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Is there any Evidence for Regional Atmospheric 14C Offsets in the Southern Hemisphere?

Published online by Cambridge University Press:  09 February 2016

Alan Hogg ,
Chris Turney ,
Jonathan Palmer ,
Ed Cook  and
Brendan Buckley
Alan Hogg*
Affiliation:
Radiocarbon Laboratory, University of Waikato, PB 3105, Hamilton 3240, New Zealand
Chris Turney
Affiliation:
Climate Change Research Centre and School of Biological, Earth and Environmental Sciences, University of New South Wales, Sydney, NSW 2052, Australia
Jonathan Palmer
Affiliation:
Gondwana Tree-Ring Laboratory, P.O. Box 14, Little River, Canterbury 7546, New Zealand
Ed Cook
Affiliation:
Tree-Ring Laboratory of the Lamont Doherty Earth Observatory, Palisades, New York 10964, USA
Brendan Buckley
Affiliation:
Tree-Ring Laboratory of the Lamont Doherty Earth Observatory, Palisades, New York 10964, USA
*
Corresponding author. Email: alan.hogg@waikato.ac.nz.
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Abstract

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Center for Accelerator Mass Spectrometry (CAMS) Tasmanian Huon pine (Lagarostrobos franklinii) decadal measurements for the interval AD 745–855 suggest a mean interhemispheric radiocarbon offset (20 ± 5 yr), which is considerably lower than the previously reported mean interhemispheric offset for the last 2 millennia (44 ± 17 yr). However, comparable University of Waikato (Wk) New Zealand kauri (Agathis australis) measurements show significantly higher values (56 ± 6 yr), suggesting the possibility of a temporary geographic (intrahemispheric) offset between Tasmania, Australia, and Northland, New Zealand, during at least 1 common time interval. Here, we report 9 new Wk Tasmanian Huon pine measurements from the decades showing the largest Huon/kauri difference. We show statistically indistinguishable Wk Huon and Wk kauri 14C ages, thus dispelling the suggestion of a 14C geographic offset between Tasmania and Northland.

Type
Research Article
Information
Radiocarbon , Volume 55 , Issue 4: IntCal 13 , 2013 , pp. 2029 - 2034
Copyright
Copyright © 2013 by the Arizona Board of Regents on behalf of the University of Arizona 

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