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Uncertainty Assessment of Gaseous Oxidized Mercury Measurements Collected by Atmospheric Mercury Network

机译：大气汞网络收集的气态氧化汞测量值的不确定度评估

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摘要

Gaseous oxidized mercury (GOM) measurement uncertainties undoubtedly impact the understanding of mercury biogeochemical cycling; however, there is a lack of consensus on the uncertainty magnitude. The numerical method presented in this study provides an alternative means of estimating the uncertainties of previous GOM measurements. Weekly GOM in ambient air was predicted from measured weekly mercury wet deposition using a scavenging ratio approach, and compared against field measurements of 2-4 hly GOM to estimate the measurement biases of the Tekran speciation instruments at 13 Atmospheric Mercury Network (AMNet) sites. Multiyear average GOM measurements were estimated to be biased low by more than a factor of 2 at six sites, between a factor of 1.5 and 1.8 at six other sites, and below a factor of 1.3 at one site. The differences between predicted and observed were significantly larger during summer than other seasons potentially because of higher ozone concentrations that may interfere with GOM sampling. The analysis data collected over six years at multiple sites suggests a systematic bias in GOM measurements, supporting the need for further investigation of measurement technologies and identifying the chemical composition of GOM.
机译：气态氧化汞（GOM）测量不确定性无疑会影响对汞生物地球化学循环的理解；但是，对于不确定性的大小缺乏共识。在这项研究中提出的数值方法提供了一种替代的方法来估计以前的GOM测量的不确定性。使用清除率法，通过每周测得的湿汞湿润沉积来预测周围空气中的每周GOM，并将其与2-4小时GOM的现场测量值进行比较，以估算Tekran形态仪器在13个大气汞网络（AMNet）站点的测量偏差。估计多年平均GOM测量值在六个地点的偏倚低了2倍以上，在其他六个地点的偏远系数在1.5到1.8之间，而在一个地点的偏低系数在1.3以下。夏季期间，预测值和观测值之间的差异明显大于其他季节，这可能是因为较高的臭氧浓度可能会干扰GOM采样。六年来在多个地点收集的分析数据表明，GOM测量存在系统性偏差，支持对测量技术进行进一步研究并确定GOM的化学成分的需求。

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  • 来源
    《Environmental Science & Technology》 |2017年第2期|855-862|共8页
  • 作者

    Irene Cheng; Leiming Zhang;

  • 作者单位

    Air Quality Research Division, Science and Technology Branch, Environment and Climate Change Canada, Toronto, Ontario M3H ST4 Canada;

    Air Quality Research Division, Science and Technology Branch, Environment and Climate Change Canada, Toronto, Ontario M3H ST4 Canada;

  • 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
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