DOI: 10.1016/j.atmosenv.2015.04.044
Scopus记录号: 2-s2.0-84928639474
论文题名: Evaluation of the ability of the EC tracer method to estimate secondary organic carbon
作者: Day M ; C ; , Zhang M ; , Pandis S ; N
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2015
卷: 112 起始页码: 317
结束页码: 325
语种: 英语
英文关键词: Chemical transport model
; EC tracer method
; PMCAMx
; Primary organic aerosol
; Secondary organic aerosol
Scopus关键词: Aerosols
; Atmospheric movements
; Carbon
; Chemical industry
; Organic compounds
; Radioactive tracers
; Reaction intermediates
; Volatile organic compounds
; Chemical transport models
; Ec tracer methods
; Organic aerosol
; PMCAMx
; Secondary organic aerosols
; Organic carbon
; organic carbon
; secondary organic carbon
; tracer
; unclassified drug
; volatile organic compound
; accuracy assessment
; climate modeling
; concentration (composition)
; estimation method
; organic carbon
; simulation
; urban area
; accuracy
; Article
; atmosphere
; circadian rhythm
; concentration (parameters)
; evaporation
; industrial area
; internal consistency
; measurement
; oxidation
; priority journal
; secondary organic aerosol
; simulation
; synthesis
; United States
; urban area
; United States
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: The elemental carbon (EC) tracer method has often been used to estimate the primary and secondary organic aerosol (OA) fractions using field measurements of organic carbon (OC) and EC. In this observation-based approach, EC is used as a tracer for primary OC (POC), which allows for the estimation of secondary OC (SOC). The accuracy of this approach is evaluated using concentrations generated by PMCAMx, a three-dimensional chemical transport model that simulates the complex processes leading to SOC formation (including evaporation and chemical processing of POC and chemical aging of semivolatile and intermediate volatility organics). The ratio of primary organic to elemental carbon [OC/EC]p is estimated in various locations in the Eastern United States, and is then used to calculate the primary and secondary OC concentrations. To estimate the [OC/EC]p from simulated concentrations, we use both a traditional approach and the high EC edge method, in which only values with the highest EC/OC ratio are used. Both methods perform best on a daily-averaged basis, because of the variability of the [OC/EC]p ratio during the day. The SOC estimated by the EC tracer methods corresponds to the biogenic and anthropogenic SOC formed during the oxidation of volatile organic compounds. On the other hand, the estimated POC corresponds to the sum of the fresh POC, the SOC from oxidation of the evaporated POC and the intermediate volatility organic compounds, and the OC from long-distance transport. With this correspondence, the traditional EC tracer method tends to overpredict primary OC and underpredict secondary OC for the selected urban areas in the eastern United States. The high EC edge method performs better, especially in areas where the primary contribution to OC is smaller. Despite the weaknesses of models like the one used here, the conclusions about the accuracy of observation-based methods like the EC-tracer approach should be relatively robust due to the internal consistency of the data and the approach. © 2015 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/81706
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Chemical Engineering, Carnegie Mellon University, Pittsburgh, PA, United States; Department of Chemical Engineering, University of Patras, Patras, Greece; Institute of Chemical Engineering Sciences, Foundation for Research and Technology Hellas (FORTH), Patras, Greece
Recommended Citation:
Day M,C,, Zhang M,et al. Evaluation of the ability of the EC tracer method to estimate secondary organic carbon[J]. Atmospheric Environment,2015-01-01,112