DOI: 10.1016/j.atmosenv.2014.04.007
Scopus记录号: 2-s2.0-84898918068
论文题名: A multi-year evolution of aerosol chemistry impacting visibility and haze formation over an Eastern Asia megacity, Shanghai
作者: Lin Y ; , Huang K ; , Zhuang G ; , Fu J ; S ; , Wang Q ; , Liu T ; , Deng C ; , Fu Q
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2014
卷: 92 起始页码: 76
结束页码: 86
语种: 英语
英文关键词: Aerosol evolution
; Ammonium salts
; Chemical species
; Haze
; Visibility trend
Scopus关键词: Aerosols
; Calcium
; Sulfur dioxide
; Ammonium salt
; Chemical species
; Construction works
; Haze
; Horizontal visibility
; Quantitative correlation
; Visibility impairment
; Water-soluble ions
; Visibility
; ammonia
; ammonium nitrate
; ammonium sulfate
; black carbon
; calcium
; carbon monoxide
; nitrate
; nitrogen dioxide
; potassium
; sulfur dioxide
; aerosol
; atmospheric pollution
; black carbon
; calcium
; concentration (composition)
; emission
; haze
; inorganic salt
; oxide
; seasonal variation
; visibility
; aerosol
; air pollution
; air quality
; article
; autumn
; biomass
; chemical analysis
; chemistry
; China
; construction work
; control strategy
; dust
; evolution
; haze
; human
; meteorology
; population density
; priority journal
; seasonal variation
; spring
; summer
; visibility
; winter
; China
; Shanghai
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: A multi-year (2004-2008) study of horizontal visibility and factors controlling its variations was conducted in Shanghai. The seasonal average visibility in spring, summer, autumn, and winter was 7.7km, 8.4km, 8.1km, and 6.5km, respectively, significantly exceeding the haze criteria of 10km throughout all four seasons. Although SO2 and NO2 concentrations gradually shifted to lower levels on an annual basis, no distinct improvement of the annual mean visibility was noticed. Via a grouping method, it was found that the water soluble ions and black carbon were the major contributors to haze formation while the role of mineral aerosol was negligible. Of the ions, SO4 2-, NO3 -, NH4 +, K+, and C2O4 2- were most associated with the formation of heavy haze. SO4 2- and NO3 - were both found to have significant decreasing trends with annual decreasing rates of 0.96 and 0.56μg/m3/yr, respectively. Conversely, NH4 + showed a significant increasing trend with the annual increasing rate of 0.52μg/m3/yr. Based on a quantitative correlation analysis, the roles of NH4 + and Ca2+ on the acids neutralization were almost equivalent in the earlier years of 2004-2005. While the role of Ca2+ had tremendously dropped to less than 23% in the later years of 2006-2008. Intense control measures on the emissions of construction works and roadside dust were the main driving force for the evident decreasing trend of annual Ca2+ concentrations. This study found that the gradual replacement of CaSO4 and Ca(NO3)2 by (NH4)2SO4 and NH4NO3 in aerosol was the major cause of no improvement of the visibility impairment in Shanghai during recent years. © 2014 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/81315
Appears in Collections: 气候变化事实与影响
There are no files associated with this item.
作者单位: Center for Atmospheric Chemistry Study, Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, China; Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention (Lap), Shanghai 200433, China; Department of Civil and Environmental Engineering, The University of Tennessee, Knoxville, TN 37996, United States; Shanghai Environmental Monitoring Center, Shanghai 200030, China
Recommended Citation:
Lin Y,, Huang K,, Zhuang G,et al. A multi-year evolution of aerosol chemistry impacting visibility and haze formation over an Eastern Asia megacity, Shanghai[J]. Atmospheric Environment,2014-01-01,92