globalchange  > 气候减缓与适应
DOI: 10.1002/2017JC013678
Scopus记录号: 2-s2.0-85045951279
论文题名:
Bomb-14C Peak in the North Pacific Recorded in Long-Lived Bivalve Shells (Mercenaria stimpsoni)
作者: Kubota K.; Shirai K.; Murakami-Sugihara N.; Seike K.; Minami M.; Nakamura T.; Tanabe K.
刊名: Journal of Geophysical Research: Oceans
ISSN: 21699275
出版年: 2018
卷: 123, 期:4
起始页码: 2867
结束页码: 2881
语种: 英语
英文关键词: bivalve ; bomb-14C peak ; Japan ; Mercenaria ; radiocarbon ; sclerochronology
Scopus关键词: Anthozoa ; Bivalvia ; Mercenaria
英文摘要: The excess radiocarbon produced by nuclear bomb testing in the atmosphere in the 1950s–1960s (bomb-14C) is used as a tracer in the surface ocean, extending our understanding of geophysics and biogeochemical cycles. However, there is no bomb-14C record for the high-latitude western North Pacific Ocean because of the paucity of long-lived marine calcifying organisms equivalent to reef-building corals. The shells of Stimpson's hard clam, Mercenaria stimpsoni, potentially provide such a record because the clam's lifespan is very long (>100 years). We analyzed 14C in six live-caught M. stimpsoni shells from the western North Pacific (39.4°N, 142°E) and report, for the first time, the bomb-14C record with robust calendar ages based on annual growth increments. The value was constant in 1934–1952 (Δ14C = −66‰), with a sudden increase in 1959, a peak in 1974 (107‰), which was 60‰ lower than that of the Kuroshio Current, a gradual decline after 1974, and a current value of 16–18‰, which is ∼10‰ higher than the atmospheric value. The bomb-14C values are between the Kuroshio Current (the northwestern subtropical gyre) and Oyashio Current (the Western Subarctic Gyre) values, suggesting that the Tsugaru Current, downstream from the Kuroshio Current, mixes with the Oyashio Current after passing through Tsugaru Strait. © 2018. American Geophysical Union. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114216
Appears in Collections:气候减缓与适应

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作者单位: Kochi Institute for Core Sample Research, Japan Agency for Marine-Earth Science and Technology, Nankoku, Japan; Atmosphere and Ocean Research Institute, University of Tokyo, Chiba, Japan; Institute for Space-Earth Environmental Research, Nagoya University, Furo-cho, Nagoya, Japan; Now at Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology, Tsukuba, Japan; Department of Earth and Planetary Science, University of Tokyo, Bunkyo, Japan

Recommended Citation:
Kubota K.,Shirai K.,Murakami-Sugihara N.,et al. Bomb-14C Peak in the North Pacific Recorded in Long-Lived Bivalve Shells (Mercenaria stimpsoni)[J]. Journal of Geophysical Research: Oceans,2018-01-01,123(4)
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