Findings from an in-Depth Annual Tree-Ring Radiocarbon Intercomparsion

Lukas Wacker*, E. M. Scott, A. Bayliss, David Brown, E. Bard, Silvia Bollhalder, M. Friedrich, Manuela Capano, Alexander Cherkinsky, D Chivall, Brendan J. Culleton, M W Dee, Ronny Friedrich, G W L Hodgin, A Hogg, D J Kennet, T D J Knowles, M Kuitems, T E Lange, F MiyakeM-J Nadeau, T Nakamura, J P Naysmith, J Olsen, T Omori, F Petchey, B Philippsen, C Bronk Ramsey, G V Ravi Prasad, M Seiler, J Southon, R Staff, T Tuna

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)
61 Downloads (Pure)


In 2018 Pearson et al. published a new sequence of annual radiocarbon (14C) data derived from oak (Quercus sp.) trees from Northern Ireland and bristlecone pine (Pinus longaeva) from North America across the period 1700–1500 BC. The study indicated that the more highly resolved shape of an annually based calibration dataset could improve the accuracy of 14C calibration during this period. This finding had implications for the controversial dating of the eruption of Thera in the Eastern Mediterranean. To test for interlaboratory variation and improve the robustness of the annual dataset for calibration purposes, we have generated a replicate sequence from the same Irish oaks at ETH Zürich. These data are compatible with the Irish oak 14C dataset previously produced at the University of Arizona and are used (along with additional data) to examine inter-tree and interlaboratory variation in multiyear annual 14C time-series. The results raise questions about regional 14C offsets at different scales and demonstrate the potential of annually resolved 14C for refining sub decadal and larger scale features for calibration, solar reconstruction, and multiproxy synchronization.
Original languageEnglish
Pages (from-to)873 - 882
Issue number4: (Calibration Issue)
Publication statusPublished - 04 Sept 2020
Event23rd International Radiocarbon Conference - Norwegian University of Science and Technology, Trondheim, Norway
Duration: 17 Jun 201822 Jun 2018


  • annual, 14C, calibration, dendrochronology, Thera.


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