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Anthropogenic Pu distribution in Tropical East Pacific

机译：热带东太平洋人为Pu分布

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摘要

The geographical distribution of the anthropogenic radionuclides ~(238)Pu and ~(239+240)pu in the Tropical East Pacific in 2003 was studied from the viewpoint of material migration. We measured the contents of Pu isotopes in seawater and in sediment from the sea bottom. The distributions of Pu isotopes, together with those of coexisting nitrate and phosphate species and dissolved oxygen, are discussed in relation to the potential temperature and potential density (sigma-6). The Pu contents in sediment samples were compared with those in the seawater. Horizontal migration across the Equator from north to south was investigated at depths down to -800 m in the eastern Pacific. The Pu distribution at 0-400 m correlated well with the distribution of potential temperature. Maximum Pu levels were observed in the subsurface layer at 600-800 m, corresponding to the depth where sigma-6 « 27.0. It is suggested that the Pu distribution depends on the structure of the water mass and the particular temperature and salinity. The water column/sediment column inventory ratio and the vertical distribution of Pu may reflect the efficiency of scavenging in the relevant water areas.
机译：从物质迁移的角度研究了2003年热带东太平洋人为放射性核素〜（238）Pu和〜（239 + 240）pu的地理分布。我们测量了海水和海底沉积物中的Pu同位素含量。讨论了Pu同位素的分布以及硝酸盐，磷酸盐和溶解氧的共存关系，并与势能温度和势能密度（sigma-6）有关。将沉积物样品中的Pu含量与海水中的Pu含量进行了比较。在东太平洋低至-800 m的深度调查了从北向南横贯赤道的水平偏移。 0-400 m处的Pu分布与势能温度分布密切相关。在600-800 m的地下层中观察到最大的Pu含量，对应于sigma-6«27.0处的深度。建议Pu的分布取决于水团的结构以及特定的温度和盐度。水柱/泥沙柱的存量比和Pu的垂直分布可能反映了在相关水域的清除效率。

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  • 来源
    《The Science of the Total Environment》 |2011年第10期|p.1889-1899|共11页
  • 作者

    Norikazu Kinoshita; Takahiro Sumi; Kiyotaka Takimoto; Mika Nagaoka; Akihiko Yokoyama; Takashi Nakanishi;

  • 作者单位

    Research Facility Center for Science and Technology, University of Tsukuba, 1-1-1 Ten-nodai, Tsukuba, Ibaraki 305-8577, Japan;

    Graduate School of Natural Science and Technology, Kanazawa University, Kakuma-machi, Kanazawa, Ishikawa 920-1192, Japan;

    Graduate School of Natural Science and Technology, Kanazawa University, Kakuma-machi, Kanazawa, Ishikawa 920-1192, Japan;

    Graduate School of Natural Science and Technology, Kanazawa University, Kakuma-machi, Kanazawa, Ishikawa 920-1192, Japan;

    Institute of Science and Engineering, Kanazawa University, Kakuma-machi, Kanazawa, Ishikawa 920-1192, Japan;

    Institute of Science and Engineering, Kanazawa University, Kakuma-machi, Kanazawa, Ishikawa 920-1192, Japan;

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  • 正文语种 eng
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  • 关键词

    plutonium isotopes; seawater; sea sediment; geographical distribution; tropical east pacific;

    机译：is同位素海水;海底沉积物地理分布;热带东太平洋;

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