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<p>In this study, the long-term variation in <sup>137</sup>Cs in surface water of the southern Philippine Sea (SPS) was reconstructed. Owing to the influence of local fallout, significantly high levels of <sup>137</sup>Cs emerged during the late 1950s. Afterward, <sup>137</sup>Cs in SPS surface water decreased exponentially from 1965 to 2010, with an effective half-life of 14.0 ± 0.7&#xa0;years. Since 2011, the <sup>137</sup>Cs activity concentration in SPS surface water has increased slightly, which could be a consequence of the arrival of Fukushima-derived <sup>137</sup>Cs into the SPS entrained by the ocean current in the subtropical gyre. However, more observational data are needed in this regard.</p>

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137Cs in surface water of the Southern Philippine Sea: historical changes and environmental implications

  • 期刊论文

  • 发表日期：

    2025年12月6日

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  • Siyin Ke,
  • Qiangqiang Zhong,
  • Yasong Wang,
  • Bilin Liu,
  • Dekun Huang,
  • Fule Zhang,
  • Yunping Xu,
  • Tao Yu

摘要

In this study, the long-term variation in 137Cs in surface water of the southern Philippine Sea (SPS) was reconstructed. Owing to the influence of local fallout, significantly high levels of 137Cs emerged during the late 1950s. Afterward, 137Cs in SPS surface water decreased exponentially from 1965 to 2010, with an effective half-life of 14.0 ± 0.7 years. Since 2011, the 137Cs activity concentration in SPS surface water has increased slightly, which could be a consequence of the arrival of Fukushima-derived 137Cs into the SPS entrained by the ocean current in the subtropical gyre. However, more observational data are needed in this regard.