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首页> 外文期刊>Environmental Science & Technology >Diel Changes in Trace Metal Concentration and Distribution in Coastal Waters: Catalina Island As a Study Case
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Diel Changes in Trace Metal Concentration and Distribution in Coastal Waters: Catalina Island As a Study Case

机译：沿海水体中痕量金属浓度和分布的Diel变化：以卡塔利娜岛为研究案例

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摘要

Understanding biogeochemical cycling of trace metals in the ocean requires information about variability in metal concentrations and distribution over short, e.g., diel, time scales. Such variability and the factors that influence it are poorly characterized. To address this shortcoming, we measured trace metal concentrations in the total dissolved, colloidal, and soluble fractions every 3-4 h for several consecutive days and nights in surface waters from a coastal station. Our results show that both the concentration and the size partitioning of some biologically essential (Fe, Cu, Co, and Cd) and anthropogenic (Pb) metals are subjected to diel variations that may be related to both inorganic and biological processes (e.g., photolysis of high-molecular- weight dissolved organic matter, photoinduced reduction/oxidation of metal(hydrous)oxides, uptake by growing phytoplankton, degradation of organic matter, lysis, and grazing). The largest fluctuations were observed in the soluble and colloidal pools. Soluble Fe varied during the day-night cycle by a factor of 40, and the contribution of colloidal Pb to the total dissolved fraction increased from 6 ± 3% during the day to as much as 70-80% during the night. Our results suggest that changes occurring over time scales of hours need to be considered when collecting and interpreting trace metal data from the surface ocean.
机译：要了解海洋中痕量金属的生物地球化学循环，就需要有关金属浓度变化和短时间（例如diel）时标分布的信息。此类可变性及其影响因素的特征不明确。为了解决这个缺点，我们连续几昼夜连续3-4天从沿海站点测量了总溶解，胶体和可溶部分中痕量金属的浓度，每3-4小时一次。我们的结果表明，某些生物学必需金属（Fe，Cu，Co和Cd）和人为（Pb）金属的浓度和尺寸分配都受到diel变异的影响，这可能与无机和生物过程（例如光解）有关高分子溶解有机物，光诱导的金属（水合）氧化物的还原/氧化，浮游植物生长引起的摄取，有机物的降解，裂解和放牧）。在可溶性和胶体池中观察到最大的波动。可溶性铁在昼夜循环中变化了40倍，胶体Pb对总溶解分数的贡献从白天的6±3％增加到夜晚的70-80％。我们的结果表明，在收集和解释来自表层海洋的痕量金属数据时，需要考虑在数小时的时间范围内发生的变化。

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  • 来源
    《Environmental Science & Technology》 |2014年第14期|7730-7737|共8页
  • 作者

    Paulina Pinedo-Gonzalez; A. Joshua West; Ignacio Rivera-Duarte; Sergio A. Sanudo-Wilhelmy;

  • 作者单位

    Department of Earth Sciences, University of Southern California, Los Angeles, California 90089-0740, United States;

    Department of Earth Sciences, University of Southern California, Los Angeles, California 90089-0740, United States;

    SPAWAR Systems Center Pacific, Code 71750, Environmental Analysis and Compliance, San Diego, California 92152-6343, United States;

    Department of Biological Sciences and Department of Earth Sciences, University of Southern California, Los Angeles, California 90089-0740, United States;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
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