Mercury Emissions, Atmospheric Concentrations, and Wet Deposition across the Conterminous United States: Changes over 20 Years of Monitoring,Environmental Science & Technology Letters

当前位置： X-MOL 学术 › Environ. Sci. Technol. Lett. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Mercury Emissions, Atmospheric Concentrations, and Wet Deposition across the Conterminous United States: Changes over 20 Years of Monitoring
Environmental Science & Technology Letters ( IF 8.9 ) Pub Date : 2020-05-15 , DOI: 10.1021/acs.estlett.0c00185
Connor I. Olson ₁ , Habibollah Fakhraei _{1,

2} , Charles T. Driscoll ₁

Affiliation

Mercury is a global pollutant whose supply to the environment has greatly increased due to human activities resulting in adverse effects on human and wildlife health. In response, the United States has substantially reduced mercury emissions over the last two decades, largely through air quality management; however, questions remain on the effectiveness of these emission controls in reducing mercury inputs to local ecosystems, due to a disproportional influence of global pools over local sources. Here, we show that trends in mercury concentrations in air and precipitation are largely decreasing across monitoring sites in the United States, coincident with decreases in stationary mercury emissions. Significant decreasing trends primarily occurred in the eastern United States, while trends in the western United States were more often insignificant or increasing, despite no clear increases in local, stationary emissions. For the eastern United States, local emissions appear to have had larger impacts on atmospheric and precipitation mercury concentrations than has been suggested from simulations using atmospheric models, suggesting that reductions in local mercury emissions can confer meaningful benefits to mercury-contaminated areas. These findings highlight the success of air management policies in the United States and are especially timely, as the United States Environmental Protection Agency has decided to roll back the Mercury and Air Toxics Standards.

中文翻译：

整个美国本土的汞排放，大气浓度和湿沉降：监测20年的变化

汞是一种全球污染物，由于人类活动，对环境的供应大大增加，从而对人类和野生动植物健康产生不利影响。作为回应，在过去的二十年中，美国主要通过空气质量管理大大减少了汞的排放；然而，由于全球资源池对当地来源的不成比例的影响，这些排放控制措施在减少向当地生态系统的汞输入方面的有效性仍然存在疑问。在这里，我们显示出在美国的各个监测点，空气和降水中汞浓度的趋势正在大大降低，同时汞的固定排放量也在下降。明显的下降趋势主要发生在美国东部，尽管美国当地的固定排放量没有明显增加，但美国西部的趋势往往微不足道或呈上升趋势。在美国东部，本地排放似乎对大气和降水中的汞浓度的影响要比使用大气模型进行模拟所暗示的要大，这表明本地汞排放的减少可以为受汞污染的地区带来有意义的利益。这些发现凸显了美国空气管理政策的成功，尤其是及时的，因为美国环境保护局已决定降低汞和空气有毒物质标准。与使用大气模型进行模拟所表明的结果相比，本地排放对大气和降水中汞浓度的影响似乎更大，这表明本地汞排放量的减少可以为受汞污染的地区带来有意义的利益。这些发现凸显了美国空气管理政策的成功，尤其是及时的，因为美国环境保护局已决定降低汞和空气有毒物质标准。与使用大气模型进行模拟所显示的结果相比，本地排放对大气和降水中汞浓度的影响似乎更大，这表明本地汞排放量的减少可以为受汞污染的地区带来有意义的利益。这些发现凸显了美国空气管理政策的成功，尤其是及时的，因为美国环境保护局已决定降低汞和空气有毒物质标准。

更新日期：2020-05-15

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11