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Boron to salinity ratios for Atlantic, Arctic and Polar Waters: A view from downstream

机译：硼至大西洋，北极和极地水域的盐度比率：从下游的景色

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摘要

Discharges of freshwater into the Arctic Ocean from rivers in Eurasia and North America account for approximately 11% of the global riverine freshwater input, and contain weathering products including dissolved continental boron. Much of this freshwater flows into the North Atlantic Ocean, primarily via the East Greenland Current carrying the Polar Water with salinity 34.4. As a result, the input of boron-containing freshwater could cause the boron content in low salinity water to deviate from predictions based on the open ocean ratio for boron to salinity. Significant deviations from predictions would affect carbonate system calculations for seawater in the Arctic. We analysed the boron concentrations and salinity for seawater samples (n = 249; salinity = 30-35) collected primarily from the areas of the East Greenland Current downstream of the influence of freshwater inputs, and from northward flowing Atlantic Water in the vicinity of Iceland. Unexpectedly, the mean boron to salinity ratio of (0.1324 +/- 0.0008 mg kg(-1)parts per thousand(-1) was similar to the ratio for the open ocean (0.1336 mg kg(-1)parts per thousand(-1)). The absence of anomalies in the boron to salinity ratio measured for our samples provides compelling evidence that continental freshwater flowing into the Arctic Ocean probably contains little dissolved boron, and hence has a negligible effect on the boron to salinity ratio in the Arctic Ocean. Our results also indicate that known deviations in the polar water alkalinity from predictions based on the open ocean alkalinity-salinity relationship stem largely from other sources, primarily inputs of carbonate-rich freshwater.
机译：从欧亚和北美的河流中排放淡水进入北冰洋的账户约占全球河流淡水投入的11％，并含有瓦隆的风化产品，包括溶解的大陆硼。这些淡水的大部分流入北大西洋，主要通过东格陵兰电流携带盐度<34.4。结果，含硼的淡水的输入可能导致低盐度水中的硼含量基于硼的开放海洋比率偏离预测。与预测的显着偏差会影响北极海水的碳酸盐系统计算。我们分析了海水样品的硼浓度和盐度（n = 249;盐度= 30-35），主要来自淡水投入影响下游的东格陵兰电流的地区，以及冰岛附近的北方流动的大西洋水。出乎意料地，平均硼至盐度比（0.1324 +/- 0.0008 mg（-1）份（-1）份（-1）的比例类似于开阔海洋的比例（0.1336 mg kg（-1）份（ - 1）。硼的缺乏对我们样品测量的盐度比率提供了令人信服的证据，即流入北冰洋的欧陆淡水可能含有很少的溶解硼，因此对北极中的硼对盐度比具有可忽略不计的影响海洋。我们的结果还表明，从基于开阔的海洋碱度 - 盐度关系的预测中，极性水碱度的已知偏差主要来自其他来源，主要是富含碳酸盐的淡水的输入。

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  • 来源
    《Marine Chemistry》 |2020年第20期|103809.1-103809.5|共5页
  • 作者

    Olafsson Jon; Lee Kitack; Olafsdottir Solveig R.; Benoit-Cattin Alice; Lee Chang-Ho; Kim Miok;

  • 作者单位

    Univ Iceland Inst Earth Sci Sturlugata 7 Askja IS-101 Reykjavik Iceland;

    Pohang Univ Sci & Technol Div Environm Sci & Engn Pohang South Korea;

    Marine & Freshwater Res Inst Reykjavik Iceland;

    Marine & Freshwater Res Inst Reykjavik Iceland;

    Pohang Univ Sci & Technol Div Environm Sci & Engn Pohang South Korea;

    Pohang Univ Sci & Technol Div Environm Sci & Engn Pohang South Korea;

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