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Browsing by Author "Landman, WA"

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Advances towards the development of a cloud-resolving model in South Africa

Author: Bopape, Mary-Jane M ; Engelbrecht, F ; Randall, DA ; Landman, WA Date: Sep 2014 Recent advances in supercomputing have made feasible the numerical integration of high-resolution cloud resolving models (CRMs). CRMs are being used increasingly for high-resolution operational numerical weather prediction and for research ... Read more
The all-year rainfall region of South Africa: Satellite rainfall-estimate perspective

Author: Engelbrecht, CJ ; Landman, WA ; Engelbrecht, FA Date: Sep 2012 Climate 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
Anthropogenic radiative forcing of southern African and Southern Hemisphere climate variability and change

Author: Engelbrecht, FA ; Landman, WA ; Ndarana, T Date: Oct 2014 This paper explores the hypothesis that the more realistic depiction of the atmosphere's ability to absorb and release radiation in atmospheric model simulations, through the more realistic representation of the time-varying concentrations ... Read more
Assessment of GloSea4 seasonal forecasts for SADC and the global oceans

Author: Landman, WA ; Graham, R ; Knight, J ; Engelbrecht, C ; Olivier, C Date: Oct 2012 The main objective of this research is to demonstrate the skill of the UK Met Office Hadley Centre’s coupled global seasonal forecasting system, GloSea4, as a seasonal forecasting tool for the Southern African Development Community (SADC) and ... Read more
Assessment of GloseA4 seasonal forecasts for SADC and the global oceans

Author: Landman, WA ; Graham, R ; Knight, J ; Engelbrecht, C ; Olivier, C Date: Sep 2012 Seasonal forecast skill over southern Africa may improve through the combination of forecasts. In the southern African region, however, only a small number of institutions have the capability to run global models operationally which can feed ... Read more
Atmospheric modelling

Author: Landman, WA ; Engelbrecht, F Date: Mar 2010 The basic concepts of models and how they are used for weather and climate projection are presented. Read more
Atmospheric modelling and prediction at time scales from days to seasons

Author: Landman, WA ; Engelbrecht, F ; Park, R ; Bopape, Mary-Jane M ; Lötter, D Date: 01 Sep 2010 Daily weather forecasts are skilful and are initial-value problems, while at the seasonal time scale, slowly varying surface forcing, for example from the tropical Pacific Ocean, can induce atmospheric anomalies that are sufficiently long-lasting ... Read more
Atmospheric modelling for seasonal prediction at the CSIR

Author: Landman, WA ; Engelbrecht, FA ; McGregor, JL ; van der Merwe, JH Date: Oct 2014 Three aspects of seasonal forecast modelling when using an atmospheric general circulation model (AGCM) are presented in this paper. The first aspect deals with the verification of simulations created by forcing the AGCM at its lower boundary ... Read more
The bi-decadal rainfall cycle, Southern Annular Mode and tropical cyclones over the Limpopo River Basin, southern Africa

Author: Malherbe, Johan ; Landman, WA ; Engelbrecht, FA Date: Jun 2014 The association between bi-decadal rainfall variability over southern Africa and the rainfall contributed by tropical cyclonic systems from the Southwest Indian Ocean (SWIO) provides a potential means towards understanding decadal-scale ... Read more
Can intraseasonal to decadal forecasts benefit from from consideration of lunar forcing?

Author: Malherbe, Johan ; Landman, WA ; Engelbrecht, FA Date: Oct 2014 A possible forcing mechanism for intra-seasonal rainfall distribution to bi-decadal climate variability is explored. The atmospheric response to external forcing is demonstrated at a daily and annual time scale by noting variation in the ... Read more
The CCAM as operational seasonal forecast system

Author: Landman, WA ; Engelbrecht, F ; Park, R Date: Oct 2011 The procedure to build an optimised seasonal prediction system that includes the prediction of global SST to force the CCAM is explained. Read more
Climate change is catchy – but when will it really hurt?

Author: Sweijd, ML ; Wright, CY ; Westwood, A ; Rouault, Marjolaine J ; Landman, WA ; MacKenzie, ML ; Nuttall, JJC ; Mahomed, H ; Cousins, T ; Winter, K ; Berhoozi, F ; Kalule, B ; Kruger, P ; Govender, T ; Minakawa, N Date: Dec 2015 Concern and general awareness about the impacts of climate change in all sectors of the social-ecological-economic system is growing as a result of improved climate science products and information, as well as increased media coverage of the ... Read more
Downscaled climate change projections over northeastern South Africa: Implications for streamflow

Author: Mkhwanazi, M ; Landman, WA ; Engelbrecht, FA ; Olivier, C Date: Sep 2015 The study assesses the impacts of anthropogenic forcing on seasonal streamflows over northeastern South Africa by using both dynamically and statistically downscaled multi-decadal climate change projections. The statistical model approach is ... Read more
Dynamical seasonal climate prediction using an ocean-atmosphere coupled climate model developed in partnership between South Africa and the IRI

Author: Beraki, Asmerom F ; De Witt, DG ; Landman, WA ; Olivier, C Date: Feb 2014 The recent increase in availability of high-performance computing (HPC) resources in South Africa allowed the development of an ocean–atmosphere coupled general circulation model (OAGCM). The ECHAM4.5-South African Weather Service (SAWS) ... Read more
Dynamical seasonal prediction of Southern African summer precipitation

Author: Yuan, C ; Tozuka, T ; Landman, WA ; Yamagata, T Date: 2014 Prediction skill for southern African (16°–33°E, 22°–35°S) summer precipitation in the Scale Interaction Experiment-Frontier coupled model is assessed for the period of 1982–2008. Using three different observation datasets, deterministic ... Read more
ENSO and implications on rainfall characteristics with reference to maize production in the Free State Province of South Africa

Author: Moeletsi, ME ; Walker, S ; Landman, WA Date: Aug 2011 El Niño-Southern Oscillation (ENSO) plays an important role in the inter-annual variability of rainfall in most parts of southern Africa. The effects of ENSO on the rainy season characteristics and possible impacts on rain-fed maize production ... Read more
ENSO forecasts in South Africa

Author: Landman, WA ; Beraki, Asmerom F Date: Nov 2015 The SST prediction systems currently being used at the Council for Scientific and Industrial Research (CSIR) and the South African Weather Service (SAWS) are presented. In particular, the skill of these systems to predict Niño3.4 SST and how ... Read more
The high-resolution global SST forecast set of the CSIR

Author: Landman, WA ; DeWitt, DG ; Lee, D-E Date: Sep 2011 The evolution of global sea-surface temperature (SST) anomalies over several months ahead is often relatively predictable. Subsequently employing predicted SST in atmospheric general circulation models (AGCMs) can provide means of generating ... Read more
How the International Research Institute for Climate and Society has contributed towards seasonal climate forecast modelling and operations in South Africa

Author: Landman, WA Date: Jun 2014 The production of seasonal forecasts on a routine basis in South Africa started in the early 1990s. Most of the modelling then was based on linear statistical approaches. The subsequent evolution of the seasonal forecasting enterprise in South ... Read more
I get all the news I need on the weather report, October 2010: Presentation

Author: Landman, WA ; Engelbrecht, F ; Landman, S Date: Oct 2010 In order to produce a weather forecast, the initial state of the atmosphere needs to be entered into the forecast model taking into account factors such as temperature, wind and moisture. However, the scale of some atmospheric motions is far ... Read more

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