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Implications of Dipole Moment Secular Variation from 50,000–10,000 Years for the Radiocarbon Record

Published online by Cambridge University Press:  18 July 2016

R. S. Sternberg  and
P. E. Damon
R. S. Sternberg
Affiliation:
Department of Geosciences, Franklin & Marshall College, Lancaster, Pennsylvania 17604-3003 USA
P. E. Damon
Affiliation:
Department of Geosciences, Franklin & Marshall College, Lancaster, Pennsylvania 17604-3003 USA
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Abstract

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Sparse paleointensity data from 10–50 ka suggest that the average dipole moment (DM) was 50–75% of the average of 8.67 μ 1022 A m2 for the past 5 Ma, and 8.75 μ 1022 for the past 12 ka. A linear ramp function, increasing the DM from 4 to 8.75 μ 1022 A m2 between 50–10 ka BP, generates a total 14C inventory of 126 dpm/cme 2, agreeing very well with an inventory assay of 128 dpm/cme 2, which includes 14C in sediments. With the Lingenfelter and Ramaty (1970) production function and a model DC gain of about 100, this DM function would give a Δ14C of 500‰ at 20 ka BP, consistent with the Barbados coral record, and also gives a good match to the Holocene record. A Laschamp geomagnetic event at about 45 ka BP, with a DM of 25% of its average value and lasting 5 ka, would only increase the present inventory by 0.3–1.2 dpm/cme 2, and would probably have only a small effect on Δ14C at 20 ka BP, but could produce a short-lived 14C spike of over 500‰.

Type
Articles
Information
Radiocarbon , Volume 34 , Issue 2 , 1992 , pp. 189 - 198
Copyright
Copyright © The American Journal of Science 

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