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Variability of the Gaseous Elemental Mercury Sea-Air Flux of the Baltic Sea

机译:波罗的海的气态元素汞海空通量的变化

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摘要

The importance of the sea as a sink for atmospheric mercury has been established quantitatively through models based on wet and dry deposition data, but little is known about the release of mercury from sea areas. The concentration of elemental mercury (Hg~0) in sea surface water and in the marine atmosphere of the Baltic Sea was measured at high spatial resolution in February, April, July, and November 2006. Wind-speed records and the gas-exchange transfer velocity were then used to calculate Hg~0 sea-air fluxes on the basis of Hg~0 sea-air concentration differences. Our results show that the spatial resolution of the surface water Hg~0 data can be significantly improved by continuous measurements of Hg~0 in air equilibrated with water instead of quantitative extraction of Hg~0 from seawater samples. A spatial and highly seasonal variability of the Hg~0 sea-air flux was thus determined. In winter, the flux was low and changed in direction. In summer, a strong emission flux of up to 150 ng m~(-2) day~(-1) in the central Baltic Sea was recorded. The total emission of Hg~0 from the studied area (235000 km~2) was 4300 ± 1600 kg in 2006 and exceeded deposition estimates.
机译:通过基于湿和干沉积数据的模型,已经定量确定了海洋作为大气中汞汇的重要性,但对于从海域释放汞的知之甚少。 2006年2月,4月,7月和11月,以高空间分辨率对海面水和波罗的海海洋大气中的汞元素(Hg〜0)进行了测量。风速记录和气体交换传递然后,根据Hg〜0的海气浓度差,用Hg〜0速度计算Hg〜0的海气通量。我们的结果表明,通过连续测量水平衡后的空气中Hg〜0而不是从海水样品中定量提取Hg〜0,可以显着提高地表水Hg〜0数据的空间分辨率。因此,确定了Hg〜0海气通量的空间和高度季节性变化。在冬季,通量较低并且方向改变。夏季,在波罗的海中部记录到了高达150 ng m〜(-2)天〜(-1)的强排放通量。研究区域(235000 km〜2)的Hg〜0排放总量在2006年为4300±1600 kg,超过了沉积估算。

著录项

  • 来源
    《Environmental Science & Technology》 |2007年第23期|p.8018-8023|共6页
  • 作者

    JOACHIM KUSS; BERND SCHNEIDER;

  • 作者单位

    Department of Marine Chemistry, Leibniz Institute for Baltic Sea Research (IOW), Seestrasse 15, D-18119 Rostock-Warnemuende, Germany;

  • 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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