DOI: 10.1016/j.atmosenv.2017.12.031
Scopus记录号: 2-s2.0-85040656688
论文题名: Secondary inorganic aerosols formation during haze episodes at an urban site in Beijing, China
作者: Zhang R ; , Sun X ; , Shi A ; , Huang Y ; , Yan J ; , Nie T ; , Yan X ; , Li X
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2018
卷: 177 起始页码: 275
结束页码: 282
语种: 英语
英文关键词: Haze
; Nitrate
; PM2.5
; Secondary formation
; Sulfate
Scopus关键词: Nitrates
; Nitrogen oxides
; Oxidation
; Photochemical reactions
; Pollution
; Pollution control
; Sulfur compounds
; Aqueous phase oxidations
; Haze
; PM2.5
; Secondary formation
; Secondary inorganic aerosol
; Secondary transformation
; Sulfate
; Time resolved measurement
; Urban growth
; ammonia
; calcium ion
; chloride
; magnesium ion
; nitrate
; potassium ion
; sodium ion
; sulfate
; aerosol
; aerosol formation
; atmospheric pollution
; concentration (composition)
; haze
; neutralization
; nitrate
; nitric oxide
; oxidation
; relative humidity
; sulfate
; temperature effect
; traffic emission
; urban site
; air pollution
; air quality standard
; air sampling
; Article
; China
; haze
; humidity
; oxidation
; particulate matter
; priority journal
; urban area
; 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: Severe PM2.5 pollution was observed frequently in Beijing. We conducted highly time-resolved measurements of inorganic ions associated with PM2.5 at an urban site in Beijing from 10 February to 19 March, 2015. The average PM2.5 mass concentrations during the six haze episodes ranged from 113.0 μg/m3 to 182.6 μg/m3, which were more than 8 times higher than those observed in clean periods. The secondary inorganic species (NH4 +, SO4 2− and NO3 −) in PM2.5 sharply increased during the haze episodes, indicating more extensive formation of SO4 2− and NO3 −. The sulfur oxidation ratios (SOR) and the nitrogen oxidation ratios (NOR) in haze episodes were higher than those in clean periods, which indicated that secondary transformation in haze episodes was more significant than those in clean periods. No correlations between SOR and the oxidants (O3 and HONO) and the temperature were found, whereas a high correlation between SOR and relative humidity (RH) was found in haze episodes, which implied that sulfate was mainly produced by the aqueous-phase oxidation of SO2 rather than the gas-phase conversion of SO2 to sulfate. The conversion of SO2 to SO4 2− was observed to be sensitive to changes in RH. Furthermore, the SOR sharply increased at RH > 60% with the highest value of 0.88 at RH around 80% during complicated pollution. NO2 played an important role in the rapid sulfate formation with high RH and NH3 neutralization conditions in haze episodes in Beijing. The impact of RH was less apparent for nitrate than for sulfate. Nitrate was found to be produced mainly by photochemical and heterogeneous reactions, while heterogeneous reactions had a greater influence on NOR at nighttime. The NO3 −/SO4 2− ratio indicated that mobile sources contributed more to the formation of PM2.5 than stationary sources. The result suggested the need for control of vehicle emissions to reduce the high levels of NOx and nitrate and the severe PM2.5 pollution in Beijing. © 2017 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83047
Appears in Collections: 气候变化事实与影响
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作者单位: National Engineering Research Center of Urban Environmental Pollution Control, Municipal Research Institute of Environmental Protection, Beijing, China
Recommended Citation:
Zhang R,, Sun X,, Shi A,et al. Secondary inorganic aerosols formation during haze episodes at an urban site in Beijing, China[J]. Atmospheric Environment,2018-01-01,177