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DOI	10.1016/j.atmosenv.2019.117256
	Observations of ozone formation in southern African savanna and grassland fire plumes
	Vakkari V.; Beukes J.P.; Josipovic M.; van Zyl P.G.
发表日期	2020
ISSN	13522310
卷号	223
英文摘要	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
英文关键词	Emission factors; Grassland; Open biomass burning; Ozone; Savanna
学科领域	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
语种	英语
scopus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
来源期刊	Atmospheric Environment
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/120777
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
推荐引用方式 GB/T 7714	Vakkari V.,Beukes J.P.,Josipovic M.,et al. Observations of ozone formation in southern African savanna and grassland fire plumes[J],2020,223.
APA	Vakkari V.,Beukes J.P.,Josipovic M.,&van Zyl P.G..(2020).Observations of ozone formation in southern African savanna and grassland fire plumes.Atmospheric Environment,223.
MLA	Vakkari V.,et al."Observations of ozone formation in southern African savanna and grassland fire plumes".Atmospheric Environment 223(2020).