DOI: 10.1016/j.atmosenv.2019.117212
论文题名: Sensitivity analysis of area-wide, mobile source emission factors to high-emitter vehicles in Los Angeles
作者: Kelp M. ; Gould T. ; Austin E. ; Marshall J.D. ; Yost M. ; Simpson C. ; Larson T.
刊名: Atmospheric Environment
ISSN: 1352-2310
出版年: 2020
卷: 223 语种: 英语
英文关键词: Air pollution
; Carbon dioxide
; Factor analysis
; Fleet operations
; Nitrogen oxides
; Principal component analysis
; Remote sensing
; Vehicles
; Confidence limit
; Heavy duty vehicles
; High emitting vehicles
; Light duty vehicles
; Mobile source emissions
; Principal Components
; Traffic-related air pollution
; Vehicle exhaust emissions
; Sensitivity analysis
学科: High-emitting vehicles
; Principal component analysis
; Sensitivity analysis
; Traffic related air pollution
; Vehicle exhaust emission factors
中文摘要: The absolute principal component scores (APCS) model was applied to on-road, background-adjusted measurements of NOx, CO, CO2, black carbon (BC), and particle number (PN) obtained from a continuously moving platform deployed during 16 afternoon sampling periods in Los Angeles, CA. High-emitter biasing observations were separated from the vehicle fleet population based on a sensitivity analysis of different a priori screening values of the ratio of CO to CO2. A BC/PN-rich feature consistent with heavy-duty vehicle exhaust, and a separate CO/CO2-rich feature consistent with light-duty vehicle exhaust, described 66% of the variance of the observations. We used bootstrapped APCS model predictions to estimate area-wide, average fuel-based emission factors and their respective 95% confidence limits. If no screening was used, we obtained incongruous average emission factors relative to recent field studies for NOx, CO, BC and PN (5.1, 2.0, 0.13 g/kg, and 1.0 × 10^15 particles/kg for heavy-duty vehicles, and 2.0, 111, 0.023 g/kg, and 0.09 × 10^15 particles/kg for light-duty vehicles, respectively). However, if reasonable a priori screening values were applied, which differentiate measurements reflecting high-emitter outliers, average emission factors for NOx, CO, BC and PN (12.8, 4.0, 0.37 g/kg, and 2.6 × 10^15 particles/kg for heavy-duty vehicles, and 1.5, 40.9, 0.004 g/kg, and 0.08 × 10^15 particles/kg for light-duty vehicles, respectively) were consistent with previous estimates based on remote sensing, vehicle chase studies, and recent dynamometer tests. © 2019 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/160581
Appears in Collections: 气候变化与战略
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作者单位: Harvard University, Department of Earth and Planetary Sciences, Cambridge, MA 02138, United States; University of Washington, Department of Civil and Environmental Engineering, Box 352700, Seattle, WA 98195-2700, United States; University of Washington, Department of Environmental and Occupational Health Sciences, Box 357234, Seattle, WA 98195-7234, United States
Recommended Citation:
Kelp M.,Gould T.,Austin E.,et al. Sensitivity analysis of area-wide, mobile source emission factors to high-emitter vehicles in Los Angeles[J]. Atmospheric Environment,2020-01-01,223