DOI: 10.1016/j.atmosenv.2019.117256
论文题名: Observations of ozone formation in southern African savanna and grassland fire plumes
作者: Vakkari V. ; Beukes J.P. ; Josipovic M. ; van Zyl P.G.
刊名: Atmospheric Environment
ISSN: 1352-2310
出版年: 2020
卷: 223 语种: 英语
英文关键词: Aerosols
; Air quality
; Biomass
; Budget control
; Carbon monoxide
; Earth atmosphere
; Fires
; Gases
; Nitric oxide
; Nitrogen oxides
; Sulfur dioxide
; Thermal plumes
; Volatile organic compounds
; Biomass burning emissions
; Biomass-burning
; Combustion characteristics
; Emission factors
; Grassland
; Particulate Matter
; Savanna
; Secondary aerosols
; Ozone
; nitrogen
; nitrogen oxide
; ozone
; aerosol formation
; air quality
; biomass burning
; carbon monoxide
; combustion
; grassland
; nitric oxide
; nitrogen oxides
; observational method
; ozone
; particulate matter
; radiative forcing
; savanna
; sulfur dioxide
; trace gas
; Article
; combustion
; grassland fire plume
; plume
; priority journal
; radiation exposure
; savanna
; South Africa
; South Africa
学科: Emission factors
; Grassland
; Open biomass burning
; Ozone
; Savanna
中文摘要: Open biomass burning is one of the largest sources of aerosols and reactive trace gases into the atmosphere, having a significant effect on earth's radiative budget and air quality. Biomass burning degrades air quality by increasing both particulate matter and ozone levels. Unlike aerosols, ozone is not directly emitted in fires but it is frequently formed in ageing plumes. This is not surprising, as many of the reactive trace gases emitted in biomass burning including nitrogen oxides, carbon monoxide and volatile organic compounds, act as precursors for ozone formation. Geographically, Africa is the most significant source region of biomass burning emissions. Here, we report rapid ozone formation in daytime savanna and grassland fire plumes observed in South Africa. We observed higher ozone production in more flaming cases for plumes fresher than 1.5h. However, in plumes aged >1.5h combustion characteristics have no effect, but ozone production is positively correlated with nitrogen oxides. Furthermore, the plumes with highest ozone production also had the strongest secondary aerosol formation during plume ageing. Additionally, we report emission factors of nitric oxide and sulphur dioxide for southern African savanna and grassland fires. SO2 emission factor was on average 1.1 g kg−1, which is two to three times higher than previous observations for savanna and grassland. On the other hand, the average NO emission factor (2.6 g kg−1) agrees well with previous observations. © 2020 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/160533
Appears in Collections: 气候变化与战略
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作者单位: Finnish Meteorological Institute, Helsinki, FI-00101, Finland; Unit for Environmental Sciences and Management, North-West University, Potchefstroom, ZA-2520, South Africa
Recommended Citation:
Vakkari V.,Beukes J.P.,Josipovic M.,et al. Observations of ozone formation in southern African savanna and grassland fire plumes[J]. Atmospheric Environment,2020-01-01,223