

The pattern of climate change in the Southern Hemisphere during the Younger Dryas (YD) chronozone provides essential constraint on mechanisms of abrupt climate change only if accurate, high-precision chronologies are obtained. A climate reversal reported previously at Kaipo bog, New Zealand, had been dated between 13,600 and 12,600 cal yr B.P. and appeared to asynchronously overlap the YD chron, but the chronology, based on conventionally radiocarbon-dated bulk sediment samples, left the precise timing questionable. We report a new high-resolution AMS 14C chronology for the Kaipo record that confirms the original chronology and provides further evidence for a mid-latitude Southern Ocean cooling event dated between 13,800 and 12,400 cal yr B.P. (2σ range), roughly equivalent to the Antarctic Cold Reversal.

Keywords

Late-glacialClimate reversalAbrupt climate changeYounger DryasAntarctic Cold ReversalInterhemispheric asynchronyRadiocarbon datingTephrochronologyWiggle matchingHigh-resolution palynologyKaipo bogNew Zealand
Type
Short Paper
Information
Quaternary Research , Volume 65 , Issue 02 , March 2006 , pp. 340 - 345
Copyright
University of Washington

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