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Elastic Tie-Pointing—Transferring Chronologies between Records via a Gaussian Process

Published online by Cambridge University Press:  09 February 2016

Timothy J Heaton ,
Edouard Bard  and
Konrad A Hughen
Timothy J Heaton*
Affiliation:
School of Mathematics and Statistics, University of Sheffield, Sheffield S3 7RH, United Kingdom
Edouard Bard
Affiliation:
CEREGE, Aix-Marseille University, CNRS, IRD, Collège de France, Technopole de l'Arbois BP 80, 13545 Aix en Provence Cedex 4, France
Konrad A Hughen
Affiliation:
Department of Marine Chemistry & Geochemistry, Woods Hole Oceanographic Institution, Woods Hole, Massachusetts 02543, USA
*
Corresponding author. Email: t.heaton@sheffield.ac.uk.
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Abstract

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We consider a general methodology for the transferral of chronologies from a master reference record containing direct dating information to an undated record of interest that does not. Transferral is achieved through the identification, by an expert, of a series of tie-points within both records that are believed to correspond to approximately contemporaneous events. Through tying of the 2 records together at these points, the reference chronology is elastically deformed onto the undated record. The method consists of 3 steps: creation of an age-depth model for the reference record using its direct dating information; selection of the tie-points and translation of their age estimates from the reference to the undated record; and finally, creation of an age-depth model for the undated record using these uncertain tie-point age estimates. Our method takes full account of the uncertainties involved in all stages of the process to create a final chronology within the undated record that allows joint age estimates to be found together with their credible intervals. To achieve computational practicality, we employ a Gaussian process to create our age-depth models. Calculations can then be performed exactly without resort to extremely slow Monte Carlo methods involving multiple independent model fits that would be required by other age-depth models.

Type
Research Article
Information
Radiocarbon , Volume 55 , Issue 4: IntCal 13 , 2013 , pp. 1975 - 1997
Copyright
Copyright © 2013 by the Arizona Board of Regents on behalf of the University of Arizona 

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