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

We have measured the concentration of 36 Cl 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 ex...

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Bibliographic Details
Published in:Radiocarbon
Main Authors: Conard, N J, Kubik, P W, Gove, H E, Elmore, David
Format: Article in Journal/Newspaper
Language:English
Published: Cambridge University Press (CUP) 1989
Subjects:
General Earth and Planetary Sciences
Archeology
Greenland
Strong Peak
ice core
Online Access:http://dx.doi.org/10.1017/s0033822200012170
https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033822200012170
Description
Summary:We have measured the concentration of 36 Cl 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 36 Cl concentration over the time of the Maunder Minimum. The deeper part of the core suggests increased deposition of 36 Cl 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 10 Be and 14 C studies which indicate solar modulation of radioisotope production. Since, however, much of the short-term variation of 36 Cl seems to be independent of solar activity, other factors must affect the deposition of 36 Cl in ice. These variations could be due in part to mechanisms affecting the transport of 36 Cl in the atmosphere. Based on our data from Camp Century, we calculate an average input of 36 Cl of 24 atoms/m 2 sec.

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