A5031097225- Climate variability and models
- Meteorological Phenomena and Simulations
- Tropical and Extratropical Cyclones Research
- Hydrology and Drought Analysis
- Oceanographic and Atmospheric Processes
- Crop Yield and Soil Fertility
- Science and Climate Studies
- Climate change impacts on agriculture
- Agricultural risk and resilience
- Atmospheric and Environmental Gas Dynamics
- Flood Risk Assessment and Management
- Air Quality Monitoring and Forecasting
- Life Cycle Costing Analysis
- Pleistocene-Era Hominins and Archaeology
- Plant responses to elevated CO2
- Ruminant Nutrition and Digestive Physiology
- Hydrology and Watershed Management Studies
- Bioenergy crop production and management
- Soil erosion and sediment transport
- Forest ecology and management
- Forest Biomass Utilization and Management
- Noise Effects and Management
- Environmental and Air Quality Management
- Plant Water Relations and Carbon Dynamics
- Air Quality and Health Impacts
University of Pretoria
2008-2024
South African Weather Service
2020-2024
Institute for Soil, Climate and Water
2008-2021
Consiglio per la ricerca in agricoltura e l’analisi dell’economia agraria
2015-2019
Tshwane University of Technology
2012
Abstract The projected climate‐change signal in simulations by the Conformal‐Cubic Atmospheric Model (CCAM) over southern Africa is presented, with particular emphasis on changes circulation region. Current (1975–2005) and future (2070–2100; A2 scenario) climate are used for this purpose. In austral winter of climate, frontal rain bands displaced to south as a result subtropical high‐pressure belt intensifying subcontinent. spring autumn, mid‐ upper‐level highs simulated become more...
Abstract Mid‐tropospheric closed‐lows (cold‐core cut‐off lows and warm‐core tropical lows) are important rain producing weather systems for the southern Africa region. Over South Africa, most wide‐spread flood events caused by these systems. It is therefore to explore potential impact of anthropogenic forcing on occurrence extreme rainfall over Coupled global circulation models (CGCMs) can not be directly applied this purpose because their relatively low spatial resolution—some form...
Abstract The study provides perspective on the contribution of landfalling tropical systems (cyclones, depressions, storms and lows) from southwest Indian Ocean (SWIO) towards rainfall over eastern interior southern Africa, period 1948–2008. Although these contribute to < 10% annual occurring region, their relative local widespread heavy events is shown be highly significant. About 50% northeastern South Africa are caused by systems. Fourier analysis performed time series in association...
The Eastern Cape Province, and in particular, it's interior western Karoo region, has long been subject to periodic droughts, with significant implications for agricultural sector. From 2015, some recovery 2020, the area experienced a severe multi year drought, negative impacts range of sectors, including extensive livestock farming. At time common narrative media stated that drought was unprecedented. In this paper, we analyze how evolved climatically, as well its on vegetation farming...
Snowfall occurs every winter over the mountains of South Africa but is rare highly populated metropolises interior Africa. When snowfall does occur areas, it causes widespread disruption to infrastructure and even loss life. Because rarity snow Africa, inexperienced weather forecasters often miss these events. We propose a five-step forecasting decision tree in which all five criteria must be met forecast snowfall. The comprises physical attributes that are necessary for occur. first step...
Abstract Subseasonal‐to‐seasonal (S2S) prediction has gained momentum in the recent past as a need for predictions between weather forecasting timescale and seasonal exists. The availability of S2S databases makes predictability studies possible over all regions globe. Most are, however, relevant to northern hemisphere. In this review, literature southern hemisphere (SH) are presented. Predictive skill, sources predictability, application discussed. Indications from subseasonal SH suggest...
Abstract Forecast skill of three subseasonal‐to‐seasonal models and their ensemble mean outputs are evaluated in predicting the surface minimum maximum temperatures at subseasonal timescales over South Africa. Three scores (correlation anomaly, root‐mean‐square error, Taylor diagrams) used to evaluate models. It is established that considered here have both timescales. The correlation anomaly indicates multimodel outperforms individual for day 1–14, 11–30, full calendar month during December...
ABSTRACT The skill in predicting intraseasonal characteristics of synoptic type occurrences at the seasonal time scale over all‐year rainfall region South Africa (35°–33°S and 21°–27°E) is assessed by utilizing an ensemble simulations performed using GloSea5 coupled ocean–atmosphere model. Hindcasts daily sea‐level pressure fields 14 austral spring [September–October–November ( SON )] summer [December–January–February DJF seasons, initialized August November, respectively, are analysed....
The effects of climate change on water resources could be numerous and widespread, affecting quality security across the globe. Variations in rainfall erosivity temporal patterns, along with changes biomass land use, are some impacts is projected to have soil erosion. Sedimentation watercourses reservoirs, especially water-stressed regions such as sub-Saharan Africa, may hamper resilience. Modelling sediment yield under various scenarios vital develop mitigation strategies which offset...
Abstract The probabilistic forecast skill level of statistically downscaled European Centre for Medium‐Range Weather Forecasts (ECMWF) subseasonal‐to‐seasonal (S2S) forecasts is determined in predicting maximum and minimum temperatures weeks 1–4 lead times during 20‐year December–January–February (DJF) seasons from 2001 to 2020 over South Africa. Skilful S2S are vital assisting decision‐makers the development contingency planning any eventualities that may arise because weather climate...
Air quality problems have been an inescapable partner of global economic development, and such prevailed since the industrial age. After democratisation South Africa in 1994, the government embarked on a law reforming process to bring all laws country line with new constitution South Africa. This included air legislation. Air management has undergone drastic changes implementation National Environmental: Quality Act (Act 39 2004). In previous dispensation,...