DOI: 10.1016/j.atmosenv.2017.07.009
Scopus记录号: 2-s2.0-85024503990
论文题名: Size distributions of hydrophilic and hydrophobic fractions of water-soluble organic carbon in an urban atmosphere in Hong Kong
作者: Wang N ; , Yu J ; Z
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2017
卷: 166 起始页码: 110
结束页码: 119
语种: 英语
英文关键词: HULIS
; Hydrophilic WSOC
; Size distribution
; Urban Hong Kong
Scopus关键词: Aerosols
; Budget control
; Condensation
; Drops
; Hydrophilicity
; Hydrophobicity
; Organic carbon
; Particulate emissions
; Size distribution
; Hong-kong
; HULIS
; Hydrophilic and hydrophobic
; Hydrophilic WSOC
; Mass median aerodynamic diameters
; Solid-phase extraction
; Visibility degradation
; Water-soluble organic carbon
; Urban growth
; ion
; organic carbon
; sulfate
; aerosol
; aerosol property
; biomass burning
; chemical property
; coagulation
; concentration (composition)
; condensation
; degradation
; extraction method
; hydrophobicity
; organic carbon
; radiation budget
; sampler
; seasonal variation
; solubility
; urban atmosphere
; urban site
; aerosol
; Article
; atmosphere
; biomass
; combustion
; correlation analysis
; degradation
; Hong Kong
; hydrophilicity
; hydrophobicity
; particle size
; polymerization
; priority journal
; radiation
; sea
; seasonal variation
; soil
; solid phase extraction
; urban area
; visibility
; China
; Hong Kong
Scopus学科分类: Environmental Science: Water Science and Technology
; Earth and Planetary Sciences: Earth-Surface Processes
; Environmental Science: Environmental Chemistry
英文摘要: Water-soluble organic carbon (WSOC) is a significant part of ambient aerosol and plays an active role in contributing to aerosol's effect on visibility degradation and radiation budget through its interactions with atmospheric water. Size-segregated aerosol samples in the range of 0.056–18 μm were collected using a ten-stage impactor sampler at an urban site in Hong Kong over one-year period. The WSOC samples were separated into hydrophilic (termed WSOC_h) and hydrophobic fractions (i.e., the humic-like substances (HULIS) fraction) through solid-phase extraction procedure. Carbon in HULIS accounted for 40 ± 14% of WSOC. The size distribution of HULIS was consistently characterized in all seasons with a dominant droplet mode (46–71%) and minor condensation (9.0–18%) and coarse modes (20–35%). The droplet mode had a mass median aerodynamic diameter in the range of 0.7–0.8 μm. This size mode showed the largest seasonal variation in abundance, lowest in the summer (0.41 μg/m3) and highest in the winter (3.3 μg/m3). WSOC_h also had a dominant droplet mode, but was more evenly distributed among different size modes. Inter-species correlations within the same size mode suggest that the condensation-mode HULIS was partly associated with combustion sources and the droplet-mode was strongly associated with secondary sulfate formation and biomass burning particle aging processes. There is evidence to suggest that the coarse-mode HULIS largely originated from coagulation of condensation-mode HULIS with coarse soil/sea salt particles. The formation process and possible sources of WSOC_h was more complicated and multiple than HULIS and need further investigation. Our measurements indicate that WSOC components contributed a dominant fraction of water-soluble aerosol mass in particles smaller than 0.32 μm while roughly 20–30% in the larger particles. © 2017 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/82422
Appears in Collections: 气候变化事实与影响
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作者单位: Fok Ying Tung Graduate School, Hong Kong University of Science & Technology, China; Department of Chemistry and Division of Environment, Hong Kong University of Science & Technology, China
Recommended Citation:
Wang N,, Yu J,Z. Size distributions of hydrophilic and hydrophobic fractions of water-soluble organic carbon in an urban atmosphere in Hong Kong[J]. Atmospheric Environment,2017-01-01,166