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Bomb Produced 14C Content in Tree Rings Grown at Different Latitudes

Published online by Cambridge University Press:  18 July 2016

Kai-Mei Dai  and
C Y Fan
Kai-Mei Dai
Affiliation:
Department of Physics, Nanjing University, Nanjing, China
C Y Fan
Affiliation:
Department of Physics, Nanjing University, Nanjing, China
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Abstract

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The 14C content in 1961–1967 rings of each of three spruce pines grown at (68° N, 130° W), (47° 30' N, 129° 16' E) and (27° 13' N, 100° 20' E) were measured. Δ14C values of the three specimens rise dramatically from a common level (∼250‰) in 1961 to their respective maxima, 964‰, 909‰, and 743‰ in 1964 and then fall to a common level ∼680‰ in 1967. The observed Δ14C increase comes most likely from the nuclear bomb test of the USSR at 75° N in 1961, although there were many other tests since the 1950s. The different effects at different latitudes reflect the atmospheric circulation patterns in the stratosphere and the transport of 14C nuclei from the stratosphere to the troposphere.

Type
III. The Carbon Cycle
Information
Radiocarbon , Volume 28 , Issue 2A , 1986 , pp. 346 - 349
Copyright
Copyright © The American Journal of Science 

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