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Anomalous 11-Year Δ14C Cycle at High Latitudes?

Published online by Cambridge University Press:  18 July 2016

P. E. Damon ,
George Burr ,
W. J. Cain  and
D. J. Donahue
P. E. Damon
Affiliation:
NSF-Arizona Accelerator Facility for Radioisotope Analysis, The University of Arizona, Tucson Arizona 85721 USA
George Burr
Affiliation:
NSF-Arizona Accelerator Facility for Radioisotope Analysis, The University of Arizona, Tucson Arizona 85721 USA
W. J. Cain
Affiliation:
NSF-Arizona Accelerator Facility for Radioisotope Analysis, The University of Arizona, Tucson Arizona 85721 USA Department of Chemistry, Loyola-Marymount University, Los Angeles, California 90045 USA
D. J. Donahue
Affiliation:
NSF-Arizona Accelerator Facility for Radioisotope Analysis, The University of Arizona, Tucson Arizona 85721 USA
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Abstract

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We find no evidence for an anomalously intense 11-yr cycle in Δ14C at high latitudes during the period, AD 1870–1885, as reported by Fan et al. (1983, 1986). However, there does appear to be a regional effect within the MacKenzie River region (67°N, 130°W), with atmospheric 14C depressed by relative to the Olympic Peninsula. Such an effect would require only 5% of CO2 in the air mass to have been derived from 5% 14C-depleted soil gas CO2. This small but apparently significant regional effect could be caused by accumulation of CO2 within the frozen earth followed by outgassing during the spring thaw. The short growing season would enhance the effect by allowing insufficient time for global atmospheric equilibration.

Type
Articles
Information
Radiocarbon , Volume 34 , Issue 2 , 1992 , pp. 235 - 238
Copyright
Copyright © The American Journal of Science 

References

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