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有读书笔记Temporal trend and sources of speciated atmospheric mercury at Waliguan GAW station, Northwestern China

唐唐 添加于 2012-3-3 00:03 | 2181 次阅读 | 0 个评论

  •  作 者

    Fu XW, Feng X, Liang P, Deliger, Zhang H, Ji J, Liu P

  •  摘 要

    Measurements of speciated atmospheric mercury were conducted at a remote mountain-top station (Waliguan (WLG) Baseline Observatory) at the edge of northeastern part of the Qinghai-Xizang Plateau, Western China. Mean concentrations of total gaseous mercury (TGM), particulate bound mercury (PBM), and gaseous oxidized mercury (GOM) during the whole sampling campaign were 1.98±0.98 ng m−3, 19.4±18.1 pg m−3, and 7.4±4.8 pg m−3, respectively. Levels of speciated Hg at WLG were slightly higher than those reported from remote areas of North America and Europe. Both regional sources and long-rang transport played important roles in the distribution of atmospheric TGM and PBM at WLG, whereas GOM showed major links to the regional sources, likely as well as the in-situ productions via photochemical processes. Regional sources for speciated Hg were mostly located to the east of WLG, which is the most industrial and urbanized areas of Qinghai province. Potential source contribution function (PSCF) results showed that eastern Gansu, western Ningxia and Shanxi Province were likely the potential source regions of WLG, with good accordance with locations of urban areas and industrial centers. Moreover, we found that Northern India may be a significant source region for WLG during the sampling campaign, and this is the first published evidence suggesting long-range transport of atmospheric Hg from India to the Northeastern Tibetan Plateau. Seasonal and diurnal variations of TGM were in contrast to most of the previous studies in China, with relatively higher levels in warm seasons and night, respectively. The temporal trend of TGM also highlighted the impact of long-range transport on the distribution of TGM in ambient air at WLG.

  •  详细资料

    • 文献种类:期刊
    • 期刊名称: Atmospheric Chemistry and Physics
    • 期刊缩写: Atmos. Chem. Phys.
    • 期卷页: 2012年  第12卷 第4期 1951-1964页
    • ISBN: 1680-7324

  • 相关链接 DOI URL 

  •  唐唐 的文献笔记  订阅

    印度汞释放对青藏高原有直接影响
    目前，最新一期《大气化学与物理》（Atmospheric Chemistry and Physics）上发表了中科院地球化学研究所环境地球化学国家重点实验室冯新斌课题组的研究成果。他们在青海省瓦里关大气本底站对大气三种主要形态汞——气态单质汞（Hg0）、气态氧化态汞（GOM）和颗粒吸附态汞（PBM）进行了为期一年的连续观测。
     
    瓦里关大气本底站是世界气象组织全球大气观测网24个全球本底站中，唯一位于欧亚大陆深部的大气基准站，也是目前全球海拔最高的大气本底基准观象台。此次工作的开展，对于填补目前欧亚内陆大气汞形态观测的空白，以及研究青藏高原大气汞的来源及分布特征有重要意义。
     
    2007年9月至2008年9月，冯新斌课题组观测期间，瓦里关大气Hg0、GOM和PBM的平均浓度分别为1.98 ± 0.98 ng m-3、7.4 ± 4.8 pg m-3 和19.4 ± 18.1 pg m-3，基本上和北半球其他背景区的观测结果一致。
     
    通过数据分析，研究人员发现，瓦里关大气Hg0和PBM主要受到长距离的大气传输作用影响，而GOM的分布规律主要与观测站周边的污染源分布以及近地表的Hg0向GOM的光化学转化反应有关。
     
    通过模型估算得出，我国西部工业和城市中心如青海省东部、甘肃省东部、陕西和宁夏西部等地区是瓦里关大气Hg0的一个重要污染来源。
     
    此外，值得指出的是，他们的结果发现印度西北部重度污染区域也是瓦里关大气汞的一个重要来源。印度是目前全球人为排放最为集中的一个区域，已经引起了全球的广泛关注，而此次研究则是第一次发现印度汞释放对我国青藏高原有直接的影响。（来源：中国科学报 柯讯）
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