Browsing Faculty of Natural and Agricultural Sciences by Author "Piketh, S."
Now showing items 1-5 of 5
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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 ... -
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 ... -
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 ... -
One year of Raman lidar observations of free-tropospheric aerosol layers over South Africa
Giannakaki, E.; Laakso, L.; Beukes, J.P.; Van Zyl, P.G.; Josipovic, M.; Tiitta, P.; Piketh, S. (EGU, 2015)Raman lidar data obtained over a 1 year period has been analysed in relation to aerosol layers in the free troposphere over the Highveld in South Africa. In total, 375 layers were observed above the boundary layer during ... -
An overview of regional and local characteristics of aerosols in South Africa using satellite, ground, and modeling data
Hersey, S.P.; Piketh, S.; Burger, R.; Garland, R.M.; Crosbie, E. (European Geosciences Union, 2015)We present a comprehensive overview of particulate air quality across the five major metropolitan areas of South Africa (Cape Town, Bloemfontein, Johannesburg and Tshwane (Gauteng Province), the Industrial Highveld Air ...