Articles | Volume 20, issue 11
https://doi.org/10.5194/cp-20-2617-2024
https://doi.org/10.5194/cp-20-2617-2024
Research article
 | 
27 Nov 2024
Research article |  | 27 Nov 2024

Precise dating of deglacial Laptev Sea sediments via 14C and authigenic 10Be∕9Be – assessing local 14C reservoir ages

Arnaud Nicolas, Gesine Mollenhauer, Johannes Lachner, Konstanze Stübner, Maylin Malter, Jutta Wollenburg, Hendrik Grotheer, and Florian Adolphi

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Cited articles

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, https://doi.org/10.5194/cp-12-15-2016, 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, https://doi.org/10.5194/cp-14-1755-2018, 2018. 
Adolphi, F., Herbst, K., Nilsson, A., and Panovska, S.: On the Polar Bias in Ice Core 10Be Data, J. Geophys. Res.-Atmos., 128, e2022JD038203, https://doi.org/10.1029/2022JD038203, 2023. 
Akhmadaliev, S., Heller, R., Hanf, D., Rugel, G., and Merchel, S.: The new 6MV AMS-facility DREAMS at Dresden, Nucl. Instrum. Meth. B, 294, 5–10, https://doi.org/10.1016/j.nimb.2012.01.053, 2013. 
Alves, E. Q., Macario, K., Ascough, P., and Bronk Ramsey, C.: The Worldwide Marine Radiocarbon Reservoir Effect: Definitions, Mechanisms, and Prospects, Rev. Geophys., 56, 278–305, https://doi.org/10.1002/2017RG000588, 2018. 
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Short summary
We use the authigenic 10Be/9Be record of a Laptev Sea sediment core for the period 8–14 kyr BP and synchronize it with the 10Be records from absolutely dated ice cores. We employed a likelihood function to calculate the ΔR values. A benthic ΔR value of +345±60 14C years was estimated, which corresponds to a marine reservoir age of 848±90 14C years. This new ΔR value was used to refine the age–depth model for core PS2458-4, establishing it as a potential reference chronology for the Laptev Sea.
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