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The Maunder Minimum: An Interlaboratory Comparison of Δ14C from AD 1688 to AD 1710

Published online by Cambridge University Press:  18 July 2016

Paul E Damon
Affiliation:
Department of Geosciences, PO Box 210077, University of Arizona, Tucson, Arizona 85721 USA
Christopher J Eastoe
Affiliation:
Department of Geosciences, PO Box 210077, University of Arizona, Tucson, Arizona 85721 USA
Irina B Mikheeva
Affiliation:
AF Ioffe Institute of Physics and Technology, Russian Academy of Science, St Petersburg, Russia
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Abstract

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Measurements on same-age tree-ring samples from proximal Ural Mountain trees by the Ioffe Institute research group and at the University of Arizona demonstrate a variance corresponding to a standard deviation of ±5.1% for Ioffe compared to ±2.1% for Tucson. There is also a calibration difference of 4.3 ±1.2 ‰. Comparison of the same years measured in Seattle on wood from the Pacific Northwest shows an offset of 2.2 ± 0.5 ‰. This is not a calibration error, but rather is expected from the well-documented evidence for divergence and upwelling of 14C-depleted CO2 along the west coast of North America.

Type
Articles
Copyright
Copyright © The American Journal of Science 

References

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