Articles | Volume 18, issue 5
Research article
24 May 2022
Research article |  | 24 May 2022

A multi-ice-core, annual-layer-counted Greenland ice-core chronology for the last 3800 years: GICC21

Giulia Sinnl, Mai Winstrup, Tobias Erhardt, Eliza Cook, Camilla Marie Jensen, Anders Svensson, Bo Møllesøe Vinther, Raimund Muscheler, and Sune Olander Rasmussen

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Cited articles

Abbott, P. M. and Davies, S. M. Volcanism and the Greenland ice-cores: the tephra record, Earth-Sci. Rev., 115, 173–191,, 2012. 
Abbott, P. M., Jensen, B. J. L., Lowe, D. J., Suzuki, T., and Veres, D.: Crossing new frontiers: extending tephrochronology as a global geoscientific research tool, J. Quaternary Sci., 35, 1–8,, 2020. 
Adolphi, F. and Muscheler, R.: Synchronizing the Greenland ice core and radiocarbon timescales over the Holocene – Bayesian wiggle-matching of cosmogenic radionuclide records, Clim. Past, 12, 15–30,, 2016. 
Adolphi, F., Bronk Ramsey, C., Erhardt, T., Edwards, R. L., Cheng, H., Turney, C. S. M., Cooper, A., Svensson, A., Rasmussen, S. O., Fischer, H., and Muscheler, R.: Connecting the Greenland ice-core and U/Th timescales via cosmogenic radionuclides: testing the synchroneity of Dansgaard–Oeschger events, Clim. Past, 14, 1755–1781,, 2018. 
Ahlstrøm, A. P. and PROMICE project team: A new Programme for Monitoring the Mass Loss of the Greenland Ice Sheet, Geol. Surv. Den. Greenl., 15, 61–64,, 2007. 

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Short summary
A new Greenland ice-core timescale, covering the last 3800 years, was produced using the machine learning algorithm StratiCounter. We synchronized the ice cores using volcanic eruptions and wildfires. We compared the new timescale to the tree-ring timescale, finding good alignment both between the common signatures of volcanic eruptions and of solar activity. Our Greenlandic timescales is safe to use for the Late Holocene, provided one uses our uncertainty estimate.