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

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 bee...

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Bibliographic Details
Published in:Quaternary Research
Main Authors: Hajdas, Irka, Lowe, David J., Newnham, Rewi M., Bonani, Georges
Format: Article in Journal/Newspaper
Language:English
Published: Academic Press 2006
Subjects:
late-glacial
climate reversal
abrupt climate change
Younger Dryas
Antarctic cold reversal
interhemispheric asynchrony
radiocarbon dating
tephrochronology
wiggle matching
high resolution palynology
Kaipo bog
New Zealand
Antarctic
Southern Ocean
The Antarctic
Antarc*
Online Access:https://hdl.handle.net/10289/928
https://doi.org/10.1016/j.yqres.2005.08.028
Description
Summary: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.

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