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Radiocarbon Activity Variation in Dated Tree Rings Grown in Mackenzie Delta

Published online by Cambridge University Press:  18 July 2016

C Y Fan
Affiliation:
Department of Physics, University of Arizona, Tucson
Chen Tie-Mei
Affiliation:
Radiocarbon Laboratory, Archaeological Section, History Department Peking University, Beijing, China
Yun Si-Xun
Affiliation:
Radiocarbon Laboratory, Archaeological Section, History Department Peking University, Beijing, China
Dai Kai-Mei
Affiliation:
Department of Physics, Nanjing University, Nanjing, China
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Abstract

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We measured the Δ14C values in 57 rings (from AD 1824 to 1880) of a white spruce grown in Mackenzie Delta (68°N, 130°W), as part of our continuing study of the Δ14C variation related to solar activities. The values exhibit a 10‰ fluctuation with an 11-year periodicity anti-correlated with the solar activity cycle. We also measured the Δ14C values in 6 rings (from AD 1940 to 1945). The abnormally high value in the 1943 ring may be due to two large solar flares occurring in 1942.

Type
II. Natural Variations
Copyright
Copyright © The American Journal of Science 

References

Baxter, M S and Farmer, J G, 1973, Radiocarbon: Short term variations: Earth Planetary Sci Letters, v 20, p 295299.Google Scholar
Burchuladze, A A, Pagava, S V, Povinec, P, Togonidze, G I & Usacev, S, 1980, Radiocarbon variations with the 11-year solar cycle during the last century: Nature, v 287, p 320322.Google Scholar
Damon, P E, Long, A & Wallick, E I, 1973, On the magnitude of the 11-year radiocarbon cycle: Earth Planetary Sci Letters, v 20, p 300306.Google Scholar
Dai, K M and Fan, C Y, 1986, Bomb-produced 14C content in tree rings grown at different latitudes, in Stuiver, M and Kra, R S eds, Internatl 14C conf, 12th, Proc: Radiocarbon, this issue.Google Scholar
Fairhall, A W and Young, J A, 1970, Radiocarbon in the environment: Advances in chemistry series, no. 93, Radionuclides in the environment, p 401418.Google Scholar
Fan, C Y, Chen, T M, Yun, S X and Dai, K M, 1983, Radiocarbon activity variation in dated tree rings grown in Mackenzie Delta, in Stuiver, M and Kra, R S, eds, Internatl 14C conf, 11th, Proc: Radiocarbon, v 25, no 2, p 205212.Google Scholar
Forbush, S E, 1946, Three unusual cosmic-ray increases possibly due to charged particles from the sun: Physical Rev, v 70, p 771772.Google Scholar
Lingenfelter, R E and Ramaty, R, 1970, Astrophysical and geophysical variations in C14 production, in Olsson, I U, ed, Radiocarbon variations and absolute chronology: New York, John Wiley & Sons, p 513537.Google Scholar
Stuiver, M and Quay, P D, 1980, Changes in atmospheric carbon-14 attributed to a variable sun: Science, v 207, p 1119.Google Scholar
Povinec, P, 1983, Comparison of data on Δ14C variations with the 11-yr solar cycle as obtained by different groups, in Stuiver, M and Kra, R S, eds, Internatl 14C conf, 11th, Proc: Radiocarbon v 25, no. 2, p 259266.Google Scholar
Suess, H E, 1965, Secular variations of the cosmic ray produced carbon-14 in the atmosphere and their interpretations: Jour Geophys Research, v 70, p 59375952.Google Scholar
Tans, P P, DeJong, A F and Mook, W G, 1979, Natural atmospheric 14C variation and the Suess effect: Nature, v 280, p 826828.CrossRefGoogle Scholar