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首页> 外文期刊>Environmental Science & Technology >Current and Future Responses of Aerosol pH and Composition in the U.S. to Declining SO_2 Emissions and Increasing NH_3 Emissions
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Current and Future Responses of Aerosol pH and Composition in the U.S. to Declining SO_2 Emissions and Increasing NH_3 Emissions

机译：美国当前和未来的气溶胶pH和组成对减少SO_2排放和增加NH_3排放的响应

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摘要

Aerosol pH can affect gas-particle partitioning of semivolatile species, secondary aerosol formation, aerosol water uptake and growth, acid deposition, and, potentially, aerosol toxicity. Despite its importance, aerosol pH projected in the near future has not been addressed explicitly while investigating the response of aerosol concentrations to emission regulations. In this study, we apply CMAQ to simulate aerosol pH in 2011 and 2050 across the continental U.S. We also assess the influence of two major emission trends, declining SO2 emissions and rising NH3 emissions, with a set of sensitivity simulations. Our results show that the aerosols will remain acidic with average pH typically ranging from 0.5 to 3.5 in 2050. Further reducing domestic SO2 emissions does not significantly decrease aerosol acidity, even if SO2 emissions were reduced to preindustrial levels because of the nonlinear response of SO42- concentration to SO2 emissions, and the semivolatile NH3-NH4+ buffering effect. Aerosol pH response to NH3 emission increase will remain minor. Consequently, future fine particulate matter control efficiency will not be undercut by additional nitrate aerosol formation even if SO2 emissions from industry and electricity generation are aggressively controlled, although areas will see some substitution leading to nitrate increases if NOx emissions are not reduced.
机译：气溶胶的pH值会影响半挥发性物质在气体颗粒中的分配，二次气溶胶的形成，气溶胶水的吸收和生长，酸沉降以及潜在的气溶胶毒性。尽管其重要性，但在调查气溶胶浓度对排放法规的响应时，尚未明确解决不久的将来预测的气溶胶pH。在这项研究中，我们使用CMAQ来模拟美国大陆2011年和2050年的气溶胶pH。我们还通过一组敏感性模拟评估了两种主要排放趋势（SO2排放下降和NH3排放上升）的影响。我们的结果表明，到2050年，气溶胶将保持酸性，平均pH通常在0.5至3.5之间。即使由于SO42-的非线性响应而将SO2排放降低至工业化前水平，进一步减少国内SO2排放也不会显着降低气溶胶酸性。浓度对SO2排放的影响，以及半挥发性NH3-NH4 +的缓冲作用。气溶胶的pH对NH3排放增加的响应将保持很小。因此，即使积极控制来自工业和电力生产的SO2排放，未来的细颗粒物控制效率也不会因硝酸盐气溶胶的形成而受到削弱，尽管如果不减少NOx的排放，某些地区将导致硝酸盐的增加，从而导致硝酸盐的增加。

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  • 来源
    《Environmental Science & Technology》 |2019年第16期|9646-9655|共10页
  • 作者

    Chen Yilin; Shen Huizhong; Russell Armistead G.;

  • 作者单位

    Georgia Inst Technol Sch Civil & Environm Engn Atlanta GA 30332 USA;

  • 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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