DOI: 10.1016/j.atmosenv.2014.01.032
Scopus记录号: 2-s2.0-84896821194
论文题名: Photochemical evolution of organic aerosols observed in urban plumes from Hong Kong and the Pearl River Delta of China
作者: Zhou S ; , Wang T ; , Wang Z ; , Li W ; , Xu Z ; , Wang X ; , Yuan C ; , Poon C ; N ; , Louie P ; K ; K ; , Luk C ; W ; Y ; , Wang W
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2014
卷: 88 起始页码: 219
结束页码: 229
语种: 英语
英文关键词: Carbonaceous aerosols
; Individual aerosol particles
; Photochemical evolution
; PM2.5
; Secondary organic aerosol
Scopus关键词: Aerosol particles
; Carbonaceous aerosol
; Microscopic analysis
; Photochemical activity
; Photochemical evolution
; Physicochemical property
; Secondary organic aerosols
; Secondary organic carbons (SOC)
; Atmospheric radiation
; Organic coatings
; Aerosols
; carbon
; element carbon
; organic carbon
; oxygen
; sulfate
; unclassified drug
; aerosol composition
; aging
; atmospheric plume
; coating
; concentration (composition)
; outflow
; photochemistry
; physicochemical property
; sulfate
; air pollution
; article
; autumn
; China
; circadian rhythm
; concentration (parameters)
; Hong Kong
; Mexico
; night
; particle size
; particulate matter
; photochemistry
; physical chemistry
; plume
; priority journal
; seasonal variation
; secondary organic aerosol
; spring
; summer
; United States
; urban area
; winter
; China
; Guangdong
; Hong Kong
; Zhujiang Delta
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: Organic aerosols influence human health and global radiative forcing. However, their sources and evolution processes in the atmosphere are not completely understood. To study the aging and production of organic aerosols in a subtropical environment, we measured hourly resolved organic carbon (OC) and element carbon (EC) in PM2.5 at a receptor site (Tung Chung, TC) in Hong Kong from August 2011 to May 2012. The average OC concentrations exhibited the highest values in late autumn and were higher during the daytime than at night. The secondary organic carbon (SOC) concentrations, which were estimated using an EC-tracer method, comprised approximately half of the total OC on average. The SOC showed good correlation with odd oxygen (Ox=O3+NO2) in the summer and autumn seasons, suggestive of contribution of photochemical activities to the formation of secondary organic aerosols (SOA). We calculated production rates of SOA using the photochemical age (defined as -Log10(NOx/NOy)) in urban plumes from the Pearl River Delta (PRD) region and Hong Kong during pollution episodes in summer and autumn. The CO-normalized SOC increased with the photochemical age, with production rates ranging from 1.31 to 1.82μgm-3ppmv-1h-1 in autumn and with a larger rate in summer (3.86μgm-3ppmv-1h-1). The rates are in the range of the rates observed in the outflow from Mexico City, the eastern U.S. and Los Angeles. Microscopic analyses of the individual aerosol particles revealed large contrasts of aerosol physico-chemical properties on clean and smoggy days, with thick organic coatings internally mixed with inorganic sulfate for all particle sizes in the aged plumes from the PRD region. © 2014 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/80689
Appears in Collections: 气候变化事实与影响
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作者单位: Environment Research Institute, Shandong University, Ji'nan, Shandong 250100, China; Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong; Environmental Protection Department, Government of the Hong Kong Special Administrative Region, Hong Kong; Chinese Research Academy of Environmental Sciences, Beijing 100012, China
Recommended Citation:
Zhou S,, Wang T,, Wang Z,et al. Photochemical evolution of organic aerosols observed in urban plumes from Hong Kong and the Pearl River Delta of China[J]. Atmospheric Environment,2014-01-01,88