globalchange  > 影响、适应和脆弱性
DOI: 10.1002/2016JD025252
论文题名:
A conceptual framework for mixing structures in individual aerosol particles
作者: Li W.; Sun J.; Xu L.; Shi Z.; Riemer N.; Sun Y.; Fu P.; Zhang J.; Lin Y.; Wang X.; Shao L.; Chen J.; Zhang X.; Wang Z.; Wang W.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2016
卷: 121, 期:22
起始页码: 784
结束页码: 798
语种: 英语
英文关键词: individual particle ; morphological mixing state
Scopus关键词: aerosol ; atmospheric pollution ; conceptual framework ; dehydration ; dust ; hydration ; hygroscopicity ; mixing ratio ; particle size ; particulate matter ; physicochemical property ; pollutant source ; sea salt
英文摘要: This study investigated the particle size- and age-dependent mixing structures of individual particles in clean and polluted air. Aerosols were classified into eight components: sea salt, mineral dust, fly ash, metal, soot, sulfates, nitrates, and organic matter (OM). Based on our aerosol classification, a particle that consists of two or more aerosol components can be defined as an internally mixed particle. Otherwise, it is considered to be an externally mixed particle. Within the internally mixed particle class, we identified four heterogeneous mixing structures: core-shell, dumbbell, OM coating, and dispersed OM, as well as one homogeneous-like mixing structure. Homogeneous-like mixing mainly occurred in fine particles (<1 µm), while the frequency of heterogeneously mixed particles increased with particle size. Our study demonstrated that particle mixing structures depend on particle size and location and evolve with time. OM-coating and core-shell structures are important indicators for particle aging in air as long as they are distant from specific emission sources. Long-range transported particles tended to have core-shell and OM-coating structures. We found that secondary aerosol components (e.g., sulfates, nitrates, and organics) determined particle mixing structures, because their phases change following particle hydration and dehydration under different relative humidities. Once externally mixed particles are transformed into internally mixed particles, they cannot revert to their former state, except when semivolatile aerosol components are involved. Categorizing mixing structures of individual particles is essential for studying their optical and hygroscopic properties and for tracing the development of their physical or chemical properties over time. ©2016. American Geophysical Union. All Rights Reserved.
资助项目: 41575116 ; 41622504
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62809
Appears in Collections:影响、适应和脆弱性
气候减缓与适应

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作者单位: Environment Research Institute, Shandong University, Jinan, China; School of Geography, Earth and Environmental Sciences, University of Birmingham, Birmingham, United Kingdom; Department for Atmospheric Sciences, University of Illinois at Urbana-Champaign, Champaign, IL, United States; State Key of Laboratory of Atmospheric Boundary Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China; Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China; State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Beijing, China; Key Laboratory of Atmospheric Chemistry, Chinese Academy of Meteorological Sciences, Beijing, China

Recommended Citation:
Li W.,Sun J.,Xu L.,et al. A conceptual framework for mixing structures in individual aerosol particles[J]. Journal of Geophysical Research: Atmospheres,2016-01-01,121(22)
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