globalchange  > 气候减缓与适应
DOI: 10.1038/ngeo2665
论文题名:
High aerosol acidity despite declining atmospheric sulfate concentrations over the past 15 years
作者: Weber R.J.; Guo H.; Russell A.G.; Nenes A.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2016
卷: 9, 期:4
起始页码: 282
结束页码: 285
语种: 英语
Scopus关键词: acidity ; aerosol ; aerosol composition ; ammonium nitrate ; concentration (composition) ; particulate matter ; physicochemical property ; sulfate ; thermodynamics ; United States
英文摘要: Particle acidity affects aerosol concentrations, chemical composition and toxicity. Sulfate is often the main acid component of aerosols, and largely determines the acidity of fine particles under 2.5 μm in diameter, PM2.5. Over the past 15 years, atmospheric sulfate concentrations in the southeastern United States have decreased by 70%, whereas ammonia concentrations have been steady. Similar trends are occurring in many regions globally. Aerosol ammonium nitrate concentrations were assumed to increase to compensate for decreasing sulfate, which would result from increasing neutrality. Here we use observed gas and aerosol composition, humidity, and temperature data collected at a rural southeastern US site in June and July 2013 (ref.), and a thermodynamic model that predicts pH and the gas-particle equilibrium concentrations of inorganic species from the observations to show that PM2.5 at the site is acidic. pH buffering by partitioning of ammonia between the gas and particle phases produced a relatively constant particle pH of 0-2 throughout the 15 years of decreasing atmospheric sulfate concentrations, and little change in particle ammonium nitrate concentrations. We conclude that the reductions in aerosol acidity widely anticipated from sulfur reductions, and expected acidity-related health and climate benefits, are unlikely to occur until atmospheric sulfate concentrations reach near pre-anthropogenic levels. © 2016 Macmillan Publishers Limited. All rights reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106047
Appears in Collections:气候减缓与适应
科学计划与规划

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作者单位: School of Earth and Atmospheric Sciences, Georgia Institute of Technology, 311 Ferst Drive, Atlanta, GA, United States; School of Civil and Environmental Engineering, Georgia Institute of Technology, 311 Ferst Drive, Atlanta, GA, United States; School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, 311 Ferst Drive, Atlanta, GA, United States; Institute of Chemical Engineering Sciences, Foundation for Research and Technology - Hellas, PO Box 1414, Platani, Patras, Greece; Institute for Environmental Research and Sustainable Development, National Observatory of Athens, Palea Penteli, Greece

Recommended Citation:
Weber R.J.,Guo H.,Russell A.G.,et al. High aerosol acidity despite declining atmospheric sulfate concentrations over the past 15 years[J]. Nature Geoscience,2016-01-01,9(4)
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