A context-appropriate approach to marine 14C calibration: ΔR and Bayesian framework for the Nuvuk cemetery, Point Barrow, Alaska

Krus, A. , Jensen, A. M., Hamilton, W. D. and Sayle, K. (2019) A context-appropriate approach to marine 14C calibration: ΔR and Bayesian framework for the Nuvuk cemetery, Point Barrow, Alaska. Radiocarbon, 61(3), pp. 733-747. (doi:10.1017/RDC.2019.20)

[img]
Preview
Text
178448.pdf

1MB

Abstract

This study provides an assessment of the temporal changes in ΔR, which is the local deviation from the global surface water marine reservoir effect (MRE), in the Point Barrow area of the Alaskan Arctic, a coastal archaeological area that has experienced severe erosion accelerated by global warming. A total of 26 samples were submitted for radiocarbon (14C) dating from eight secure Thule (AD 1000–1750) archaeological contexts, and specifically from archaeological features with paired processed seal and caribou bones that had been frozen in situ. This new approach towards ΔR estimation provides a best-fit local correction for the 14C dating of human populations by focusing on the marine mammal (seals) predominantly consumed by the Thule (Coltrain et al. 2016). The weighted-mean ΔR value on these pairs is 450 ± 84 yr, which is about 50 years less than the weighted-mean (506 ± 69 yr) for the Point Barrow area calculated through 14C measurements from four known-age bivalves collected in AD 1913 (McNeely et al. 2006). The effects of using this new ΔR value for calibration was assessed through the Bayesian chronological modeling of 54 14C measurements from samples of human skeletons interred in the Nuvuk cemetery at Point Barrow, the largest ancient cemetery in northwest Alaska and traditionally thought to date to the Thule and earlier Birnirk (AD 500–1000) periods.

Item Type:Articles
Additional Information:Portions of this research have been funded by the National Science Foundation (Award # OPP-0726253, OPP-1263848, OPP-1355975) and the Carnegie Trust for the Universities of Scotland
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Sayle, Dr Kerry and Hamilton, Dr Derek and Krus, Dr Tony
Authors: Krus, A., Jensen, A. M., Hamilton, W. D., and Sayle, K.
College/School:College of Science and Engineering > Scottish Universities Environmental Research Centre
Journal Name:Radiocarbon
Publisher:Cambridge University Press
ISSN:0033-8222
ISSN (Online):1945-5755
Published Online:23 April 2019
Copyright Holders:Copyright © 2019 by the Arizona Board of Regents on behalf of the University of Arizona
First Published:First published in Radiocarbon 61(3):733-747
Publisher Policy:Reproduced in accordance with the publisher copyright policy

University Staff: Request a correction | Enlighten Editors: Update this record