Anthropogenic 129I in the sediment cores in the East China sea: Sources and transport pathways

Xue Zhao, Xiaolin Hou*, Jinzhou Du, Yukun Fan

*Corresponding author for this work

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    With the increased numbers of nuclear power plants constructed along the east coast of China, it is important to know radioactive sources and transport pathways between land and sea, in order to better understand the impact of these nuclear facilities to the marine environment. Two sediment cores collected from the East China Sea dated to 1959–2010 were analyzed for long-lived radioactive 129I and stable 127I. It was observed that 129I levels (129I/127I ratio of (15.0–75.0) × 10−12) were significantly increased compared to the pre-nuclear value (129I/127I = 1.5 × 10−12). Some 129I peaks were observed in layers of 1959, 1966, 1971 and 1976 (1977), corresponding to the atmospheric nuclear weapon tests at Pacific Proving Grounds and Lop Nor. The high values of 129I after the late 1970s are attributed to the releases from the European reprocessing plants. In addition to ocean current transport, the atmospheric dispersion through the interaction of the Westerlies with East Asia monsoon is the important pathway of large-scale transport of pollutants from high latitude West Europe to middle latitude East Asia. Riverine input is the main transport pathway of radioactive pollutants released from Lop Nor to the East China Sea through the atmospheric dispersion, deposition and runoff processes. The sources and transport pathway of anthropogenic 129I in the ECS was investigated to estimate the impact of the human nuclear activities to the marine ecosystem in the east China sea and to improve the understanding of pollutant dispersion.

    Original languageEnglish
    JournalEnvironmental Pollution
    Volume245
    Pages (from-to)443-452
    ISSN0269-7491
    DOIs
    Publication statusPublished - 2019

    Keywords

    • Environmental dispersion
    • Human nuclear activities
    • Iodine-129
    • Lop Nor
    • Sediment

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