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Browsing by Author "Landman, WA"

Now showing items 36-55 of 73

Predictability of the intra-seasonal rainfall characteristics variables over South Africa

Author: Phakula, S ; Landman, WA ; Beraki, Asmerom F Date: Sep 2015 Aspects of seasonal forecast skill of the SCM and ECHAM4.5 general circulation model (GCMs) are assessed over South Africa. The GCMs output is configured to predict low and high number of rainfall days at South African Weather Service stations ... Read more
Predicting the extreme 2015/16 El Nino event

Author: Mpheshea, LE ; Landman, WA Date: Sep 2015 A strong El Niño phenomenon is expected to develop during the austral summer. This study seeks to address the two main questions. 1) How strong will the 2016 event be? 2) With how much skill and confidence can a really strong event be predicted? ... Read more
Prediction of inflows into Lake Kariba using a combination of physical and empirical models

Author: Muchuru, S ; Landman, WA ; DeWitt, DG Date: Oct 2015 Seasonal climate forecasts are operationally produced at various climate prediction centres around the world. However, these forecasts may not necessarily be appropriately integrated into application models in order to help with decision-making ... Read more
Projected changes in tropical cyclone climatology and landfall in the Southwest Indian Ocean region under enhanced anthropogenic forcing

Author: Malherbe, Johan ; Engelbrecht, FA ; Landman, WA Date: Dec 2012 The conformal-cubic atmospheric model, a variable-resolution global model, is applied at high spatial resolution to perform simulations of present-day and future climate over southern Africa and over the Southwest Indian Ocean. The model is ... Read more
Ranking seasonal rainfall forecast skill of emerging and developing economies

Author: Landman, WA ; Barnston, AG ; Vogel, C Date: Sep 2015 Some of the biggest emerging markets economies include countries in South America, Asia and Africa. In the global south, political and developmental similarities (e.g. climate variability occurring in conjunction with marked developmental ... Read more
Recent advances in operational seasonal forecasting in South Africa: Models, infrastructure and networks

Author: Landman, WA ; Beraki, Asmerom F Date: Nov 2011 The various institutions involved with seasonal forecast development and production are discussed. New modelling approaches and the establishment of infrastructures to improve forecast dissemination are discussed. Read more
Regional Projections of Extreme Apparent Temperature Days in Africa and the Related Potential Risk to Human Health

Author: Garland, Rebecca M ; Matooane, M ; Engelbrecht, FM ; Bopape, Mary-Jane M ; Landman, WA ; Naidoo, M ; Van der Merwe, J ; Wright, CY Date: Oct 2015 Regional climate modelling was used to produce high resolution climate projections for Africa, under a “business as usual scenario”, that were translated into potential health impacts utilizing a heat index that relates apparent temperature ... Read more
The relative contribution of synoptic types to rainfall over the Cape south coast region

Author: Engelbrecht, CJ ; Landman, WA ; Engelbrecht, FA Date: Sep 2013 A synoptic decomposition of rainfall over the Cape south coast region for the period 1979-2011 is presented. This decomposition is achieved by considering the average daily low-level circulation to develop a synoptic climatology, using a Self ... Read more
Reservoir Management using seasonal forecasts in Lake Kariba and Lake Kahora Bassa: Initial results and plans

Author: Muchuru, S ; Landman, WA Date: Jun 2012 Seasonal forecasting as a tool to improve on reservoir management in Zimbabwe is presented. The focus of the talk is on predicting rainfall extremes over the Lake Kariba catchments. The forecast systems to do the predictions and the levels ... Read more
Response of the Southern Annular Mode to tidal forcing and the bidecadal rainfall cycle over subtropical southern Africa

Author: Malherbe, Johan ; Engelbrecht, FA ; Landman, WA Date: Mar 2014 Synoptic weather data and rainfall records are used to support previous suggestions that the decadal-scale cycle in certain climate records may be attributed to the modulation in tidal forcing related to the 18.6 year lunar nodal cycle. The ... Read more
River-flow predictions for the South African mid-summer using a coupled general circulation model

Author: Olivier, C ; Landman, WA ; Beraki, Asmerom F Date: Sep 2013 There are limited sources of streamflow data available in South Africa. These include simulated streamflow for catchments across South Africa and measured river-flow at specific rivers around the country. Given that a number of studies has ... Read more
The role of the southern annular mode in dynamical global coupled model

Author: Beraki, Asmerom F ; Landman, WA Date: Sep 2013 The interannual and decadal variability of the Southern Annual Mode (SAM) was examined in the ECHAM 4.5-MOM3-SA ocean-atmosphere coupled general circulation model (OAGCM). The analysis placed emphasis on the behavior of the SAM when its ... Read more
Seasonal forecasting of synoptic type variability: potential intraseasonal predictability relevant to the Cape south coast of South Africa

Author: Engelbrecht, CJ ; Landman, WA Date: Sep 2015 An ensemble of 12 sea-level pressure (SLP) simulations from the United Kingdom Meteorological Office (UKMO) Global Seasonal Forecast System 5 (GloSea5) is used to investigate the potential predictability of synoptic types within 14 austral ... Read more
Seasonal forecasts for the Limpopo Province in estimating deviations from grazing capacity

Author: Maluleke, P ; Landman, WA ; Malherbe, Johan ; Archer, Emma RM Date: Nov 2018 Application of seasonal forecasts in agriculture has significant potential and realized utility. Other sectors that may also benefit from using seasonal forecasts include (but are not limited to) health, hydrology, water, and energy. This ... Read more
Seasonal forecasts of the SINTEX-F coupled model applied to maize yield and streamflow estimates over north-eastern South Africa

Author: Malherbe, Johan ; Landman, WA ; Olivier, C ; Sakuma, H ; Luo, J-J Date: Jul 2014 Forecasts of a Global Coupled Model for austral summer with a 1 month lead are downscaled to end-of-season maize yields and accumulated streamflow over the Limpopo Province and adjacent districts in northeastern South Africa through application ... Read more
Seasonal forecasts: communicating current climate variability in southern Africa

Author: Landman, WA ; Tadross, M ; Engelbrecht, F ; Archer, Emma RM ; Joubert, A Date: Nov 2011 In southern Africa, seasonal rainfall and temperature forecasts have been made for almost two decades already and these forecasts have been developed to improve the ability of users to cope with fluctuations in rainfall and temperatures on a ... Read more
Seasonal maximum temperature prediction skill over Southern Africa: 1- vs 2-tiered forecasting systems

Author: Lazenby, MJ ; Landman, WA ; DeWitt, DG Date: Sep 2011 This study aimed at testing coupled and uncoupled model performance in predicting southern African seasonal maximum temperatures. Read more
Seasonal precipitation forecast skill over Iran

Author: Shirvani, A ; Landman, WA Date: Jul 2015 This paper examines the skill of seasonal precipitation forecasts over Iran using one two-tiered model, three National Multi-Model Ensemble (NMME) models, and two coupled ocean–atmosphere or one-tiered models. These models are, respectively, ... Read more
Seasonal prediction for Southern Africa: Maximising the skill from forecast systems

Author: Landman, WA Date: Jun 2012 The development of seasonal forecast systems for southern Africa is presented, followed by the justification why certain model configurations have been selected in order to optimise seasonal forecast performance. The skill of the HadGEM3 ... Read more
Seasonal rainfall predictability over the Lake Kariba catchment area

Author: Muchuru, S ; Landman, WA ; DeWitt, D ; Lötter, D Date: Jul 2014 The Lake Kariba catchment area in southern Africa has one of the most variable climates of any major river basin, with an extreme range of conditions across the catchment and through time. Marked seasonal and interannual fluctuations in ... Read more

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