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首页> 外文期刊>Marine Chemistry >Fe/Al ratios of suspended particulate matter from intermediate water in the Okhotsk Sea: Implications for long-distance lateral transport of particulate Fe
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Fe/Al ratios of suspended particulate matter from intermediate water in the Okhotsk Sea: Implications for long-distance lateral transport of particulate Fe

机译：鄂霍次克海中间水中悬浮颗粒物的Fe / Al比：对颗粒Fe的长距离横向传输的影响

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摘要

We have found that the ratio of Fe to Al in suspended particulate matter (SPM) in the intermediate layer of the Okhotsk Sea increases to the open ocean from the dense shelf water on the northwestern continental shelf, which is the source of southward-flowing Okhotsk Sea Intermediate Water (OSIW). The SPM concentration and the Al content of the SPM decrease along the course of the OSIW, whereas the ratios of Ba and Mn to Al increase. The SPM samples on the continental shelf were collected in waters characterized by low N~* (the deviation from the stoichiometric relationship between nitrogenous nutrients and phosphate). These low N~* values imply that sedimentary denitrification occurs on the continental shelf, and both Fe and Mn are concomitantly reduced in the sediments and diffuse from the sediments to the overlying waters, where they are subsequently oxidized and precipitate. We assume that the SPM in the intermediate layer is influenced mainly by horizontal transport from the continental shelf to the ocean interior and that Ba can be used as a proxy for organic matter. Based on these assumptions, the results could reflect the following processes: 1) a gradual loss of denser lithogenic matter, evidenced by the decreases of the SPM concentration and of the Al content of the SPM, and 2) a relative increase of the Fe and Mn fractions associated with the organic matter in the SPM, which is derived from the continental shelf. The organic matter-related Fe and Mn could also be affected by the precipitation of both Fe and Mn just above the reduced sediments of the continental shelf. Our results show that the particulate Fe associated with organic matter is preferentially transported from the northwestern continental shelf to the open ocean.
机译：我们已经发现，鄂霍次克海中间层中悬浮颗粒物（SPM）中的铁铝比从西北大陆架上密集的架子水向大洋处增加，这是鄂霍次克群岛向南流动的源头海洋中间水（OSIW）。随OSIW的过程，SPM的SPM浓度和Al含量降低，而Ba和Mn与Al的比例增加。大陆架上的SPM样品收集在N〜*低（含氮养分与磷酸盐之间的化学计量关系存在偏差）的水中。这些低的N〜*值意味着沉积物反硝化作用发生在大陆架上，铁和锰都随之在沉积物中还原，并从沉积物中扩散到上覆水域，随后被氧化和沉淀。我们假设中间层的SPM主要受从大陆架到海洋内部的水平运输的影响，Ba可以用作有机物的替代物。基于这些假设，结果可能反映出以下过程：1）致密成岩物质逐渐消失，这由SPM浓度和SPM中Al含量的降低证明，以及2）Fe和Fe的相对增加。与SPM中有机物相关的Mn馏分来自大陆架。与有机物有关的铁和锰也可能受大陆架减少沉积物正上方的铁和锰沉淀的影响。我们的结果表明，与有机物相关的颗粒状铁优先从西北大陆架运输到远洋。

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  • 来源
    《Marine Chemistry》 |2013年第20期|41-48|共8页
  • 作者

    Masahito Shigemitsu; J. Nishioka; Y.W. Watanabe; Y. Yamanaka; T. Nakatsuka; Y.N. Volkov;

  • 作者单位

    Faculty of Environmental Earth Science, Hokkaido University, Kita-10, Nishi-5, Kita-Ku, Sapporo 060-0810, Japan;

    Pan-Okhotsk Research Center, Institute of Low Temperature Science, Hokkaido University, Sapporo 060-0879, Japan;

    Faculty of Environmental Earth Science, Hokkaido University, Kita-10, Nishi-5, Kita-Ku, Sapporo 060-0810, Japan;

    Faculty of Environmental Earth Science, Hokkaido University, Kita-10, Nishi-5, Kita-Ku, Sapporo 060-0810, Japan;

    Department of Earth and Environmental Sciences, Graduate School of Environmental Studies, Nagoya University, Nagoya 464-8601, Japan;

    Far Eastern Regional Hydrometeorological Research Institute, Vladivostok, Russia;

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  • 正文语种 eng
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  • 关键词

    Suspended particulate matter; Particulate iron; Okhotsk Sea; Lateral transport;

    机译：悬浮颗粒物;颗粒铁;鄂霍次克海;横向运输;

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