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首页> 外文期刊>Environmental Science & Technology >Constraining Atmospheric Selenium Emissions Using Observations, Global Modeling, and Bayesian Inference
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Constraining Atmospheric Selenium Emissions Using Observations, Global Modeling, and Bayesian Inference

机译：使用观察，全球建模和贝叶斯推论约束大气硒排放

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摘要

Selenium (Se) is an essential dietary element for humans and animals, and the atmosphere is an important source of Se to soils. However, estimates of global atmospheric Se fluxes are highly uncertain. To constrain these uncertainties, we use a global model of atmospheric Se cycling and a database of more than 600 sites where Se in aerosol has been measured. Applying Bayesian inference techniques, we determine the probability distributions of global Se emissions from the four major sources: anthropogenic activities, volcanoes, marine biosphere, and terrestrial biosphere. Between 29 and 36 Gg of Se are emitted to the atmosphere every year, doubling previous estimates of emissions. Using emission parameters optimized by aerosol network measurements, our model shows good agreement with the aerosol Se observations (R~2 = 0.66), as well as with independent aerosol (0.59) and wet deposition measurements (0.57). Both model and measurements show a decline in Se over North America in the last two decades because of changes in technology and energy policy. Our results highlight the role of the ocean as a net atmospheric Se sink, with around 7 Gg yr~(-1) of Se transferred from land through the atmosphere. The constrained Se emissions represent a substantial step forward in understanding the global Se cycle.
机译：硒（SE）是人类和动物的必需膳食元素，气氛是土壤的重要来源。然而，全球大气SE助熔剂的估计非常不确定。为了限制这些不确定性，我们使用全球大气SE循环和一个超过600个网站的数据库，其中已经测量了气溶胶中的SE。应用贝叶斯推理技术，我们确定了四个主要来源的全球硒排放的概率分布：人类学活动，火山，海洋生物圈和陆地生物圈。每年29至36克的SE被排放到大气中，以前的排放估计倍增。使用由气溶胶网络测量优化的发射参数，我们的模型与气溶胶SE观察（R〜2 = 0.66）以及独立的气溶胶（0.59）和湿沉积测量（0.57）进行了良好的一致性。由于技术和能源政策的变化，模型和测量均显示出在过去二十年中SE在过去二十年中的下降。我们的结果突出了海洋作为净气图SE水槽的作用，大约7 GG YR〜（-1）的SE从陆地转移到大气中。受约束的SE排放代表了了解全球SE周期的重要一步。

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  • 来源
    《Environmental Science & Technology》 |2020年第12期|7146-7155|共10页
  • 作者

    Aryeh Feinberg; Andrea Stenke; Thomas Peter; Lenny H. E. Winkel;

  • 作者单位

    Institute for Atmospheric and Climate Science and Institute of Biogeochetnistry and Pollutant Dynamics ETH Zurich Zurich 8092 Switzerland Eawag Swiss Federal Institute of Aquatic Science and Technology Duebendorf 8600 Switzerland;

    Institute for Atmospheric and Climate Science ETH Zurich Zurich 8092 Switzerland;

    Institute for Atmospheric and Climate Science ETH Zurich Zurich 8092 Switzerland;

    Institute of Biogeochemistry and Pollutant Dynamics ETH Zurich Zurich 8092 Switzerland Eawag Swiss Federal Institute of Aquatic Science and Technology Duebendorf 8600 Switzerland;

  • 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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