globalchange  > 气候减缓与适应
DOI: 10.1002/2017JD027264
Scopus记录号: 2-s2.0-85040863917
论文题名:
Key Role of Nitrate in Phase Transitions of Urban Particles: Implications of Important Reactive Surfaces for Secondary Aerosol Formation
作者: Sun J.; Liu L.; Xu L.; Wang Y.; Wu Z.; Hu M.; Shi Z.; Li Y.; Zhang X.; Chen J.; Li W.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2018
卷: 123, 期:2
起始页码: 1234
结束页码: 1243
语种: 英语
英文关键词: deliquescence relative humidity ; haze formation ; heterogeneous reaction ; hygroscopicity ; individual particles
Scopus关键词: aerosol formation ; ammonium nitrate ; ammonium sulfate ; dehydration ; haze ; heterogeneity ; humidity ; hygroscopicity ; nitrate ; particle size ; reactive transport ; relative humidity ; urban area ; China
英文摘要: Ammonium sulfate (AS) and ammonium nitrate (AN) are key components of urban fine particles. Both field and model studies showed that heterogeneous reactions of SO2, NO2, and NH3 on wet aerosols accelerated the haze formation in northern China. However, little is known on phase transitions of AS-AN containing haze particles. Here hygroscopic properties of laboratory-generated AS-AN particles and individual particles collected during haze events in an urban site were investigated using an individual particle hygroscopicity system. AS-AN particles showed a two-stage deliquescence at mutual deliquescence relative humidity (MDRH) and full deliquescence relative humidity (DRH) and three physical states: solid before MDRH, solid-aqueous between MDRH and DRH, and aqueous after DRH. During hydration, urban haze particles displayed a solid core and aqueous shell at RH = 60–80% and aqueous phase at RH > 80%. Most particles were in aqueous phase at RH > 50% during dehydration. Our results show that AS content in individual particles determines their DRH and AN content determines their MDRH. AN content increase can reduce MDRH, which indicates occurrence of aqueous shell at lower RH. The humidity-dependent phase transitions of nitrate-abundant urban particles are important to provide reactive surfaces of secondary aerosol formation in the polluted air. ©2018. American Geophysical Union. 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/114672
Appears in Collections:气候减缓与适应

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作者单位: Department of Atmospheric Sciences, School of Earth Sciences, Zhejiang University, Hangzhou, Zhejiang, China; Environment Research Institute, Shandong University, Jinan, Shandong, China; State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing, China; School of Geography, Earth and Environmental Sciences, University of Birmingham, Birmingham, United Kingdom; Department of Civil and Environmental Engineering, Faculty of Science and Technology, University of Macau, Taipa, Macau; Key Laboratory of Atmospheric Chemistry of CMA, Institute of Atmospheric Composition, Chinese Academy of Meteorological Sciences, Beijing, China; Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention, Department of Environmental Science and Engineering, Fudan University, Shanghai, China

Recommended Citation:
Sun J.,Liu L.,Xu L.,et al. Key Role of Nitrate in Phase Transitions of Urban Particles: Implications of Important Reactive Surfaces for Secondary Aerosol Formation[J]. Journal of Geophysical Research: Atmospheres,2018-01-01,123(2)
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