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首页> 外文期刊>Environmental Science & Technology >Polycyclic Aromatic Hydrocarbons in the Atmosphere near the Great Lakes: Why Do Their Concentrations Vary?
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Polycyclic Aromatic Hydrocarbons in the Atmosphere near the Great Lakes: Why Do Their Concentrations Vary?

机译：在大湖泊附近的大气中的多环芳烃：为什么他们的浓度会有所不同？

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摘要

Polycyclic aromatic hydrocarbon (PAH) concentrations were measured in atmospheric samples collected at five sites near the shores of the North American Great Lakes once every 12 days from 1997 to 2018 (inclusive). These data were analyzed using multiple linear regression statistics to isolate the environmental variables controlling these PAH concentrations. About 74% of the variability is related to the number of people living and working within 25 km of the sampling site. Clearly, urban areas are major sources of PAH to the atmosphere. PAH concentrations at all sites lumped together are decreasing with halving times of about 25 years, and this factor represents about 1.5% of the variability. This is slower than the halving times for most banned compounds because PAH continue to be emitted directly into the atmosphere from many combustion sources. In the atmosphere, the concentrations of relatively volatile PAH maximize in July, but those of relatively nonvolatile PAH maximize in January. This seasonality factor represents about 2.5% of the variability. PAH concentrations at these Great Lakes sites tend to be elevated when the wind is coming out of the south-southeast, and this factor represents about 1.2% of the variability. PAH concentrations are lower when the wind speed is higher; this is a significant but small effect, representing only about 0.17% of the variability. The sum of these partial variabilities is about 80%, which suggests that the measurement and sampling errors are about 20%, which is a reasonable value. On the basis of two approaches, the range of atmospheric PAH transport from these sites is estimated to be on the order of 100-200 km. For these data, meteorology matters, but not by much.
机译：在从1997年到2018年的每12天到2018年每12天使用多个线性回归统计分析这些数据，以隔离控制这些PAH浓度的环境变量。大约74％的可变性与生活中的人数和工作在25千米范围内有关。显然，城市地区是PAH的主要来源。所有遗址的PAH浓度在一起逐渐减少约25岁的减半，并且该因子占变异性的1.5％。这比大多数禁止化合物的减半时间慢，因为PAH继续直接从许多燃烧源直接发射到大气中。在大气中，7月份相对挥发的PAH的浓度最大化，但相对非挥发性PAH的浓度最大化1月份。这种季节性因素占变异性的约2.5％。当风从南东南出来时，这些大湖泊站点的PAH浓度往往会升高，这一因素占变异性的1.2％。当风速较高时，PAH浓度较低;这是一个重要但小的效果，只有约0.17％的变异性。这些部分变量的总和约为80％，这表明测量和采样误差约为20％，这是一个合理的值。在两种方法的基础上，估计这些地点的大气PAH运输范围约为100-200公里。对于这些数据，气象学问题，但不是很多。

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  • 来源
    《Environmental Science & Technology》 |2021年第14期|9444-9449|共6页
  • 作者

    Ronald A. Hites;

  • 作者单位

    O'Neill School of Public and Environmental Affairs Indiana University Bloomington Indiana 474015 United States;

  • 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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  • 正文语种 eng
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