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首页> 外文期刊>Marine Chemistry >Evaluation of surface water mixing and associated nutrient fluxes in the East China Sea using ~(226)Ra and ~(228)Ra
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Evaluation of surface water mixing and associated nutrient fluxes in the East China Sea using ~(226)Ra and ~(228)Ra

机译：用〜（226）Ra和〜（228）Ra评价东海地表水混合及相关养分通量

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摘要

Advection and diffusion are recognized as two important processes in the mixing and exchange of coastal waters and associated nutrients. In this study, Ra isotopes (~(226)Ra and ~(228)Ra) are surveyed in the East China Sea (ECS) to investigate the advection and diffusion processes. Both one-dimensional (ID) and two-dimensional (2D) advection-diffusion models are applied to estimate the cross-shore and along-shore eddy diffusivities and advection velocities. The advection velocity is basically small in magnitude, suggesting its secondary role in transport. The cross-shore 1D model gives promising results on the diffusivity by 4.93×10~5 cm~2 s~(-1) Sensitivity analysis shows that the cross-shore diffusivity is less sensitive whereas the along-shore diffusivity is quite sensitive to advection velocity. Introducing benthic Ra flux in the model decreases the eddy diffusivity. A quisi-2D method generates an along-shore diffusivity by 2.50×10~7 cm~2 s~(-1) which is within the sensitivity range thus reliable. Based on the estimated diffusivity and advection velocities, we calculate the offshore nutrient fluxes (mol m~(-2) d~(-1)) by 0.44 for dissolved inorganic nitrogen (DIN), 0.012 for dissolved inorganic phosphorous (DIP) and 0.26 for dissolved inorganic silicates (DSi). The along-shore fluxes (mol m~(-2) d~(-1)) are 6.44 for DIN, 0.10 for DIP and 2.92 for DSi. Compared with nutrient inputs from other sources, e.g. river, sediments, and ocean, the horizontal mixing-derived nutrient fluxes contribute only ＜4% N, ＜ 1% P and ＜2% Si to the nutrient requirements for primary productivity in the study area. This study stresses the role of advection and diffusion in the material transport, i.e. nutrients and stoichiometry in the ECS.
机译：对流和扩散被认为是沿海水域及相关养分混合与交换的两个重要过程。在这项研究中，对Ra同位素（〜（226）Ra和〜（228）Ra）在东海（ECS）进行了调查，以研究对流和扩散过程。一维（ID）和二维（2D）对流扩散模型均用于估计跨岸和沿岸涡流扩散率和对流速度。对流速度基本上很小，表明其在运输中具有次要作用。跨岸一维模型在4.93×10〜5 cm〜2 s〜（-1）的扩散率方面给出了可喜的结果。灵敏度分析表明，跨岸扩散率对平流度较不敏感速度。在模型中引入底栖Ra通量会降低涡流扩散率。二维二维方法产生的沿岸扩散系数为2.50×10〜7 cm〜2 s〜（-1），处于可靠的灵敏度范围内。根据估算的扩散率和对流速度，我们通过溶解无机氮（DIN）的0.44，溶解无机磷（DIP）的0.012和0.26计算离岸养分通量（mol m〜（-2）d〜（-1））。用于溶解的无机硅酸盐（DSi）。 DIN的沿岸通量（mol m〜（-2）d〜（-1））为6.44，DIP为0.10，DSi为2.92。与其他来源的营养投入相比，例如在河流，沉积物和海洋中，水平混合的养分通量仅对研究区初级生产力的养分需求贡献了不足4％的氮，不足1％的磷和不足2％的硅。这项研究强调了对流和扩散在物质运输中的作用，即ECS中的养分和化学计量。

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  • 来源
    《Marine Chemistry》 |2013年第20期|108-119|共12页
  • 作者

    Ni Su; Jinzhou Du; Ying Li; Jing Zhang;

  • 作者单位

    State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, PR China;

    State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, PR China;

    State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, PR China;

    State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, PR China;

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  • 正文语种 eng
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  • 关键词

    Radium; Eddy diffusivity; Advection velocity; Nutrient fluxes; East China Sea;

    机译：镭;涡流扩散对流速度营养通量;东海;

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