Bomb-Produced 14 C in Tree Rings
The 14 C 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), Δ 14 C values rose dramatically from 250‰ in 1961 to a maximum 909‰ in 1964, and then gradually...
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Cambridge University Press (CUP)
1992
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Online Access: | http://dx.doi.org/10.1017/s0033822200064043 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033822200064043 |
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crcambridgeupr:10.1017/s0033822200064043 2024-03-03T08:47:34+00:00 Bomb-Produced 14 C in Tree Rings Kaimei, Dai Youneng, Qian Fan, C. Y. 1992 http://dx.doi.org/10.1017/s0033822200064043 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033822200064043 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Radiocarbon volume 34, issue 3, page 753-756 ISSN 0033-8222 1945-5755 General Earth and Planetary Sciences Archeology journal-article 1992 crcambridgeupr https://doi.org/10.1017/s0033822200064043 2024-02-08T08:30:57Z The 14 C 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), Δ 14 C values rose dramatically from 250‰ in 1961 to a maximum 909‰ in 1964, and then gradually decreased to 238‰ in 1983. We compared Δ 14 C 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 Δ 14 C values in both northern and southern hemispheres. We observe that: 1) annual tree rings grown in the same latitude zone have the same Δ 14 C values, reflecting rapid longitudinal mixing of the atmosphere; 2) atmospheric 14 C concentrations reached a global equilibrium distribution at the end of 1968, and tree ring 14 C content reflects atmospheric 14 C concentration; 3) 1976–1982 rings of the Dailing spruce show excessive 14 C, likely due to the effect of 1976 and 1980 Chinese bomb tests; 4) Δ 14 C decreases exponentially, halving every 17 yr. Article in Journal/Newspaper Novaya Zemlya Cambridge University Press Radiocarbon 34 3 753 756 |
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Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
General Earth and Planetary Sciences Archeology |
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General Earth and Planetary Sciences Archeology Kaimei, Dai Youneng, Qian Fan, C. Y. Bomb-Produced 14 C in Tree Rings |
topic_facet |
General Earth and Planetary Sciences Archeology |
description |
The 14 C 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), Δ 14 C values rose dramatically from 250‰ in 1961 to a maximum 909‰ in 1964, and then gradually decreased to 238‰ in 1983. We compared Δ 14 C 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 Δ 14 C values in both northern and southern hemispheres. We observe that: 1) annual tree rings grown in the same latitude zone have the same Δ 14 C values, reflecting rapid longitudinal mixing of the atmosphere; 2) atmospheric 14 C concentrations reached a global equilibrium distribution at the end of 1968, and tree ring 14 C content reflects atmospheric 14 C concentration; 3) 1976–1982 rings of the Dailing spruce show excessive 14 C, likely due to the effect of 1976 and 1980 Chinese bomb tests; 4) Δ 14 C decreases exponentially, halving every 17 yr. |
format |
Article in Journal/Newspaper |
author |
Kaimei, Dai Youneng, Qian Fan, C. Y. |
author_facet |
Kaimei, Dai Youneng, Qian Fan, C. Y. |
author_sort |
Kaimei, Dai |
title |
Bomb-Produced 14 C in Tree Rings |
title_short |
Bomb-Produced 14 C in Tree Rings |
title_full |
Bomb-Produced 14 C in Tree Rings |
title_fullStr |
Bomb-Produced 14 C in Tree Rings |
title_full_unstemmed |
Bomb-Produced 14 C in Tree Rings |
title_sort |
bomb-produced 14 c in tree rings |
publisher |
Cambridge University Press (CUP) |
publishDate |
1992 |
url |
http://dx.doi.org/10.1017/s0033822200064043 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033822200064043 |
genre |
Novaya Zemlya |
genre_facet |
Novaya Zemlya |
op_source |
Radiocarbon volume 34, issue 3, page 753-756 ISSN 0033-8222 1945-5755 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0033822200064043 |
container_title |
Radiocarbon |
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34 |
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3 |
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753 |
op_container_end_page |
756 |
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1792503779877191680 |