Author:Wepener, V; Van Vuren, JHJ; Chatiza, FP; Mbizi, Z; Slabbert, L; Masola, BDate:2005This paper presents results from a field study in the Rietvlei Wetland system, Gauteng, South Africa using the freshwater mollusk and freshwater fish as bioindicator organisms. Active biomonitoring (ABM) exposures were conducted where organisms ...Read more
Author:Engelbrecht, CJ; Landman, WA; Engelbrecht, FADate:Sep 2012Climate predictability and variability studies over South Africa typically focus on the summer rainfall region and to a lesser extent on the winter rainfall region. The all-year rainfall region of South Africa, a narrow strip located along ...Read more
Author:Brunke, EG; Labuschagne, C; Parker, B; Van der Spuy, D; Whittlestone, SDate:May 2002Specific factors of a baseline Rn-222 detector installed at Cape Point, South Africa, were studied with the aim of improving its performance. Direct sunlight caused air turbulence within the instrument, resulting in 13.6% variability of the ...Read more
Author:Simpson, LA; Botai, J; De Koning, E; Sivakumar, VDate:Sep 2011This study aims to find a correlation between lightning polarity and microphysical properties of a storm cloud, for events where large amounts of lightning damage have occured and/or there has been a reported lightning-related fatality.Read more
Author:Sivakumar, V; Sharma, Ameeth; Chiloane, K; Naidoo, S; Lynch, EDate:Sep 2011In this paper, the authors present a night-time continuous CSIR-NLC mobile observation of highaltitude cirrus cloud. The LIDAR measurements will also elucidate the aerosol concentration, optical depth, cloud position, thickness and other ...Read more
Author:Brent, AC; Rogers, DECDate:Jul 2002Air pollution control devices (APCDs) are not compulsory for medical waste incinerators (MWIs) in developing countries. In South Africa, combustion gases are usually vented directly to the atmosphere at temperatures greater than the formation ...Read more
Author:Makgabutlane, M; Wright, CYDate:Sep 2013Pretoria receives a fair amount of solar ultraviolet radiation (UVR). Certain meteorological factors affect the amount of solar UVR that reaches the ground. The most dominant influencing meteorological factors are stratospheric ozone, cloud ...Read more
Author:Sivakumar, V; Gizaw Mengistu, DT; Botai, OJDate:2009The aim of this work is to construct a model (mean) profile for ozone and water vapor in Southern hemisphere latitude using 14 years (1993-2006) of Halogen Occultation Experiment (HALOE) satellite data and about 10 years (1998-2007) of the ...Read more
Author:Zunckel, M; Robertson, L; Tyson, PD; Rodhe, HDate:2000Ambient SO2 concentrations and atmospheric deposition of sulphur resulting from emissions on the industrialised highveld region of South Africa are estimated using the multi-scale atmospheric transport and chemistry (MATCH) modelling system, ...Read more
Author:Landman, WA; DeWitt, D; Lotter, DDate:Sep 2010The predictability of South African summer rainfall is investigated using coupled ocean-atmosphere models.Read more
Author:Limbeck, A; Puxbaum, H; Otter, L; Scholes, MCDate:2001In this study aerosol samples from the South African savannah were analyzed for their polar organic constituents. Samples were collected with a front/back-up filter tandem system of quartz fibre filters (dual filter strategy). In all samples ...Read more
Author:Bopape, Mary-Jane MDate:Sep 2009Dynamic downscaling for climate studies utilises a regional climate model that is nested within a global climate model (GCM) or global reanalyses. The GCM or global reanalyses data is interpolated to the RCM's grid and used to drive the RCM ...Read more
Author:Wright, C; Albers, PDate:Sep 2011While some sun exposure induces a sense of well-being and synthesis of vitamin D excess sun exposure has been associated with skin cancer, immune suppression and ocular cataracts. In South Africa, approximately 30% of all histologically-diagnosed ...Read more
Author:Fauchereau, N; Pohl, B; Monteiro, Pedro MS; Reason, CDate:Sep 2009In this study the authors investigate in particular its links with the Madden Julian Oscillation and ENSO, the dominant modes of tropical atmospheric variability at the intraseasonal and interannual timescales, respectively. It is showed here ...Read more
Author:Ture, K; Tsidu, GM; Sivakumar, VDate:Sep 2011Stratosphere-troposphere exchange (STE) influences the chemical composition of both the stratosphere and the troposphere and represents an important aspect of global change [Butchart and Scaife, 2001]. It is also often associated with severe ...Read more
Author:Luhunga, P; Djolov, G; Sivakumar, VDate:Sep 2011The aim of the paper is to study the SBL characteristics over the Highveld region of South Africa using automatic observational network data, theoretical models and recently developed mobile LiDAR system at the Council for Scientific and ...Read more
Author:Brunke, EG; Labuschagne, C; Scheel, HEDate:2001During the continuous monitoring of atmospheric parameters at the station Cape Point (34 degrees S, 18 degrees E), a smoke plume originating from a controlled fire of 30 year old fynbos was observed on 6 May 1997. For this episode, which was ...Read more