SHCal20 Southern Hemisphere calibration, 0-55,000 years cal BP

Hogg, Alan G., Heaton, Timothy J., Hua, Quan, Palmer, Jonathan G., Turney, Chris S.M., Southon, John, Bayliss, Alex, Blackwell, Paul G., Boswijk, Gretel, Bronk Ramsey, Christopher, Pearson, Charlotte, Petchey, Fiona, Reimer, Paula, Reimer, Ron, and Wacker, Lukas (2020) SHCal20 Southern Hemisphere calibration, 0-55,000 years cal BP. Radiocarbon, 62 (4). pp. 759-778.

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Abstract

Early researchers of radiocarbon levels in Southern Hemisphere tree rings identified a variable North-South hemispheric offset, necessitating construction of a separate radiocarbon calibration curve for the South. We present here SHCal20, a revised calibration curve from 0-55,000 cal BP, based upon SHCal13 and fortified by the addition of 14 new tree-ring data sets in the 2140-0, 3520-3453, 3608-3590 and 13,140-11,375 cal BP time intervals. We detail the statistical approaches used for curve construction and present recommendations for the use of the Northern Hemisphere curve (IntCal20), the Southern Hemisphere curve (SHCal20) and suggest where application of an equal mixture of the curves might be more appropriate. Using our Bayesian spline with errors-in-variables methodology, and based upon a comparison of Southern Hemisphere tree-ring data compared with contemporaneous Northern Hemisphere data, we estimate the mean Southern Hemisphere offset to be 36 ± 27 C yrs older.

Item ID: 66770
Item Type: Article (Research - C1)
ISSN: 1945-5755
Keywords: carbon cycle, Inter-Tropical Convergence Zone (ITCZ), interhemispheric gradient (IHG), North-South hemispheric offset, Southern Ocean, tropical and sub-tropical radiocarbon calibration
Copyright Information: © 2020 by the Arizona Board of Regents on behalf of the University of Arizona. This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.
Date Deposited: 25 May 2021 00:48
FoR Codes: 43 HISTORY, HERITAGE AND ARCHAEOLOGY > 4301 Archaeology > 430101 Archaeological science @ 100%
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