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

Abstract
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
Journal Article
Type of thesis
Series
Citation
Hogg, A. G., Turney, C. S. M., Palmer, J. G., Cook, E. & Buckley, B. (2013). Is there any Evidence for Regional Atmospheric 14C Offsets in the Southern Hemisphere? Radiocarbon, 55(2), 1-6.
Date
2013
Publisher
The University of Arizona
Degree
Supervisors
Rights
This article has been published in the journal: Radiocarbon. © 2013 by the Arizona Board of Regents on behalf of the University of Arizona. Used with permission.