DOI: 10.1016/j.atmosenv.2014.09.013
Scopus记录号: 2-s2.0-84934912133
论文题名: Ozone enhancement in western US wildfire plumes at the Mt. Bachelor Observatory: The role of NOx
作者: Baylon P ; , Jaffe D ; A ; , Wigder N ; L ; , Gao H ; , Hee J
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2015
卷: 109 起始页码: 297
结束页码: 304
语种: 英语
英文关键词: Enhancement ratio
; Ozone production
; Western U.S
; Wildfire
Scopus关键词: Fires
; Mixing
; Observatories
; Skin
; Thermal plumes
; Enhancement ratios
; Mixing ratios
; Negative correlation
; Ozone mixing ratio
; Ozone production
; Reactive nitrogen
; Western U.S
; Wildfire
; Ozone
; fossil fuel
; isoprene
; nitrogen
; ozone
; atmospheric deposition
; atmospheric plume
; carbon monoxide
; correlation
; mixing ratio
; nitrogen
; nitrous oxide
; observatory
; ozone
; photochemistry
; regression analysis
; wildfire
; aerosol
; air quality
; ambient air
; Article
; atmosphere
; biomass
; chemoluminescence
; dry deposition
; fire
; high temperature
; limit of detection
; oxidation
; particle size
; photochemistry
; photolysis
; plume
; priority journal
; secondary organic aerosol
; simulation
; summer
; troposphere
; United States
; urban population
; water vapor
; Cascade Range
; Mount Bachelor
; Oregon
; 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: We looked at 19 wildfire events that were observed in the summers of 2012 and 2013 at the Mt. Bachelor Observatory (MBO, 2.7 km a.s.l.), a mountaintop site located in central Oregon. We identified wildfire plumes using enhancement ratios (ΔY/ΔX), which we calculated for each plume by taking the Reduced Major Axis linear regression slope of various species. We reported the calculated enhancement ratios and explored their relationship with ozone production. We observed a negative correlation between ΔO3/ΔCO and ΔNOx/ΔNOy (r = -0.72). This showed that the degree of NOx oxidation is a key predictor of ozone production. The highest ΔNOx/ΔNOy (0.57 pptv/pptv) was associated with ozone loss (ozone titration). Low ΔNOx/ΔNOy values (ranging from 0.049 to 0.15 pptv/pptv) are generally associated with ozone enhancement. We also found that even if ΔO3/ΔCO is low, ΔO3 may still be significant if CO enhancements are large. We then explored events that are not associated with any O3 enhancement/loss. Out of 19 fire events, 3 belong to this category. We discovered that these events are either BL-influenced (O3 deposition), associated with low ΔNOy/ΔCO ratios, and/or associated with minimal photochemistry (due to nighttime transport). Absolute ozone enhancements ranged from 3.8 to 32 ppbv, while ozone production efficiencies (OPEs) ranged from 2.1 to 17. However, because PAN comprises most of the reactive nitrogen in fire plumes, the calculated OPEs underestimated the true ozone mixing ratios. OPEs may therefore be misleading indicators of ozone production in wildfires. Finally, we segregated the data into plume/non-plume time periods. From this we found that the average O3 mixing ratio was significantly higher in fire plumes compared to non-plume time periods, and the noontime NO/NO2 ratios were also higher. This later result gives insight into the photochemical environment in the fire plumes. © 2014 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/81834
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Atmospheric Sciences, University of Washington, 408 Atmospheric Sciences-Geophysics Building, Seattle, WA, United States; School of Science and Technology, University of Washington-Bothell, 18115 Campus Way NE, Bothell, WA, United States
Recommended Citation:
Baylon P,, Jaffe D,A,et al. Ozone enhancement in western US wildfire plumes at the Mt. Bachelor Observatory: The role of NOx[J]. Atmospheric Environment,2015-01-01,109