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Mercury Export from the Yukon River Basin and Potential Response to a Changing Climate

机译：育空河流域的汞出口及其对气候变化的潜在反应

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摘要

We measured mercury (Hg) concentrations and calculated export and yield from the Yukon River Basin (YRB) to quantify Hg flux from a large, permafrost-dominated, high-latitude watershed. Exports of Hg averaged 4400 kg Hg yr-1 The average annual yield for the YRB during the study period was 5.17ugm~2 yr-1, which is 3-32 times more than Hg yields reported for 8 other major northern hemisphere river basins. The vast majority (90%) of Hg export is associated with particulates. Half of the annual export of Hg occurred during the spring with about 80% of 34 samples exceeding the U.S. EPA Hg standard for adverse chronic effects to biota. Dissolved and particulate organic carbon exports explained 81% and 50%, respectively, of the variance in Hg exports, and both were significantly (p < 0.001) correlated with water discharge. Recent measurements indicate that permafrost contains a substantial reservoir of Hg. Consequently, climate warming will likely accelerate the mobih'zation of Hg from thawing permafrost increasing the export of organic carbon associated Hg and thus potentially exacerbating the production of bioavailable methylmercury from permafrost-dominated northern river basins.
机译：我们测量了汞（Hg）的浓度，并计算了育空河盆地（YRB）的出口和产量，以量化来自多年冻土为主的高纬度大流域中的汞通量。汞的平均出口量为4400千克汞yr-1。在研究期间，黄河三角洲的年平均产量为5.17ugm〜2 yr-1，这是北半球其他8个主要流域报道的汞产量的3-32倍。汞出口的绝大部分（90％）与微粒有关。每年汞的一半出口发生在春季，其中34个样品中约有80％超过了美国EPA汞对生物群的不利慢性影响的标准。溶解的和颗粒状的有机碳出口分别解释了汞出口变化的81％和50％，并且两者均与水排放显着相关（p <0.001）。最近的测量表明，多年冻土中含有大量的汞。因此，气候变暖将可能通过解冻多年冻土来加速汞的流动，从而增加与汞相关的有机碳的出口，从而有可能加剧永久冻土为主的北部河流域生物可利用的甲基汞的生产。

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  • 来源
    《Environmental Science & Technology》 |2011年第21期|p.9262-9267|共6页
  • 作者

    Paul F. Schuster; Robert G. Striegl; George R. Aiken; David P. Krabbenhoft; John F. Dewild; Kenna Butler; Ben Kamark; Mark Dornblaser;

  • 作者单位

    U.S. Geological Survey, 3215 Marine Street, Boulder, Colorado 80303, United States;

    U.S. Geological Survey, 3215 Marine Street, Boulder, Colorado 80303, United States;

    U.S. Geological Survey, 3215 Marine Street, Boulder, Colorado 80303, United States;

    U.S. Geological Survey, 3215 Marine Street, Boulder, Colorado 80303, United States;

    U.S. Geological Survey, 8505 Research Way, Middleton, Wisconsin 53562, United States;

    U.S. Geological Survey, 3215 Marine Street, Boulder, Colorado 80303, United States;

    U.S. Geological Survey, 3215 Marine Street, Boulder, Colorado 80303, United States;

    U.S. Geological Survey, 3215 Marine Street, Boulder, Colorado 80303, 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);
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