DOI: 10.1002/jgrd.50658
论文题名: Physical and chemical characterization of ambient aerosol by HR-ToF-AMS at a suburban site in Hong Kong during springtime 2011
作者: Lee B.P. ; Li Y.J. ; Yu J.Z. ; Louie P.K.K. ; Chan C.K.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 15 起始页码: 8625
结束页码: 8639
语种: 英语
英文关键词: AMS
; suburban aerosol
Scopus关键词: Particle size
; Particle size analysis
; Pollution
; River pollution
; AMS
; Back trajectory analysis
; Bimodal particle size distribution
; Chemical characterization
; Pearl River Delta region
; Semivolatile organic aerosols
; Time-of-flight aerosol mass spectrometers
; Vacuum aerodynamic diameters
; Aerosols
; accelerator mass spectrometry
; aerosol
; air mass
; atmospheric pollution
; chemical composition
; coastal zone
; concentration (composition)
; humid environment
; meteorology
; oxidation
; particle size
; photochemistry
; real time
; sampling
; size distribution
; suburban area
; sulfate
; trajectory
; volatile organic compound
; China
; Guangdong
; Hong Kong
; Zhujiang Delta
英文摘要: An Aerodyne high-resolution time-of-flight aerosol mass spectrometer (HR-ToF-AMS) has been employed in a field sampling campaign at a suburban coastal site in Hong Kong in springtime 2011 to provide insights into the size-resolved chemical composition of nonrefractory submicron aerosol species. This is the first time that such detailed real-time measurements have been made in Hong Kong. The total nonrefractory PM1 was dominated by sulfate (51.0%) and organics (28.2%) with considerable acidity (average in situ pH = 0.95) and a characteristic bimodal particle size distribution with peaks at 200 and 570 nm of vacuum aerodynamic diameter (Dva ). Source apportionment of organic aerosol yielded three characteristic aerosol fractions (hydrocarbon-like organic aerosol, semivolatile organic aerosol and low-volatile organic aerosol) with distinct temporal patterns and distributions in different particle size regions. The influence of air mass origin on species concentrations, particle size distributions and elemental ratios was investigated using backtrajectory analysis. Larger particle diameters, greater fractions of oxygenated organic aerosol and higher organic-to-carbon ratios were observed during coastal and continental air mass influence. Three major pollution events with elevated nonrefractory PM1 concentrations were observed in the sampling period, which were related to distinct meteorological and circulatory conditions. Accumulation and redistribution of local and regional pollutants were notable in a period of strong land-sea breeze over the Pearl River Delta region, with considerable photochemical activity and particle aging. Increased fractions of oxygenated organic aerosol were apparent in foggy conditions, illustrating the importance of aqueous phase oxidation processes in a cooler and more humid time period. Key Points Suburban aerosol in Hong Kong is characterized by HR-ToF-AMS in real time An inter-instrumental comparison with MARGA and ECOC analyzer is presented Influence of air mass origin and episodic events on PM composition is discussed ©2013. American Geophysical Union. All Rights Reserved. 资助项目: SEG-HKUST07
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63475
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: Division of Environment, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong; Department of Chemistry, Hong Kong University of Science and Technology, Kowloon, Hong Kong; Environmental Protection Department, Wan Chai, Hong Kong; Institute for the Environment, Hong Kong University of Science and Technology, Kowloon, Hong Kong; Department of Chemical and Biomolecular Engineering, Hong Kong University of Science and Technology, Kowloon, Hong Kong
Recommended Citation:
Lee B.P.,Li Y.J.,Yu J.Z.,et al. Physical and chemical characterization of ambient aerosol by HR-ToF-AMS at a suburban site in Hong Kong during springtime 2011[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(15)