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首页> 外文期刊>Environmental Science & Technology >Larch Tree Rings as a Tool for Reconstructing 20th Century Central European Atmospheric Mercury Trends
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Larch Tree Rings as a Tool for Reconstructing 20th Century Central European Atmospheric Mercury Trends

机译：落叶松年轮作为重建20世纪中欧大气汞趋势的工具

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摘要

We propose the tree rings of European Larch (Larix decidua) as a widely available and reliable geochemical archive of local and regional changes in atmospheric mercury (Hg). Mean Hg concentrations in larch tree rings from 8 background sites across the Czech Republic ranged from 2.2 to 4.8 mu g kg(-1); the maximum concentrations occurred in the period 1951-1970. At 3 sites impacted by Hg-emission sources [gold amalgamation processing, caustic soda production, and lead (Pb) ore smelting] mean larch tree ring Hg concentrations were significantly elevated relative to background sites. Changes in larch tree ring Hg concentrations were temporally coherent with known activities at the sites that would alter Hg emissions; the nearly simultaneous response in tree rings indicated little or no translocation of Hg within the larch bole. Based on the present-day atmospheric Hg concentration of 1.63 ng m(-3) at the intensively monitored Czech Global Mercury Observation System site and the most recent mean tree ring Hg concentration of 2.8 mu g kg(-1) in colocated larch trees, we developed a simple distribution model of Hg between the atmosphere and larch tree rings. We applied the model using observed changes of Hg in larch tree rings from the countrywide background sites to reconstruct past atmospheric Hg concentrations in central Europe. Modeled Hg concentrations were in agreement with annual means from the European Monitoring and Evaluation Programme observatories.
机译：我们建议将欧洲落叶松（Larix decidua）的年轮作为大气汞（Hg）局部和区域变化的广泛可用且可靠的地球化学档案。捷克共和国8个背景站点落叶松年轮中的平均Hg浓度范围为2.2至4.8μg kg（-1）。最大浓度发生在1951-1970年期间。在3个受汞排放源影响的地点[金汞齐处理，苛性钠生产和铅（Pb）矿石冶炼]，相对于背景地点，落叶松树木年轮中的汞浓度显着升高。落叶松年轮中汞浓度的变化与可能改变汞排放的地点的已知活动在时间上是一致的。在树木年轮中几乎同时发生的响应表明，落叶松内胆中汞极少或没有迁移。根据目前在受到高度监测的捷克全球汞观测系统站点上的大气Hg浓度为1.63 ng m（-3），以及在同一地点的落叶松树中最新的年轮平均Hg浓度为2.8μg kg（-1），我们开发了大气和落叶松树年轮之间汞的简单分布模型。我们应用了该模型，使用了来自全国背景站点的落叶松树年轮中汞的观测变化，以重建中欧过去的大气汞浓度。汞的模拟浓度与欧洲监测与评估计划观测站的年度平均值一致。

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  • 来源
    《Environmental Science & Technology》 |2018年第19期|11060-11068|共9页
  • 作者

    Navratil Tomas; Novakova Tereza; Shanley James B.; Rohovec Jan; Matouskova Sarka; Vankova Maria; Norton Stephen A.;

  • 作者单位

    Czech Acad Sci, Inst Geol, Rozvojova 269, Prague 16500, Czech Republic;

    Czech Acad Sci, Inst Geol, Rozvojova 269, Prague 16500, Czech Republic;

    US Geol Survey, POB 628, Montpelier, VT 05601 USA;

    Czech Acad Sci, Inst Geol, Rozvojova 269, Prague 16500, Czech Republic;

    Czech Acad Sci, Inst Geol, Rozvojova 269, Prague 16500, Czech Republic;

    Czech Acad Sci, Inst Geol, Rozvojova 269, Prague 16500, Czech Republic;

    Univ Maine, Orono, ME 04469 USA;

  • 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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