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首页> 外文期刊>Marine Chemistry >Dissolved manganese and silicic acid in the Columbia River plume: A major source to the California current and coastal waters off Washington and Oregon
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Dissolved manganese and silicic acid in the Columbia River plume: A major source to the California current and coastal waters off Washington and Oregon

机译：哥伦比亚河羽流中溶解的锰和硅酸：是华盛顿州和俄勒冈州附近加州水域和沿海水域的主要来源

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The spatial distributions of dissolved manganese and nutrients were examined in the Columbia River plume off Oregon and Washington during the summer of 2004 and 2005 as part of the River Influence on Shelf Ecosystems (RISE) program. Factors influencing the hydrochemical characteristics of the freshly formed and aged Columbia River plume were investigated. Hydrographic data and nutrient concentrations were used to delineate three distinct water sources for the Columbia River Plume: California Current surface water, coastal upwelled water, and Columbia River water. The warm, intermediate salinity, nutrient poor California Current water contains low levels of dissolved manganese ( < 5 nM) and silicic acid ( < 5 μM), and is depleted in nitrate. The cold, high salinity, nutrient rich, freshly upwelled water is highly variable (2-20 nM) in dissolved manganese and can be as high as ～ 45 μM in silicic acid and ～ 30 μM nitrate. The variable Columbia River has summer temperatures ranging from ～ 13 to 24℃, high silicic acid concentrations (ranging from ～ 120 to 200 μM), and lower nitrate concentrations (ranging from ～ 2 to 20 μM). During the summer, the concentrations of silicic acid and dissolved manganese can exceed 100 μM and 200 nM, respectively, in near-field Columbia River plumes. These values are markedly greater than those of surface coastal waters (even during upwelling conditions). As the plume advects and mixes, the concentrations of these two constituents remain relatively high within plume waters. The concentrations of dissolved manganese in the near-field plume vary with tidal amplitude, exhibiting much higher concentrations for a given salinity during spring tides than during neap tides. For example, the Columbia River plume at a salinity of 20 has a concentration of dissolved manganese of ～ 240 nM during spring tides, as compared to only ～ 60 nM during low amplitude tides. Silicic acid concentrations in the near-field plume remain relatively constant throughout the tidal month. Calculations indicate there is roughly an equivalent yearly delivery of dissolved manganese and silicic acid to the coastal waters off Oregon and Washington by upwelled waters and by the Columbia River plume.
机译：作为河流对架子生态系统影响（RISE）计划的一部分，在2004年夏季和2005年夏季，对俄勒冈州和华盛顿附近的哥伦比亚河羽流中的溶解锰和养分的空间分布进行了检查。研究了影响刚形成和老化的哥伦比亚河羽流的水化学特征的因素。水文数据和营养物浓度用于描绘哥伦比亚河羽的三种不同水源：加利福尼亚州当前的地表水，沿海上升水和哥伦比亚河水。温暖，中度盐分，营养不良的加利福尼亚州加利福尼亚州的水中溶解的锰（<5 nM）和硅酸（<5μM）含量低，并且富含硝酸盐。寒冷，高盐度，营养丰富，新鲜涌出的水在溶解的锰中变化很大（2-20 nM），在硅酸和硝酸盐中可能高达〜45μM。可变的哥伦比亚河的夏季温度范围为〜13至24℃，硅酸浓度较高（范围为〜120至200μM），硝酸盐浓度较低（范围为〜2至20μM）。在夏季，在近场的哥伦比亚河羽流中，硅酸和溶解的锰的浓度可能分别超过100μM和200 nM。这些值明显大于地表沿海水域的值（即使在上升流条件下）。随着羽流的平移和混合，羽流中这两种成分的浓度仍然相对较高。近场羽流中溶解的锰浓度随潮汐幅度而变化，在春季潮汐中，给定盐度的浓度要比在潮汐潮汐中高得多。例如，盐度为20的哥伦比亚河羽流在春季潮汐中的溶解锰浓度约为240 nM，而在低潮汐潮汐中的溶解锰浓度仅为60 nM。在整个潮汐月份，近场羽流中的硅酸浓度保持相对恒定。计算表明，上升的水域和哥伦比亚河的羽流每年向俄勒冈州和华盛顿州附近的沿海水域输送溶解的锰和硅酸大约相当。

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