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Mercury Distribution and Deposition in Glacier Snow over Western China

机译：中国西部冰川雪中汞的分布与沉积

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摘要

Western China is home to the largest aggregate of glaciers outside the polar regions, yet little is known about how the glaciers in this area affect the transport and cycling of mercury (Hg) regionally and globally. From 2005 to 2010, extensive glacier snow sampling campaigns were carried out in 14 snowpits from 9 glaciers over western China, and the vertical distribution profiles of Hg were obtained. The Total Hg (THg) concentrations in the glacier snow ranged from <1 to 43.6 ng L~(-1), and exhibited clear seasonal variations with lower values in summer than in winter. Spatially, higher THg concentrations were typically observed in glacier snows from the northern region where atmospheric particulate loading is comparably high. Glacier snowpit Hg was largely dependent on particulate matters and was associated with particulate Hg, which is less prone to postdepositional changes, thus providing a valuable record of atmospheric Hg deposition. Estimated atmospheric Hg depositional fluxes ranged from 0.74 to 7.89 μg m~(-2) yr~(-1), agreeing very well with the global natural values, but are one to two orders of magnitude lower than that of the neighboring East Asia. Elevated Hg concentrations were observed in refrozen ice layers in several snowpits subjected to intense melt, indicating that Hg can be potentially released to meltwater.
机译：中国西部是极地地区以外最大的冰川聚集地，但对该地区的冰川如何影响区域和全球汞（Hg）的运输和循环知之甚少。 2005年至2010年，在中国西部9个冰川的14个雪场中开展了广泛的冰川雪采样活动，获得了汞的垂直分布剖面。冰川雪中的总Hg（THg）浓度范围在<1至43.6 ng L〜（-1）之间，并且表现出明显的季节变化，夏季的值低于冬季。在空间上，通常在大气颗粒物负荷相对较高的北部地区的冰川雪中观察到较高的THg浓度。冰川雪坑中的Hg主要取决于颗粒物，并与颗粒Hg有关，后者较不易发生沉积后变化，因此提供了大气Hg沉积的有价值记录。估计的大气汞沉积通量范围为0.74至7.89μgm〜（-2）yr〜（-1），与全球自然值非常吻合，但比邻国的东亚低1至2个数量级。在遭受强烈融化的几个雪坑中，冰层中的汞浓度升高，这表明汞有可能释放到熔水中。

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  • 来源
    《Environmental Science & Technology》 |2012年第10期|p.5404-5413|共10页
  • 作者

    Qianggong Zhang; Jie Huang; Feiyue Wang; Loewen Mark; Jianzhong Xu; Debbie Armstrong; Chaoliu Li; Yulan Zhang; Shichang Kang;

  • 作者单位

    Key Laboratory of Tibetan Environment Changes and Land Surface Processes, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Jia 4 Datun Road, Chaoyang District, Beijing, 100101, P.R. China;

    Key Laboratory of Tibetan Environment Changes and Land Surface Processes, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Jia 4 Datun Road, Chaoyang District, Beijing, 100101, P.R. China;

    Department of Chemistry, and Department of Environment and Geography, University of Manitoba, Winnipeg, MB R3T 2N2,Canada,State Key Laboratory of Cryospheric Sciences, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, 730000, P.R. China;

    Department of Chemistry, and Department of Environment and Geography, University of Manitoba, Winnipeg, MB R3T 2N2,Canada;

    State Key Laboratory of Cryospheric Sciences, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, 730000, P.R. China;

    Department of Chemistry, and Department of Environment and Geography, University of Manitoba, Winnipeg, MB R3T 2N2,Canada;

    Key Laboratory of Tibetan Environment Changes and Land Surface Processes, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Jia 4 Datun Road, Chaoyang District, Beijing, 100101, P.R. China;

    Key Laboratory of Tibetan Environment Changes and Land Surface Processes, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Jia 4 Datun Road, Chaoyang District, Beijing, 100101, P.R. China;

    Key Laboratory of Tibetan Environment Changes and Land Surface Processes, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Jia 4 Datun Road, Chaoyang District, Beijing, 100101, P.R. China,State Key Laboratory of Cryospheric Sciences, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, 730000, P.R. China;

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