...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Environmental Science & Technology >Recent Changes in Atmospheric Mercury Deposition Recorded in the Sediments of Remote Equatorial Lakes in the Rwenzori Mountains, Uganda
【24h】

Recent Changes in Atmospheric Mercury Deposition Recorded in the Sediments of Remote Equatorial Lakes in the Rwenzori Mountains, Uganda

机译：乌干达Rwenzori山偏远赤道湖沉积物中记录的大气汞沉积的最新变化

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

We analyzed sediment cores collected from three equatorial zone lakes in the Rwenzori Mountains of Uganda for Hg and dated them using ~(210)Pb. The results show that the lakes have been contaminated by anthropogenic Hg from atmospheric deposition and that the onset of Hg pollution in the region began at least by the late 19th century. Mercury accumulation in all sediment cores increased by about 3-fold since the mid-19th century, a similar increase to that shown in other remote regions worldwide. These results from tropical high-elevation sites are the first forthis region and contribute to our understanding of global Hg pollution trends. The atmospheric boundary layer is at a higher altitude in equatorial areas than at midlatjtudes, and therefore, Hg deposition in these regions may not be enhanced by diurnal penetration of tropospheric air and associated reactive gaseous mercury as has been reported for mountain lakes at higher latitudes. Furthermore, the relatively low abundance of atmospheric oxidants may limit the amount of gaseous elemental mercury oxidized to the reactive gaseous form in equatorial Africa. These Rwenzori Hg records therefore have important implications for the understanding of Hg dynamics at high elevations in equatorial regions.
机译：我们分析了从乌干达Rwenzori山的三个赤道带湖泊收集的沉积物核心中的Hg，并使用〜（210）Pb对它们进行了测年。结果表明，湖泊已被大气沉积物中的人为汞污染，该地区的汞污染至少在19世纪后期才开始出现。自19世纪中叶以来，所有沉积物核心中的汞积累量增加了约3倍，与世界其他偏远地区的汞积累量相似。热带高海拔站点的这些结果是该地区的首例结果，有助于我们了解全球汞污染趋势。赤道地区的大气边界层比中纬线的海拔更高，因此，如对高纬度高山湖泊的报道，对流层空气和相关的活性气态汞的日渗透可能不会增加这些地区的汞沉积。此外，相对较少的大气氧化剂可能会限制赤道非洲地区氧化成反应性气态形式的气态元素汞的量。因此，这些Rwenzori汞记录对了解赤道地区高海拔地区的汞动力学具有重要意义。

著录项

  • 来源
    《Environmental Science & Technology》 |2010年第17期|p.6570-6575|共6页
  • 作者

    HANDONG YANG; DANIEL R. ENGSTROM; NEIL L. ROSE;

  • 作者单位

    Environmental Change Research Centre, University College London, Pearson Building, Gower Street, London WC1E 6BT, United Kingdom;

    rnSt. Croix Watershed Research Station, Science Museum of Minnesota, Marine on St. Croix, Minnesota 55047;

    rnEnvironmental Change Research Centre, University College London, Pearson Building, Gower Street, London WC1E 6BT, United Kingdom;

  • 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);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号