DOI: 10.1016/j.atmosenv.2015.03.037
Scopus记录号: 2-s2.0-84925392691
论文题名: Aerosol chemical composition and light scattering during a winter season in Beijing
作者: Tao J ; , Zhang L ; , Gao J ; , Wang H ; , Chai F ; , Wang S
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2015
卷: 110 起始页码: 36
结束页码: 44
语种: 英语
英文关键词: Aerosol size distribution
; Biomass burning
; Hygroscopic growth
; PM2.5
; Visibility degradation
Scopus关键词: Aerosols
; Air quality
; Chemical compounds
; Degradation
; Light scattering
; Linear regression
; Pollution
; Urban growth
; Visibility
; Water pollution
; Aerosol chemical composition
; Aerosol scattering coefficient
; Aerosol size distributions
; Biomass-burning
; Hygroscopic growth
; Mass scattering efficiency
; Multiple linear regression equations
; Visibility degradation
; Air pollution
; aerosol property
; chemical composition
; concentration (composition)
; correlation
; dominance
; light scattering
; winter
; aerosol
; air pollution
; Article
; chemical composition
; China
; gravimetry
; light scattering
; meteorology
; particulate matter
; priority journal
; wettability
; winter
; Beijing [China]
; China
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: To evaluate PM2.5 contributions to light scattering under different air pollution levels, PM2.5 and its major chemical components, PM10 , size-segregated water-soluble ions, and aerosol scattering coefficient (bsp ) under dry conditions were measured at an urban site in Beijing in January 2013 when heavy pollution events frequently occurred. Measurements were categorized into three pollution levels including heavy-polluted (Air Quality Index (AQI)200), light-polluted (200>AQI≥100) and clean periods (AQI<100). The average PM2.5 mass concentration was 248μgm-3 during the heavy-polluted period, which was 2.4 and 5.6 times of those during the light-polluted (104μgm-3) and clean (44μgm-3) periods, respectively. The concentrations of SO4 2-, NO3 - and NH4 + increased much more than those of OC and EC during the heavy-polluted period compared with those during the light-polluted and clean periods. Good correlations between PM2.5 and bsp were found (R2>0.95) during the different pollution levels. The mass scattering efficiency (MSE) of PM2.5 was 4.9m2g-1 during the heavy-polluted period, which was higher than those during the light-polluted (4.3m2g-1) and clean periods (3.6m2g-1). To further evaluate the impact of individual chemical components of PM2.5 on light scattering, a multiple linear regression equation of measured bsp against the mass concentration of (NH4 )2 SO4 , NH4 NO3 , Organic Matter (OM), EC, Fine Soil (FS), Coarse Matter (CM) and Other chemical compounds were performed. (NH4 )2 SO4 , NH4 NO3 and OM were the dominant species contributing to bsp under both dry and ambient conditions. OM contributed more to bsp than the sum of (NH4 )2 SO4 and NH4 NO3 did under the dry condition during all the pollution periods and this was also the case under the ambient condition during the light-polluted and clean periods. However, the total contributions of (NH4 )2 SO4 and NH4 NO3 to bsp under the ambient condition was 55%, much more than the 29% contribution from OM during the heavy-polluted period. High (NH4 )2 SO4 and NH4 NO3 concentrations and their hygroscopicity were the main reasons causing visibility degradation during the heavy-polluted period, and the effect can be enhanced under high RH conditions. © 2015. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/81771
Appears in Collections: 气候变化事实与影响
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作者单位: State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, China; Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Nanjing, China; Air Quality Research Division, Science Technology Branch, Environment Canada, Toronto, Canada; South China Institute of Environmental Sciences, Ministry of Environmental Protection, Guangzhou, China
Recommended Citation:
Tao J,, Zhang L,, Gao J,et al. Aerosol chemical composition and light scattering during a winter season in Beijing[J]. Atmospheric Environment,2015-01-01,110