Atmospheric radiocarbon at the end of the last glacial; an estimate based on AMS radiocarbon dates on terrestrial macrofossils from lake sediments

Zbinden, Hugo; Andree, Michael; Oeschger, Hans; Ammann, Brigitta; Lotter, André F.; Bonani, Georges; Wölfli, Willy (1989). Atmospheric radiocarbon at the end of the last glacial; an estimate based on AMS radiocarbon dates on terrestrial macrofossils from lake sediments. Radiocarbon, 31(3), pp. 795-804. Arizona Board of Regents, University of Arizona 10.1017/S0033822200012418

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The main purpose of this work is to reconstruct the atmospheric DELTA-C-14 in the glacial-postglacial transition, 14,000 - 10,000 BP, a range not covered by the tree-ring calibration curve. We measured C-14/C-12 ratios on series of terrestrial macrofossils from sediments of two Swiss lakes. We selected exclusively plant remains of recognizable terrestrial origin that are not affected by hard water and thus reflect atmospheric C-14 concentration. Due to the scarcity of such material, we used accelerator mass spectroscopy. Cores of two lakes were measured to eliminate local effects and to check the reproducibility of results. This requires a reliable, C-14-independent correlation of the cores, obtained through local pollen zone boundaries. C-14 ages were obtained as a function of the depth in the cores. If sedimentation rates are known, ages can be converted into DELTA-C-14 values. We also attempted estimating sedimentation rates; calculations are based on the Swedish varve chronology. Results were combined to form an entire data set. The DELTA-C-14 curve shows an increase with time during the Allerod and decreases during Preboreal and Bolling periods. Probabilities for these C-14 variations are discussed.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Department of Biology > Institute of Plant Sciences (IPS) > Palaeoecology
08 Faculty of Science > Department of Biology > Institute of Plant Sciences (IPS)

UniBE Contributor:

Ammann, Brigitta and Lotter, André Franz

Subjects:

500 Science > 580 Plants (Botany)

ISSN:

0033-8222

Publisher:

Arizona Board of Regents, University of Arizona

Language:

English

Submitter:

Peter Alfred von Ballmoos-Haas

Date Deposited:

15 Jan 2018 15:56

Last Modified:

28 Oct 2019 04:08

Publisher DOI:

10.1017/S0033822200012418

Additional Information:

13TH INTERNATIONAL RADIOCARBON CONF, DUBROVNIK, YUGOSLAVIA, JUN 20-25, 1988

BORIS DOI:

10.7892/boris.106891

URI:

https://boris.unibe.ch/id/eprint/106891

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