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首页> 外文期刊>Environmental Science & Technology >Drivers of Mercury Cycling in the Rapidly Changing Glacierized Watershed of the High Arctic's Largest Lake by Volume (Lake Hazen, Nunavut, Canada)
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Drivers of Mercury Cycling in the Rapidly Changing Glacierized Watershed of the High Arctic's Largest Lake by Volume (Lake Hazen, Nunavut, Canada)

机译：按体积计算，在北极圈内最大湖泊的快速变化的冰川化流域中，汞循环的驱动因素（加拿大努纳武特湖哈岑）

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摘要

Across the Arctic, glaciers are melting and permafrost is thawing at unprecedented rates, releasing not only water to downstream aquatic systems, but also contaminants like mercury, archived in ice over centuries. Using concentrations from samples collected over 4 years and calibrated modeled hydrology, we calculated methylmercury (MeHg) and total mercury (THg) mass balances for Lake Hazen, the world's largest High Arctic lake by volume, for 2015 and 2016. Glacial rivers were the most important source of MeHg and THg to Lake Hazen, accounting for up to 53% and 94% of the inputs, respectively. However, due to the MeHg and THg being primarily particle-bound, Lake Hazen was an annual MeHg and THg sink. Exports of MeHg and THg out the Ruggles River outflow were consequently very low, but erosion and permafrost slumping downstream of the lake increased river MeHg and THg concentrations significantly before entering coastal waters in Chandler Fjord. Since 2001, glacial MeHg.and THg inputs to Lake Hazen have increased by 0.01 and 0.400 kg yr(-1), respectively, in step with dramatic increases in glacial melt. This study highlights the potential for increases in mercury inputs to arctic ecosystems downstream of glaciers despite recent reductions in global mercury emissions.
机译：在整个北极地区，冰川正在融化，永久冻土正在以前所未有的速度融化，不仅向下游水生系统释放了水，而且还释放了几个世纪以来储存在冰中的汞等污染物。使用四年来收集的样本中的浓度和经过校准的水文模型，我们计算了2015和2016年全球最大的高北极湖黑岑湖甲基汞（MeHg）和总汞（THg）的质量平衡。冰川河最多Mezen和THg是Hazen湖的重要来源，分别占投入的53％和94％。但是，由于MeHg和THg主要是颗粒结合的，所以Hazen湖是每年的MeHg和THg汇。因此，从Ruggles河流出的MeHg和THg的出口量非常低，但是湖水下游的侵蚀和多年冻土暴跌使MeHg和THg的浓度显着增加，然后才进入钱德勒峡湾的沿海水域。自2001年以来，向黑森湖的冰川MeHg和THg投入分别增加了0.01和0.400 kg yr（-1），与此同时，冰川融化也急剧增加。这项研究强调了尽管全球汞排放量最近有所减少，但对冰川下游北极生态系统的汞输入量仍有增加的潜力。

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  • 来源
    《Environmental Science & Technology》 |2019年第3期|1175-1185|共11页
  • 作者

    St. Pierre K. A.; St. Louis V. L.; Lehnherr I.; Gardner A. S.; Serbu J. A.; Mortimer C. A.; Muir D. C. G.; Wiklund J. A.; Lemire D.; Szostek L.; Talbot C.;

  • 作者单位

    Univ Alberta, Dept Biol Sci, Edmonton, AB T6G 2E9, Canada;

    Univ Alberta, Dept Biol Sci, Edmonton, AB T6G 2E9, Canada;

    Univ Toronto Mississauga, Dept Geog, Mississauga, ON L5L 1C6, Canada;

    CALTECH, NASA, Jet Prop Lab, Pasadena, CA 91109 USA;

    Univ Alberta, Dept Biol Sci, Edmonton, AB T6G 2E9, Canada;

    Univ Alberta, Dept Earth & Atmospher Sci, Edmonton, AB T6G 2E3, Canada;

    Canadian Ctr Inland Waters, Environm & Climate Change Canada, Burlington, ON L7S 1A1, Canada;

    Univ Waterloo, Dept Biol, Waterloo, ON N2L 3G1, Canada;

    Univ Toronto Mississauga, Dept Geog, Mississauga, ON L5L 1C6, Canada;

    Univ Alberta, Dept Biol Sci, Edmonton, AB T6G 2E9, Canada;

    Canadian Ctr Inland Waters, Environm & Climate Change Canada, Burlington, ON L7S 1A1, Canada;

  • 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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