Bomb-Produced 14C in Tree Rings
The 14C content in 1961-1967 and 1970-1983 tree rings of a spruce grown in Dailing, China (47N, 129E) was measured by liquid scintillation. As a result of USSR bomb tests at Novaya Zemlya (72N, 53E), ∆14C values rose dramatic ally from 250 in 1961 to a maximum 909 in 1964, and then gradually decreas...
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Radiocarbon
1992
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ftunivarizonaojs:oai:journals.uair.arizona.edu:article/1526 2023-05-15T17:47:14+02:00 Bomb-Produced 14C in Tree Rings Kaimei, Dai Youneng, Qian Fan, C. V. 1992-01-01 application/pdf https://journals.uair.arizona.edu/index.php/radiocarbon/article/view/1526 eng eng Radiocarbon https://journals.uair.arizona.edu/index.php/radiocarbon/article/view/1526/1530 https://journals.uair.arizona.edu/index.php/radiocarbon/article/view/1526 Radiocarbon; Vol 34, No 3 (1992); 753-756 0033-8222 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article 1992 ftunivarizonaojs 2020-11-14T17:53:01Z The 14C content in 1961-1967 and 1970-1983 tree rings of a spruce grown in Dailing, China (47N, 129E) was measured by liquid scintillation. As a result of USSR bomb tests at Novaya Zemlya (72N, 53E), ∆14C values rose dramatic ally from 250 in 1961 to a maximum 909 in 1964, and then gradually decreased to 238 in 1983. We compared ∆14C values in the rings of an oak tree grown at 43N, 74W and that of a pine grown at 49N, 9E, and atmospheric ∆14C values in both northern and southern hemispheres. We observe that: 1) annual tree rings grown in the same latitude zone have the same ∆14C 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) ∆14C decreases exponentially, halving every 17 yr. Article in Journal/Newspaper Novaya Zemlya Journals at the University of Arizona |
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Open Polar |
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Journals at the University of Arizona |
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ftunivarizonaojs |
language |
English |
description |
The 14C content in 1961-1967 and 1970-1983 tree rings of a spruce grown in Dailing, China (47N, 129E) was measured by liquid scintillation. As a result of USSR bomb tests at Novaya Zemlya (72N, 53E), ∆14C values rose dramatic ally from 250 in 1961 to a maximum 909 in 1964, and then gradually decreased to 238 in 1983. We compared ∆14C values in the rings of an oak tree grown at 43N, 74W and that of a pine grown at 49N, 9E, and atmospheric ∆14C values in both northern and southern hemispheres. We observe that: 1) annual tree rings grown in the same latitude zone have the same ∆14C 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) ∆14C decreases exponentially, halving every 17 yr. |
format |
Article in Journal/Newspaper |
author |
Kaimei, Dai Youneng, Qian Fan, C. V. |
spellingShingle |
Kaimei, Dai Youneng, Qian Fan, C. V. Bomb-Produced 14C in Tree Rings |
author_facet |
Kaimei, Dai Youneng, Qian Fan, C. V. |
author_sort |
Kaimei, Dai |
title |
Bomb-Produced 14C in Tree Rings |
title_short |
Bomb-Produced 14C in Tree Rings |
title_full |
Bomb-Produced 14C in Tree Rings |
title_fullStr |
Bomb-Produced 14C in Tree Rings |
title_full_unstemmed |
Bomb-Produced 14C in Tree Rings |
title_sort |
bomb-produced 14c in tree rings |
publisher |
Radiocarbon |
publishDate |
1992 |
url |
https://journals.uair.arizona.edu/index.php/radiocarbon/article/view/1526 |
genre |
Novaya Zemlya |
genre_facet |
Novaya Zemlya |
op_source |
Radiocarbon; Vol 34, No 3 (1992); 753-756 0033-8222 |
op_relation |
https://journals.uair.arizona.edu/index.php/radiocarbon/article/view/1526/1530 https://journals.uair.arizona.edu/index.php/radiocarbon/article/view/1526 |
_version_ |
1766151600365109248 |