The IntCal20 Northern Hemisphere radiocarbon age calibration curve (0-55 cal kBP)

Paula Reimer*, W.E.N. Austin, Edouard Bard, Alex Bayliss, Paul G. Blackwell, Christopher Bronk Ramsey, Martin Butzin, Hai Cheng, R. Lawrence Edwards, Michael Friedrich, Pieter M. Grootes, Thomas P. Guilderson, Irka Hajdas, Timothy J. Heaton, Alan. G. Hogg, Konrad A. Hughen, Bernd Kromer, Sturt W. Manning, Raimund Muscheler, Jonathan G. PalmerCharlotte Pearson, Johannes van der Plicht, Ron Reimer, David A. Richards, E. Marian Scott, John R. Southon, Christian S M Turney, Lukas Wacker, florian adolphi, Ulf Büntgen, Manuela Capano, Simon Fahrni, alexandra Fogtmann-Schulz, Ronny Friedrich, Fusa Miyake, jesper olsen, Frederick Reinig, Minoru Sakamoto, Adam sookdeo, Sahra Talamo

*Corresponding author for this work

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Abstract

Radiocarbon ages cannot provide absolutely-dated chronologies for archaeological or palaeoenvironmental studies directly, but must be converted to calendar age equivalents using a calibration curve compensating for fluctuations in atmospheric 14C concentration. Although calibration curves are constructed from independently-dated archives, they invariably require revision as new data become available and our understanding of the Earth system improves. In this volume the international radiocarbon calibration curves for both the Northern and Southern Hemispheres, as well as for the ocean surface layer, have been updated to include a wealth of new data and extended to 55,000 cal BP. Based on tree rings, IntCal20 now extends as a fully atmospheric record to c. 13,900 cal BP. For the older part of the timescale, IntCal20 comprises statistically integrated evidence from floating tree ring chronologies, lacustrine and marine sediments, speleothems, and corals. We utilized improved evaluation of the timescales and location variable 14C offsets from the atmosphere (reservoir age, dead carbon fraction) for each dataset. New statistical methods have refined the structure of the calibration curves while maintaining a robust treatment of uncertainties in the radiocarbon ages, the calendar ages and other corrections. The inclusion of modeled marine reservoir ages derived from a three-dimensional ocean circulation model has allowed us to apply more appropriate reservoir corrections to the marine 14C data rather than the previous use of constant regional offsets from the atmosphere. Here we provide an overview of the new and revised datasets and the associated methods used for the construction of the IntCal20 curve and explore potential regional offsets for tree ring data. We discuss the main differences with respect to the previous calibration curve, IntCal13, and some of the implications for archaeology and geosciences ranging from the recent past to the time of the extinction of the Neanderthals.
Original languageEnglish
JournalRadiocarbon
Publication statusAccepted - 10 Feb 2020

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    Reimer, P., Austin, W. E. N., Bard, E., Bayliss, A., Blackwell, P. G., Bronk Ramsey, C., Butzin, M., Cheng, H., Lawrence Edwards, R., Friedrich, M., Grootes, P. M., Guilderson, T. P., Hajdas, I., Heaton, T. J., Hogg, A. G., Hughen, K. A., Kromer, B., Manning, S. W., Muscheler, R., ... Talamo, S. (Accepted/In press). The IntCal20 Northern Hemisphere radiocarbon age calibration curve (0-55 cal kBP). Radiocarbon.