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Bomb-Produced 14C in Tree Rings

Published online by Cambridge University Press:  18 July 2016

Dai Kaimei ,
Qian Youneng  and
C. Y. Fan
Dai Kaimei
Affiliation:
Department of Physics, Nanjing University, Nanjing, China
Qian Youneng
Affiliation:
Department of Physics, Nanjing University, Nanjing, China
C. Y. Fan
Affiliation:
Department of Physics, The University of Arizona, Tucson, Arizona 85721 USA
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Abstract

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The 14C content in 1961–1967 and 1970–1983 tree rings of a spruce grown in Dailing, China (47°N, 129°E) was measured by liquid scintillation. As a result of USSR bomb tests at Novaya Zemlya (72°N, 53°E), Δ14C values rose dramatically from 250‰ in 1961 to a maximum 909‰ in 1964, and then gradually decreased to 238‰ in 1983. We compared Δ14C values in the rings of an oak tree grown at 43°N, 74°W and that of a pine grown at 49°N, 9°E, and atmospheric Δ14C values in both northern and southern hemispheres. We observe that: 1) annual tree rings grown in the same latitude zone have the same Δ14C values, reflecting rapid longitudinal mixing of the atmosphere; 2) atmospheric 14C concentrations reached a global equilibrium distribution at the end of 1968, and tree ring 14C content reflects atmospheric 14C concentration; 3) 1976–1982 rings of the Dailing spruce show excessive 14C, likely due to the effect of 1976 and 1980 Chinese bomb tests; 4) Δ14C decreases exponentially, halving every 17 yr.

Type
III. Global 14C Production and Variation
Information
Radiocarbon , Volume 34 , Issue 3: Proceedings of the 14th International Radiocarbon Conference , 1992 , pp. 753 - 756
Copyright
Copyright © The American Journal of Science 

References

Burchuladze, A. A., Chudý, M., Eristavi, I. V., Pagava, S. V., Povinec, P., Šivo, A. and Togonidze, G. I. 1989 Anthropogenic 14C variations in atmospheric CO2 and wines, In Long, A. and Kra, R. S., eds., Proceedings of the 13th International 14C Conference. Radiocarbon 31(3): 771–776.Google Scholar
Cain, W. F. and Suess, H. E. 1976 Carbon 14 in tree rings. Journal of Geophysical Research 81: 3688–3694.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., Proceedings of the 12th International 14C Conference. Radiocarbon 28(2A): 346–349.CrossRefGoogle Scholar
Levin, I., Kromer, B., Schoch-Fischer, H., Bruns, M., Münnich, M., Berdau, D., Vogel, J. C. and Münnich, K. O. 1985 25 years of tropospheric 14C observations in central Europe. Radiocarbon 27(1): 1–19.Google Scholar
Manning, M. R., Lowe, D. C., Melhuish, W. H., Sparks, R. J., Wallace, G., Brenninkmeijer, C. A. M. and McGill, R. C. 1990 The use of radiocarbon measurements in atmospheric studies. Radiocarbon 32(1): 37–58.Google Scholar
Nakamura, T., Nakai, N. and Ohishi, S. 1987 Applications of environmental 14C measured as a carbon tracer. In Gove, H. E., Litherland, A. E. and Elmore, D., eds., Proceedings of the 4th International Symposium on Accelerator Mass Spectrometry. Nuclear Instruments and Methods in Physics Research B29: 355–360.CrossRefGoogle Scholar
Sowl, R. E., Gray, J. Jr., Ashenfelter, T. E. and Telegadas, K. 1975 Carbon-14 measurements in the stratosphere from a balloon-borne molecular sieve sampler. US Atomic Energy Commission Report HASL-294.Google Scholar
Telegadas, K. 1971 The seasonal atmospheric distribution and inventories of excess carbon-14 from March 1955 to July 1969. US Atomic Energy Commission Report HASL-243.Google Scholar