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DOI	10.1016/j.atmosenv.2020.117477
	Six-year observations of aerosol optical properties at a southern African grassland savannah site
	Venter M.; Beukes J.P.; Gideon van Zyl P.; Vakkari V.; Virkkula A.; Josipovic M.; Kulmala M.; Laakso L.
发表日期	2020
ISSN	1352-2310
卷号	230
英文摘要	Atmospheric aerosols have a significant effect on earth's radiative budget, particularly on regional scales. This paper presents a ~6 year, in situ, ground level aerosol scattering and absorption dataset, measured at a background site strategically positioned to enable differentiation of the effect of anthropogenic, population density and open biomass burning activities on a regional scale. Relatively well-defined seasonal and diurnal patterns were observed for all the aerosol optical properties, i.e. scattering coefficient (σSP), absorption coefficient (σAP), single scattering albedo (ω0) and Ångström exponent of scattering (αSP). These patterns were explained by considering southern African specific sources and metrological conditions. Using a receptor modelling method (auto-generated source maps) it was found that air masses that had higher σSP, σAP and ω0, and lower αSP, if compared with the relatively clean background, passed over source regions with significant industrial or other anthropogenic activities, higher population density, re-circulation of polluted air masses and higher open biomass burning frequency. To quantify differences, four source regions were defined, i.e. Karoo, Kalahari, anti-cyclonic recirculation pattern and the industrial hub of South Africa. Air masses that had passed over the Karoo source region represented the cleanest regional background conditions, while air masses that had passed either over the industrial hub and/or the anti-cyclonic recirculation pattern represented the most significant anthropogenically impacted, as indicated by the aerosol optical properties. The ω0 medians of air masses that had passed over the Karoo (0.80–0.86) were 9, 12 and 7% lower than in air masses that had passed over source regions with the highest ω0 median, in the warmest/wettest, coldest, and driest, peak open biomass burning periods, respectively. © 2020 Elsevier Ltd
关键词	Absorption coefficient (σAP)Aerosol scattering coefficient (σSP)Single scattering albedo (ω0)Welgegund measurement station Ångström exponent of scattering (αSP)
语种	英语
scopus关键词	Atmospheric aerosols; Biomass; Budget control; Population distribution; Population statistics; Absorption co-efficient; Aerosol optical property; Anthropogenic activity; Background conditions; Population densities; Receptor modelling; Scattering co-efficient; Single scattering albedo; Optical properties; absorption; aerosol; biomass burning; climate conditions; grassland; human activity; meteorology; observational method; optical property; radiation budget; savanna; aerosol; air pollution; Article; atmospheric dispersion; biomass; circadian rhythm; combustion; grassland; industrial area; light absorption; light scattering; optics; population density; priority journal; savanna; seasonal variation; South Africa; Karoo; 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/249179
作者单位	Atmospheric Chemistry Research Group, Chemical Resource Beneficiation, North-West University, Potchefstroom, South Africa; Finnish Meteorological Institute, Helsinki, Finland; Department of Physics, University of Helsinki, PO Box 64FIN-00014, Finland
推荐引用方式 GB/T 7714	Venter M.,Beukes J.P.,Gideon van Zyl P.,et al. Six-year observations of aerosol optical properties at a southern African grassland savannah site[J],2020,230.
APA	Venter M..,Beukes J.P..,Gideon van Zyl P..,Vakkari V..,Virkkula A..,...&Laakso L..(2020).Six-year observations of aerosol optical properties at a southern African grassland savannah site.ATMOSPHERIC ENVIRONMENT,230.
MLA	Venter M.,et al."Six-year observations of aerosol optical properties at a southern African grassland savannah site".ATMOSPHERIC ENVIRONMENT 230(2020).