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首页> 外文期刊>Environmental Science & Technology >Enhanced Deposition and Bioaccumulation of Mercury in Antarctic Terrestrial Ecosystems Facing a Coastal Polynya
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Enhanced Deposition and Bioaccumulation of Mercury in Antarctic Terrestrial Ecosystems Facing a Coastal Polynya

机译:面对沿海波利亚尼亚的南极陆地生态系统中汞的沉积和生物富集

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摘要

Mercury emitted by anthropogenic and natural sources occurs in the atmosphere mostly in the gaseous elemental form,which has a long lifetime in tropical and temperate regions.Once deposited in terrestrial and aquatic ecosystems the metal is partly re-emitted into the air,thus assuming the characteristics of global pollutants such as persistent volatile chemicals.In polar regions,during and after the sunrise,the photochemically driven oxidation of gaseous Hg by reactive halogens may result in areas of greatly enhanced Hg deposition.Mercury concentrations in soils,lichens,and mosses collected in a stretch between 74 deg 30'S and 76 deg 00'S,in ice-free coastal areas of Victoria Land facing the Terra Nova Bay coastal polynya,were higher than typical Antarctic baselines.The finding of enhanced Hg bioaccumulation in Antarctic terrestrial ecosystems facing a coastal polynya strongly supports recent speculations on the role of ice crystals("frost flowers")growing in polynyas as a dominant source of sea salt aerosols and bromine compounds,which are involved in springtime mercury depletion events(MDEs).These results raise concern about the possible environmental effects of changes in regional climate and sea ice coverage,and on the possible role of Antarctica as a sink in the mercury cycle.
机译:人为和自然来源排放的汞主要以气态元素形式存在于大气中,在热带和温带地区的寿命很长。一旦沉积在陆地和水生生态系统中,金属就会部分重新排放到空气中,因此假设污染物的特征,如持久性挥发性化学物质。在极地地区,在日出期间和之后,反应性卤素的光化学驱动气态汞氧化可能导致汞沉积大大增强。土壤,地衣和苔藓中汞的浓度在维多利亚土地面对Terra Terra Nova湾沿岸多年生植物的无冰海岸地区中,温度介于74度30到00度之间,高于典型的南极基线。在面临沿海多年生植物的南极陆地生态系统中,汞生物蓄积增加的发现强烈支持最近关于在polyyas中生长的冰晶(“霜花”)作为主要来源的作用的推测春季汞消耗事件(MDE)中涉及的海盐气溶胶和溴化合物的数量增加。这些结果引起人们对区域气候和海冰覆盖变化的可能环境影响以及南极洲作为汇的可能作用的关注在汞循环中。

著录项

  • 来源
    《Environmental Science & Technology》 |2005年第21期|p.8150-8155|共6页
  • 作者单位

    Dipartimento di Scienze Ambientali,Universita di Siena,Via P.A.Mattioli,4;

    53100 Siena,Italy;

    Dipartimento di Scienze Ambientali,Universita di Siena,Via P.A.Mattioli,4;

    53100 Siena,Italy;

    Dipartimento di Scienze Ambientali,Universita di Siena,Via P.A.Mattioli,4;

    53100 Siena,Italy;

    Dipartimento di Scienze Ambientali,Universita di Siena,Via P.A.Mattioli,4;

    53100 Siena,Italy;

  • 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 环境化学;
  • 关键词

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