DOI: 10.1016/j.atmosenv.2020.117408
论文题名: Online measurement of carbonaceous aerosols in suburban Shanghai during winter over a three-year period: Temporal variations, meteorological effects, and sources
作者: Yao L. ; Huo J. ; Wang D. ; Fu Q. ; Sun W. ; Li Q. ; Chen J.
刊名: Atmospheric Environment
ISSN: 1352-2310
出版年: 2020
卷: 226 语种: 英语
英文关键词: Aerosols
; Coal combustion
; Vehicles
; Elemental carbon
; Meteorological condition
; Meteorological effects
; PM2.5
; Primary organic carbons
; Secondary organic carbons (SOC)
; Temporal variation
; Vehicle emission
; Organic carbon
; carbon
; coal
; nitric oxide
; organic carbon
; aerosol
; biomass burning
; chemical element
; coal combustion
; concentration (composition)
; measurement method
; meteorology
; organic carbon
; particulate matter
; pollutant source
; pollution effect
; suburban area
; temporal variation
; traffic emission
; winter
; adverse event
; aerosol
; air pollution control
; Article
; carbonaceous aerosol
; circadian rhythm
; climate change
; exhaust gas
; human
; measurement accuracy
; meteorology
; online analysis
; priority journal
; seasonal variation
; secondary organic aerosol
; suburban area
; winter
; China
; Shanghai
学科: Elemental carbon
; Organic carbon
; PM2.5
; Temporal variations
; Vehicle emissions
中文摘要: Carbonaceous aerosols have adverse effects on both human health and the climate. To understand the temporal variations and sources of carbonaceous aerosols, organic carbon (OC) and elemental carbon (EC) were measured hourly in suburban Shanghai in 2015–2017 during winter. The average OC concentrations were 7.34 ± 4.51 μgC/m3 in 2015, 7.16 ± 4.43 μgC/m3 in 2016, and 6.4 ± 3.22 μgC/m3 in 2017. The EC concentrations decreased significantly each year, with average concentrations of 3.82 ± 2.43, 2.91 ± 2.28, and 2.46 ± 1.88 μgC/m3, respectively, which caused the OC/EC ratio to increase from 2015 to 2017. Although the meteorological conditions differed each winter, there was a similar pattern of OC and EC diurnal variations, with concentrations peaking at 08:00 and 20:00, largely due to rush-hour vehicle emissions. A downward trend of EC/CO and EC/NO2 (mass ratios) but steady CO and NO2 concentrations from 2015 to 2017 revealed that the characteristics of primary vehicle emissions changed, and that less EC was emitted. Secondary organic carbon (SOC) and primary organic carbon (POC) were estimated with the minimum R2 (MRS) method. The hiemal SOC/OC values in suburban Shanghai were 19.2 ± 18.6% in 2015, 31.1 ± 18.6% in 2016, and 51.0 ± 21.4% in 2017, exhibiting an increasing trend. As the PM2.5 concentration increased (from 0 to 50 μg/m3 to 100–300 μg/m3), a decreasing SOC/OC ratio (from 43.6 ± 23.9% to 21.8 ± 17.7%) was observed over the three years, showing that primary emissions were the main contributors to carbonaceous aerosols on haze days. Case analysis of haze events further demonstrated that the primary sources of OC and EC were vehicle emissions. The contributions of biomass burning and coal combustion to carbonaceous aerosols became less important over the study period. This study highlights the importance of controlling vehicle emissions to reduce carbonaceous aerosol concentrations in the suburbs of the Chinese megacity, Shanghai. © 2020 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/160415
Appears in Collections: 气候变化与战略
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作者单位: Department of Environmental Engineering, School of Environmental and Geographical Science, Shanghai Normal University, Shanghai, 200234, China; Shanghai Environmental Monitoring Center, Shanghai, 200235, China; Department of Environmental Science & Engineering, Fudan University, Shanghai, 200438, China; Institute of Eco-Chongming, 3663 Zhongshan Road, Shanghai, 200062, China; Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, China
Recommended Citation:
Yao L.,Huo J.,Wang D.,et al. Online measurement of carbonaceous aerosols in suburban Shanghai during winter over a three-year period: Temporal variations, meteorological effects, and sources[J]. Atmospheric Environment,2020-01-01,226