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Reconstructing surface ocean circulation with 129I time series recordsfrom corals
Chang,CC(Chang,Ching-Chih)[1,2]; Burr, G S(Burr, George S)[1,3]; Jull,A.J.Timothy [1,2]; Russell,J L(Russell,Joellen L.)[2]; Biddulph,D(Biddulph, Dana)[1]; White,L(White,Lara)[1]; Prouty, N G.(Prouty, Nancy G.)[4]; Chen,YG(Chen,Yue-Gau)[5]; Shen,CC(Shen,Chuan-Chou)[5]; Zhou,WJ(Zhou,Weijian)[6]; Lam,DD(Lam,Doan Dinh)[7]
Source PublicationJournal of Environmental Radioactivity

The long-lived radionuclide 129I (half-life: 15.7 × 106 yr) is well-known as a useful environmental tracer. At present, the global 129I in surface water is about 1–2 orders of magnitude higher than pre-1960 levels. Since the 1990s, anthropogenic 129I produced from industrial nuclear fuels reprocessing plants has been the primary source of 129I in marine surface waters of the Atlantic and around the globe. Here we present four coral 129I time series records from: 1) Con Dao and 2) Xisha Islands, the South China Sea, 3) Rabaul, Papua New Guinea and 4) Guam. The Con Dao coral 129I record features a sudden increase in 129I in 1959. The Xisha coral shows similar peak values for 129I as the Con Dao coral, punctuated by distinct low values, likely due to the upwelling in the central South China Sea. The Rabaul coral features much more gradual 129I increases in the 1970s, similar to a published record from the Solomon Islands. The Guam coral 129I record contains the largest measured values for any site, with two large peaks, in 1955 and 1959. Nuclear weapons testing was the primary 129I source in the Western Pacific in the latter part of the 20th Century, notably from testing in the Marshall Islands. The Guam 1955 peak and Con Dao 1959 increases are likely from the 1954 Castle Bravo test, and the Operation Hardtack I test is the most likely source of the 1959 peak observed at Guam. Radiogenic iodine found in coral was carried primarily through surface ocean currents. The coral 129I time series data provide a broad picture of the surface distribution and depth penetration of 129I in the Pacific Ocean over the past 60 years.

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Document Type期刊论文
Affiliation1.NSF-Arizona AMS Laboratory, University of Arizona, Tucson, AZ 85721, USA;
2.Department of Geosciences, University of Arizona, Tucson, AZ 85721, USA;
3.Department of Oceanography, National Sun Yat-Sen University, Kaohsiung, Taiwan;
4.US Geological Survey Pacific Coastal & Marine Science Center, Santa Cruz, CA 95060, USA;
5.Department of Geosciences, National Taiwan University, Taipei, Taiwan;
6.Shaanxi Province Key Laboratory of Accelerator Mass Spectrometry Technology and Application, Institute of Earth Environment, CAS, Xi'an 710043, China;
7.Institute of Geology, Vietnamese Academy of Science and Technology, Hanoi, Viet Nam
Recommended Citation
GB/T 7714
Chang,CC,Burr, G S,Jull,A.J.Timothy [1,2],et al. Reconstructing surface ocean circulation with 129I time series recordsfrom corals[J]. Journal of Environmental Radioactivity,2016,165(2016):144-150.
APA Chang,CC.,Burr, G S.,Jull,A.J.Timothy [1,2].,Russell,J L.,Biddulph,D.,...&Lam,DD.(2016).Reconstructing surface ocean circulation with 129I time series recordsfrom corals.Journal of Environmental Radioactivity,165(2016),144-150.
MLA Chang,CC,et al."Reconstructing surface ocean circulation with 129I time series recordsfrom corals".Journal of Environmental Radioactivity 165.2016(2016):144-150.
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