Browsing Faculty of Natural and Agricultural Sciences by Author "22648143 - Josipovic, Miroslav"
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Aerosol characterisation including oxidative potential as a proxy of health impact: a case of a residential site in a highly industrialised area
Josipovic, Miroslav; Segakweng, C. Keitumetse; Beukes, J. Paul; Van Zyl, Pieter G.; Leal-Liousse, Catherine (NACA, 2019)This study aimed to characterise aerosols sampled in the vicinity of a major industrialised area, i.e. the Vaal Triangle. It included the determination of oxidative potential as a predictive indicator of particle toxicity. ... -
An air quality assessment in the industrialised western Bushveld Igneous Complex, South Africa
Venter, Andrew D.; Beukes, Johan P.; Van Zyl, Pieter G.; Josipovic, Miroslav; Pienaar, Jacobus J.; Tiitta, Petri; Laakso, Lauri (ASSAf, 2012)South Africa has the largest industrialised economy in Africa, with significant mining and metallurgical activities. A large fraction of the South African mineral assets is concentrated in the Bushveld Igneous Complex ... -
Ambient aromatic hydrocarbon measurements at Welgegund, South Africa
Jaars, K.; Beukes, J.P.; Van Zyl, P.G.; Venter, A.D.; Josipovic, M.; Pienaar, J.J.; Tiitta, P.; Laakso, L. (EGU, 2014)Aromatic hydrocarbons are associated with direct adverse human health effects and can have negative impacts on ecosystems due to their toxicity, as well as indirect negative effects through the formation of tropospheric ... -
The anthropogenic contribution to atmospheric black carbon concentrations in southern Africa: a WRF-Chem modeling study
Kuik, F.; Beukes, J.P.; Van Zyl, P.G.; Josipovic, M.; Laakso, L.; Lauer, A.; Vakkari, V. (EGU, 2015)South Africa has one of the largest industrialized economies in Africa. Emissions of air pollutants are particularly high in the Johannesburg-Pretoria metropolitan area, the Mpumalanga Highveld and the Vaal Triangle, ... -
Assessment of polar organic aerosols at a regional background site in southern Africa
Booyens, Wanda; Beukes, Johan P.; Van Zyl, Pieter G.; Josipovic, Miroslav; Laakso, Lauri (Springer, 2019)A recent paper reported GCxGC-TOFMS analysis used for the first time in southern Africa to tentatively characterise and semi-quantify ~1000 organic compounds in aerosols at Welgegund – a regional background atmospheric ... -
Atmospheric boundary layer top height in South Africa: measurements with lidar and radiosonde compared to three atmospheric models
Korhonen, K.; Laakso, L.; Beukes, J.P.; Van Zyl, P.G.; Josipovic, M.; Tiitta, P. (EGU, 2014)Atmospheric lidar measurements were carried out at Elandsfontein measurement station, on the eastern Highveld approximately 150 km east of Johannesburg in South Africa throughout 2010. The height of the planetary ... -
Atmospheric dry and wet deposition of sulphur and nitrogen species and assessment of critical loads of acidic deposition exceedance in South Africa
Josipovic, Miroslav; Pienaar, Jacobus Johannes; Piketh, Stuart; Keen, Melanie; Annegarn, Harold (ASSAf, 2011)We tested the hypothesis that acidic atmospheric pollution deposition, originating from the South African central industrial area, poses an environmental threat across a larger region within the dispersal footprint. A ... -
Atmospheric trace metals measured at a regional background site (Welgegund) in South Africa
Venter, Andrew D.; Van Zyl, Pieter G.; Beukes, Johan P.; Josipovic, Micky; Hendriks, Johan; Laakso, Lauri (EGU, 2017)Atmospheric trace metals can cause a variety of health-related and environmental problems. Only a few studies on atmospheric trace metal concentrations have been conducted in South Africa. Therefore the aim of this study ... -
Automated continuous air monitoring
Beukes, Johan Paul; Venter, Andrew Derick; Josipovic, Miroslav; Van Zyl, Pieter Gideon; Jaars, Kerneels; Dunn, Marcell; Laakso, Lauri (Elsevier, 2015)Anthropogenic and anthropogenically induced emissions (such as emissions due to land use change) of various gaseous and particulate atmospheric species have substantially increased since the onset of the industrial ... -
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 ... -
Characterising particulate organic nitrogen at a savannah-grassland region in South Africa
Booyens, Wanda; Van Zyl, Pieter G.; Beukes, Johan P.; Vakkari, Ville; Josipovic, Miroslav; Laakso, Lauri (MDPI, 2019)Although atmospheric organic N compounds are considered to be important, especially in new particle formation and their contribution to brown carbon, these species are not that well understood. This can be partially ... -
Characterization of satellite-based proxies for estimating nucleation mode particles over South Africa
Sundström, A.-M.; Laakso, L.; Beukes, J.P.; Van Zyl, P.G.; Josipovic, M.; Venter, A.D.; Jaars, K.; Pienaar, J.J.; Piketh, S.; Chiloane, E.K. (EGU, 2015)Proxies for estimating nucleation mode number concentrations and further simplification for their use with satellite data have been presented in Kulmala et al. (2011). In this paper we discuss the underlying assumptions ... -
Chemical composition, main sources and temporal variability of PM1 aerosols in southern African grassland
Tiitta, P.; Beukes, J.P.; Van Zyl, P.G.; Josipovic, M.; Venter, A.D.; Jaars, K.; Pienaar, J.J.; Laakso, L. (EGU, 2014)Southern Africa is a significant source region of atmospheric pollution, yet long-term data on pollutant concentrations and properties from this region are rather limited. A recently established atmospheric measurement ... -
A comparison of surface NO2 mixing ratios and total column observations at a South African site
Josipovic, Micky; Burger, Roelof P.; Thompson, Anne M.; Beukes, Johan P.; Van Zyl, Pieter G.; Venter, Andrew D.; Jaars, Kerneels; Laakso, Lauri (SASAS, 2014)The total column density nitrogen dioxide (NO2) retrievals collated by a ground-based sun-tracking spectrometer (Pandora/GSFC) and the satellite-borne (Aura) Ozone Monitoring Instrument (OMI) were compared to the volume ... -
Correction for a measurement artifact of the Multi-Angle Absorption Photometer (MAAP) at high black carbon mass concentration levels
Hyvärinen, A.-P.; Laakso, L.; Beukes, J.P.; Van Zyl, P.G.; Josipovic, M.; Garland, R.M. (EGU, 2013)The Multi-Angle Absorption Photometer (MAAP) is a widely-used instrument for aerosol black carbon (BC) measurements. In this paper, we show correction methods for an artifact found to affect the instrument accuracy in ... -
Differences in aerosol absorption Ångström exponents between correction algorithms for a particle soot absorption photometer measured on the South African Highveld
Backman, J.; Beukes, J.P.; Van Zyl, P.G.; Josipovic, M.; Piketh, S.; Tiitta, P.; Chiloane, K.; Laakso, L. (European Geosciences Union, 2014)Absorption Ångström exponents (AAEs) calculated from filter-based absorption measurements are often used to give information on the origin of the ambient aerosol, for example, to distinguish between urban pollution ... -
The effect of rainfall amount and timing on annual transpiration in grazed savanna grassland
Räsänen, Matti; Beukes, Johan P.; Van Zyl, Pieter G.; Josipovic, Miroslav; Siebert, Stefan J.; Laakso, Lauri (EGU, 2020)The role of precipitation (P) variability on evapotranspiration (ET) and its two components transpiration (T) and evaporation (E) rates from savannas continues to draw significant research interest given its relevance to ... -
Estimating the concentration of nucleation mode aerosol particles over South Africa using satellite remote sensing measurements
Sundström, A.-M.; Laakso, L.; Beukes, J.P.; Van Zyl, P.G.; Josipovic, M.; Venter, A.D.; Jaars, K.; Pienaar, J.J.; Piketh, S.; Chiloane, E.K. (AIP Publishing, 2013)In this work satellite based observations were used to estimate the concentration of nucleation mode aerosols over South Africa. The nucleation mode aerosols can not be detected directly with satellite instruments since ... -
Free tropospheric aerosols over South Africa
Elina, Giannakaki; Laakso, Lauri; Beukes, Johan P.; Van Zyl, Pieter G.; Josipovic, Miroslav; Tiitta, Petri; Chiloane, Kgaugelo; Piketh, Stuart (EDP Sciences, 2016)Raman lidar data of one year was been analyzed to obtain information relating aerosol layers in the free troposphere over South Africa, Elandsfontein. In total, 375 layers were observed above the boundary layer during the ... -
General overview: European integrated project on Aerosol Cloud Climate and Air Quality Interactions (EUCAARI): integrating aerosol research from nano to global scales
Kulmala, M.; Beukes, J.P.; Josipovic, M.; Laakso, L.; Pienaar, J.J.; Van Zyl, P.G. (EGU, 2011)In this paper we describe and summarize the main achievements of the European Aerosol Cloud Climate and Air Quality Interactions project (EUCAARI). EUCAARI started on 1 January 2007 and ended on 31 December 2010 leaving a ...