Browsing Faculty of Natural and Agricultural Sciences by Author "6cb8ba7c-e35f-4279-89e5-17ca96f7664b"
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Carbon balance of a grazed savanna grassland ecosystem in South Africa
Räsänen, Matti; Beukes, Johan P.; Van Zyl, Pieter G.; Josipovic, Miroslav; Venter, Andrew D.; Jaars, Kerneels; Siebert, Stefan J.; Laakso, Lauri (EGU, 2017)Tropical savannas and grasslands are estimated to contribute significantly to the total primary production of all terrestrial vegetation. Large parts of African savannas and grasslands are used for agriculture and cattle ... -
Measurements of biogenic volatile organic compounds at a grazed savannah grassland agricultural landscape in South Africa
Jaars, Kerneels; Van Zyl, Pieter G.; Beukes, Johan P.; Josipovic, Micky; Venter, Andrew D.; Knoetze, Leandra; Cilliers, Dirk P.; Siebert, Stefan J.; Laakso, Lauri (EGU, 2016)Biogenic volatile organic compounds (BVOCs) play an important role in the chemistry of the troposphere, especially in the formation of tropospheric ozone (O3) and secondary organic aerosols (SOA). Ecosystems produce and ... -
Receptor modelling and risk assessment of volatile organic compounds measured at a regional background site in South Africa
Jaars, Kerneels; Van Zyl, Pieter G.; Beukes, Johan P.; Venter, Marcell; Josipovic, Miroslav (Elsevier, 2018)Volatile organic compounds (VOCs) can have significant impacts on climate and human health. Certain VOCs are proven to be carcinogenic and toxic, which can affect human health directly and indirectly. In order to develop ... -
Receptor modelling and risk assessment of volatile organic compounds measured at a regional background site in South Africa North-West University’s research published in Atmospheric Environment. (Research brief)
Jaars, Kerneels; Van Zyl, Pieter G.; Beukes, Johan P.; Venter, Marcell; Josipovic, Miroslav (NACA, 2018) -
Regional atmospheric Cr(VI) pollution from the Bushveld Complex, South Africa
Venter, Andrew Derick; Beukes, Johan Paul; Van Zyl, Pieter Gideon; Josipovic, Miroslav; Jaars, Kerneels; Vakkari, Ville (Elsevier, 2016)Hexavalent chromium, Cr(VI), is a proven human carcinogen. Of interest in this paper was the regional atmospheric pollution of Cr(VI) from the ferrochromium and related industries located in the western Bushveld Complex ... -
Seasonal influences on surface ozone variability in continental South Africa and implications for air quality
Laban, Tracey Leah; Van Zyl, Pieter Gideon; Beukes, Johan Paul; Jaars, Kerneels; Josipovic, Miroslav (EGU, 2018)Although elevated surface ozone (O3) concentrations are observed in many areas within southern Africa, few studies have investigated the regional atmospheric chemistry and dominant atmospheric processes driving surface O3 ... -
Spatial, temporal and source contribution assessments of black carbon over the northern interior of South Africa
Chiloane, Kgaugelo Euphinia; Beukes, Johan Paul; Van Zyl, Pieter Gideon; Maritz, Petra; Josipovic, Miroslav; Venter, Andrew Derick; Jaars, Kerneels; Tiitta, Petri; Laakso, Lauri (EGU, 2017)After carbon dioxide (CO2), aerosol black carbon (BC) is considered to be the second most important contributor to global warming. This paper presents equivalent black carbon (eBC) (derived from an optical absorption method) ... -
Terpenoid and carbonyl emissions from Norway spruce in Finland during the growing season
Hakola, Hannele; Jaars, Kerneels; Tarvainen, Virpi; Praplan, Arnaud P.; Hemmilä, Marja (EGU, 2017)We present spring and summer volatile organic compound (VOC) emission rate measurements from Norway spruce (Picea abies L. Karst) growing in a boreal forest in southern Finland. The measurements were conducted using in ...