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Radiocarbon Levels in the Iceland Sea from 25–53 kyr and their Link to the Earth's Magnetic Field Intensity

Published online by Cambridge University Press:  18 July 2016

Antje H L Voelker ,
Pieter M Grootes ,
Marie-Josee Nadeau  and
Michael Sarnthein
Antje H L Voelker*
Affiliation:
Leibniz–Labor für Altersbestimmung und Isotopenforschung, Universität Kiel, Max-Eyth Strasse 11-13, D-24118 Kiel, Germany
Pieter M Grootes
Affiliation:
Leibniz–Labor für Altersbestimmung und Isotopenforschung, Universität Kiel, Max-Eyth Strasse 11-13, D-24118 Kiel, Germany
Marie-Josee Nadeau
Affiliation:
Leibniz–Labor für Altersbestimmung und Isotopenforschung, Universität Kiel, Max-Eyth Strasse 11-13, D-24118 Kiel, Germany
Michael Sarnthein
Affiliation:
Institut für Geowissenschaften, Universität Kiel, Olshausenstrasse 40, D-24118 Kiel, Germany
*
Email: antje@sfb313.uni-kiel.de
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Abstract

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By correlating the climate records and radiocarbon ages of the planktonic foraminifera N. pachyderma(s) of deep-sea core PS2644 from the Iceland Sea with the annual-layer chronology of the GISP2 ice core, we obtained 80 marine 14C calibration points for the interval 11.4-53.3 ka cal BP. Between 27 and 54 ka cal BP the continuous record of 14C/cal age differences reveals three intervals of highly increased 14C concentrations coincident with low values of paleomagnetic field intensity, two of which are attributed to the geomagnetic Mono Lake and Laschamp excursions (33.5-34.5 ka cal BP with maximum 550 marine δ14C, and 40.3-41.7 ka cal BP with maximum 1215 marine δ14C, respectively). A third maximum (marine δ14C: 755) is observed around 38 ka cal BP and attributed to the geomagnetic intensity minimum following the Laschamp excursion. During all three events the A14C values increase rapidly with maximum values occurring at the end of the respective geomagnetic intensity minimum. During the Mono Lake Event, however, our A14C values seem to underestimate the atmospheric level, if compared to the 36Cl flux measured in the GRIP ice core (Wagner et al. 2000) and other records. As this excursion coincides with a meltwater event in core PS2644, the underestimation is probably caused by an increased planktonic reservoir age. The same effect also occurs from 38.5 to 40 ka cal BP when the meltwater lid of Heinrich Event 4 affected the planktonic record.

Type
Comparison Records
Information
Radiocarbon , Volume 42 , Issue 3 , 2000 , pp. 437 - 452
Copyright
Copyright © 2000 The Arizona Board of Regents on behalf of the University of Arizona 

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