Chemical Composition and Light Extinction Contribution of PM2.5 in Urban Beijing for a 1-Year Period | |
Chang, Qing4; Cao, Junji3; Ma, Yongliang2; Yang, Fumo1; He, Kebin2; Wang, Huanbo1; Tian, Mi1; Li, Xinghua4 | |
刊名 | AEROSOL AND AIR QUALITY RESEARCH |
2015-11-01 | |
卷号 | 15期号:6页码:2200-2211 |
关键词 | Chemical Composition Reconstructed Light Extinction Coefficient Visibility Pm2.5 |
DOI | 10.4209/aaqr.2015.04.0257 |
文献子类 | Article |
英文摘要 | Daily PM2.5 samples were collected in Beijing across four consecutive seasons from June 2012 to April 2013. Major water-soluble inorganic ions, carbonaceous species and elements were analyzed to investigate their temporal variations and evaluate their contributions to visibility impairment over different seasons and under different pollution levels. The mass concentrations of PM2.5 ranged from 4.3 to 592.4 mu g m(-3), with an annual average of 112.4 +/- 94.4 mu g m(-3). The predominant components of PM2.5 were secondary inorganic ions (NH4+, NO3- and SO42-) and carbonaceous compounds, which accounted for 45.9% and 24.1% of the total PM2.5 mass, respectively. Distinct seasonal variation was observed in the mass concentrations and chemical components of PM2.5. The average mass concentrations of PM2.5 were the highest in winter, followed by spring, and lowest in autumn. Light extinction coefficients (b(ext)) were discussed over four seasons. (NH4)(2)SO4 was the largest contributor (28.8%) to bext, followed by NH4NO3 (24.4%), organic matter (19.5%), elemental carbon (7.4%), and coarse mass (7.2%), while fine soil, sea salt, NO2 and Rayleigh made minor contributions, together accounting for 12.7% of b(ext). During the polluted periods, the contributions of (NH4)(2)SO4 and NH4NO3 to bext increased dramatically. Therefore, in addition to control primary particulate emissions, the reduction of their precursors like SO2, NOx and NH3 could effectively improve air quality and visibility in Beijing. |
WOS关键词 | Airborne Particulate Matters ; Secondary Organic-carbon ; Source Apportionment ; Air-pollution ; Visibility Impairment ; Size Distribution ; China ; Aerosol ; Winter ; Speciation |
WOS研究方向 | Environmental Sciences & Ecology |
语种 | 英语 |
WOS记录号 | WOS:000363396200003 |
内容类型 | 期刊论文 |
源URL | [http://ir.ieecas.cn/handle/361006/5060] |
专题 | 地球环境研究所_粉尘与环境研究室 |
作者单位 | 1.Chinese Acad Sci, Chongqing Inst Green & Intelligent Technol, Key Lab Reservoir Aquat Environm, Chongqing 400714, Peoples R China 2.Tsinghua Univ, Sch Environm, State Environm Protect Key Lab Sources & Control, Beijing 100084, Peoples R China 3.Chinese Acad Sci, Inst Earth Environm, Key Lab Aerosol Chem & Phys, Xian 710075, Peoples R China 4.Beihang Univ, Sch Chem & Environm, Beijing 100191, Peoples R China |
推荐引用方式 GB/T 7714 | Chang, Qing,Cao, Junji,Ma, Yongliang,et al. Chemical Composition and Light Extinction Contribution of PM2.5 in Urban Beijing for a 1-Year Period[J]. AEROSOL AND AIR QUALITY RESEARCH,2015,15(6):2200-2211. |
APA | Chang, Qing.,Cao, Junji.,Ma, Yongliang.,Yang, Fumo.,He, Kebin.,...&Li, Xinghua.(2015).Chemical Composition and Light Extinction Contribution of PM2.5 in Urban Beijing for a 1-Year Period.AEROSOL AND AIR QUALITY RESEARCH,15(6),2200-2211. |
MLA | Chang, Qing,et al."Chemical Composition and Light Extinction Contribution of PM2.5 in Urban Beijing for a 1-Year Period".AEROSOL AND AIR QUALITY RESEARCH 15.6(2015):2200-2211. |
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