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A 36Cl Profile in Greenland Ice from AD 1265 to 1865

Published online by Cambridge University Press:  18 July 2016

N J Conard ,
P W Kubik ,
H E Gove  and
David Elmore
N J Conard
Affiliation:
Department of Anthropology, Yale University New Haven, Connecticut 06520
P W Kubik
Affiliation:
Nuclear Structure Research Laboratory, University of Rochester Rochester, New York 14627
H E Gove
Affiliation:
Nuclear Structure Research Laboratory, University of Rochester Rochester, New York 14627
David Elmore
Affiliation:
Nuclear Structure Research Laboratory, University of Rochester Rochester, New York 14627
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Abstract

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We have measured the concentration of 36Cl in 67 samples from the upper portion of the Camp Century ice core. The profile extends from AD 1265 to 1865 and covers the times of the Wolf (AD 1282–1342), Spoerer (AD 1416–1534) and Maunder (AD 1645–1715) minima in sunspot number. Although the profile exhibits much short-term variation, a smoothed plot of the data shows a strong peak in 36Cl concentration over the time of the Maunder Minimum. The deeper part of the core suggests increased deposition of 36Cl over the periods of the Wolf and Spoerer minima. The time resolution of the profile is inadequate for testing for an 11-year periodicity in our data. The data augment evidence from 10Be and 14C studies which indicate solar modulation of radioisotope production. Since, however, much of the short-term variation of 36Cl seems to be independent of solar activity, other factors must affect the deposition of 36Cl in ice. These variations could be due in part to mechanisms affecting the transport of 36Cl in the atmosphere. Based on our data from Camp Century, we calculate an average input of 36Cl of 24 atoms/m2 sec.

Type
II. Carbon Cycle in the Environment
Information
Radiocarbon , Volume 31 , Issue 3: June 20-25, 1988 Dubrovnik, Yugoslavia , 1989 , pp. 585 - 591
Copyright
Copyright © The American Journal of Science 

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