Journal
RADIOCARBON
Volume 62, Issue 4, Pages 919-937Publisher
UNIV ARIZONA DEPT GEOSCIENCES
DOI: 10.1017/RDC.2020.16
Keywords
calibration; radiocarbon; IntCal; tree rings
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Funding
- Gabrielle O. Vierra Memorial Fund
- W.M. Keck foundation
- UCI
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As part of the ongoing effort to improve the Northern Hemisphere radiocarbon (C-14) calibration curve, this study investigates the period of 856 BC to 626 BC (2805-2575 yr BP) with a total of 403 single-year C-14 measurements. In this age range, IntCal13 was constructed largely from German and Irish oak as well as Californian bristlecone pine C-14 dates, with most samples measured with a 10-yr resolution. The new data presented here is the first atmospheric C-14 single-year record of the older end of the Hallstatt plateau based on an absolutely dated tree-ring chronology. The data helped reveal a major solar proton event (SPE) which caused a spike in the production rate of cosmogenic radionuclides around 2610/2609 BP. This production event is thought to have reached a magnitude similar to the 774/775 AD production event but has remained undetected due to averaging effects in the decadal calibration data. The record leading up to the 2610/2609 BP event reveals a 11-yr solar cycle with varying cyclicity. Features of the new data and the benefits of higher resolution calibration are discussed.
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