DOI: 10.1016/j.atmosenv.2019.117254
论文题名: Seasonal variability of VOCs in Nanjing, Yangtze River delta: Implications for emission sources and photochemistry
作者: Wang M. ; Qin W. ; Chen W. ; Zhang L. ; Zhang Y. ; Zhang X. ; Xie X.
刊名: Atmospheric Environment
ISSN: 1352-2310
出版年: 2020
卷: 223 语种: 英语
英文关键词: Combustion
; Ethylene
; Evaporation
; Factorization
; Free radicals
; Gasoline
; Petrochemicals
; Photochemical reactions
; Solvents
; Urban growth
; Volatile organic compounds
; Average concentration
; Conditional probability function
; Petrochemical industry
; Positive Matrix Factorization
; Relative contribution
; Seasonal variability
; Source apportionment
; Source contributions
; Petrochemical plants
学科: Photochemistry
; Seasonal variability
; Source apportionment
; VOCs
中文摘要: Online measurements of volatile organic compounds (VOCs) during the entire year of 2016 were conducted at an urban site in Nanjing, Jiangsu Province of China. Seasonal variation characteristics in ambient VOCs levels, ratios, and sources were then analyzed to investigate which factors controlled seasonal cycles of VOCs levels during 2016. Impact of photochemistry was evaluated based on monthly average concentrations of OH radical ([OH]) determined by ratios of ethene versus acetylene and o-xylene versus ethylbenzene. [OH] exhibited higher values during summer and lower values during winter, similar with the seasonality of ozone concentrations and ultraviolet radiation, indicating the existence of photochemical influence on VOCs. Further variance analysis on VOCs levels suggested that seasonality of photochemistry played a minor role in explaining VOCs seasonal cycles. Monthly changes in VOCs sources were then analyzed using the Positive Matrix Factorization (PMF) receptor model. Seven factors were identified, including two factors related to traffic emission and other combustion processes (i.e. vehicular exhaust + combustion processes, gasoline evaporation + vehicular exhaust), two factors related to petrochemical industry (i.e. petrochemical industry#1-propane and petrochemical industry#2-propene), two factors attributed to paints and solvents use (i.e. paints and solvents use#1-toluene, paints and solvents use#2-C8 aromatics), and a factor related to biogenic emission. Gasoline evaporation + vehicular exhaust and biogenic emission both exhibited higher relative contributions during summertime. Meanwhile, relative contributions of petrochemical industry and vehicular exhaust + combustion processes showed maximum during winter and minimum during summer. Relative contributions of two factors related to paints and solvents use showed higher values in March–April and August–September. Conditional probability function (CPF) analysis identified the influence of transport on seasonal changes in VOC source contributions. Finally, the PMF results of this study were compared with recent publications. The discrepancy of VOCs sources reported by different studies implied that there is still large uncertainty in our knowledge on VOCs emissions in Nanjing, and therefore further research on evaluation of VOCs emission inventories and source apportionment is needed in future. © 2020 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/160552
Appears in Collections: 气候变化与战略
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作者单位: Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, Nanjing, 210044, China; Jiangsu Environmental Monitoring Center, Nanjing, 210036, China; Jiangsu Environmental Protection Bureau, Nanjing, 210036, China; Nanjing Environmental Monitoring Center, Jiangsu Province, Nanjing, Jiangsu 210013, China
Recommended Citation:
Wang M.,Qin W.,Chen W.,et al. Seasonal variability of VOCs in Nanjing, Yangtze River delta: Implications for emission sources and photochemistry[J]. Atmospheric Environment,2020-01-01,223