Seasonal variations, speciation and possible sources of mercury in the snowpack of Zhadang glacier, Mt. Nyainqêntanglha, southern Tibetan Plateau.
Seasonal variations, speciation and possible sources of mercury in the snowpack of Zhadang glacier, Mt. Nyainqêntanglha, southern Tibetan Plateau.
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DOI：
10.1016/j.scitotenv.2012.04.045
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发表时间：
2012-07
期刊：
影响因子：
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通讯作者：
Jie Huang;Shi-chang Kang;Junming Guo;Qianggong Zhang;Jianzhong Xu;Matt G. Jenkins;Guo-shuai Zhang;Kang Wang
中科院分区：
文献类型：
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作者：
Jie Huang;Shi-chang Kang;Junming Guo;Qianggong Zhang;Jianzhong Xu;Matt G. Jenkins;Guo-shuai Zhang;Kang Wang
2008年和2011年，我们对扎当冰川的10个雪坑进行了采样，以调查青藏高原南部汞（Hg）的季节变化、形态和来源。在 2008 年雪坑中，总汞 (HgT)、颗粒物、大部分主要离子的浓度在非季风季节比季风季节要高。 Hg 形态分析表明 2011 年雪坑中的 HgT 主要是颗粒结合的 Hg (HgP)。 2008年雪坑中的大部分颗粒物以细颗粒物为主，表明颗粒物和HgP的流入可能是通过大气环流进行长距离输送而发生的。对主要离子Ca2+和碱性pH值的分析表明，沙尘暴活动产生的远距离迁移的HgP可能是非季风季节扎当冰川雪坑中最重要的Hg来源。后向轨迹分析表明，到达扎当冰川的气团大部分来自印度西北部干旱地区（如塔尔沙漠），证实中亚和南亚干旱地区可能是扎当冰川雪坑沉积汞的主要来源。这项研究还表明，青藏高原的冰芯记录可能是解释大气汞沉积的长期历史记录和重建汞生物地球化学循环的有用工具。
Ten snowpits were sampled at the Zhadang glacier during 2008 and 2011 to investigate the seasonal variations, speciation, and sources of mercury (Hg) in the southern Tibetan Plateau. In the 2008 snowpit, total Hg (HgT), particulate matter, most of major ions were found in higher concentrations during the non-monsoon season than in the monsoon season. Analysis of Hg speciation indicated that HgTin the 2011 snowpits was dominated by particulate-bound Hg (HgP). Most of particulate matter in the 2008 snowpit was dominated by fine particulates, indicating that the influx of particulate matter and HgPwas probably occurring by long-range transportation via general atmospheric circulation. Analysis of dominant ion Ca2+and alkaline pH values has suggested that the long-range transported HgP, originating from dust storm activities, may be the most important source for Hg in the Zhadang glacier snowpit during the non-monsoon season. Backward-trajectory analysis indicates the majority of the air masses arriving at the Zhandang glacier originated from the arid regions of northwestern India (e.g., Thar Desert), confirming that arid regions in central and southern Asia are likely the main sources of Hg being deposited in the Zhadang glacier snowpit. This study also suggests that ice core records from the Tibetan Plateau may be useful tools for interpreting long-term historical records of atmospheric Hg deposition, and reconstructing Hg biogeochemical cycling.