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Browsing by Author "Malherbe, Johan"

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Adapting asphalt pavements to climate change challenges

Author: Mokoena, Refiloe ; Mturi, Georges AJ ; Maritz, Johan ; Malherbe, Johan ; O'Connell, Johannes S Date: Oct 2019 Performance grade specifications for bituminous binders focus on the evaluation of bitumen properties based on the loading and environmental conditions under which the material will be subjected to in the field. The temperature of the asphalt ... 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
The Bidecadel climate cycle : Alive and well

Author: Malherbe, Johan ; Smit, I Date: Sep 2018 We consider rainfall variability over the Lowveld in northeastern South Africa during the last 8 decades and demonstrate the persistence of a bi-decadal rainfall cycle in the region. We also note associations with the Southern Annular Mode ... Read more
Can human-induced land degradation be distinguished from the effects of rainfall variability? A case study in South Africa

Author: Wessels, Konrad J ; Prince, SD ; Malherbe, Johan ; Small, J ; Frost, PE ; Van Zyl, D Date: Jan 2007 Advanced Very High Resolution Radiometer (AVHRR), Normalized Difference Vegetation Index data (NDVI, I km (2), 1985-2003) and modelled net primary production (NPP, 8 km (2), 1981-2000) data were used to estimate vegetation production in South ... 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 Extreme Climate Index (ECI), a tool for monitoring regional extreme events

Author: Malherbe, Johan ; Iyahen, E ; Engelbrecht, Francois A ; Chamunorwa, M ; Helmschrot, J Date: 2018 The Extreme Climate Index (ECI) is an objective, multi-hazard index capable of tracking changes in the frequency or magnitude of extreme weather events in Africa. The index is geared towards identifying broad-scale climate extremes that may ... Read more
High resolution model projections of tropical cyclone landfall over southern Africa under enhanced anthropogenic forcing

Author: Malherbe, Johan ; Engelbrecht, F ; Landman, W ; Engelbrecht, C Date: Sep 2011 Tropical cyclone landfall within the southwest Indian Ocean (SWIO) basin occurs on average about 3 times per year over Mozambique and Madagascar. Rainfall associated with tropical cyclones over the interior of southern Africa can also cause ... Read more
Multi-model analysis of expected future trends in the landfall of tropical systems from the Southwest Indian Ocean over the eastern parts of southern Africa

Author: Malherbe, Johan ; Engelbrecht, F ; Landman, W ; Engelbrecht, C Date: Sep 2010 An analysis was performed on the simulations of various Global Circulation Models regarding the change in favourability of broad circulation anomalies in the lower atmosphere for landfall and further westward penetration of tropical systems ... 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
Projected changes in tropical cyclones over the South West Indian Ocean under different extents of global

Author: Muthige, Mavhungu S ; Malherbe, Johan ; Engelbrecht, Francois A ; Grab, S ; Beraki, Asmerom F ; Maisha, Thizwilondi R ; Van der Merwe, Jacobus H Date: Apr 2018 The Paris Agreement achieved in December 2015 established that the signatory countries should pursue to hold the increase in global average temperature to below 2°C relative to the preindustrial period and to strive to limit the temperature ... Read more
Relevance of rangeland degradation in semiarid Northeastern South Africa to the nonequilibrium theory

Author: Wessels, Konrad J ; Prince, SD ; Carroll, M ; Malherbe, Johan Date: Apr 2007 According to the nonequilibrium theory, livestock grazing has a limited effect on long-term vegetation productivity of semiarid rangelands, which is largely determined by rainfall. The communal lands in northeastern South Africa contain ... 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
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
Statistical downscaling of multi-decadal climate change projections: Bridging the gap between climate models and the end-user

Author: Landman, WA ; Engelbrecht, FA ; Malherbe, Johan ; Van der Merwe, J Date: Sep 2013 Multi-decadal regional climate projections are assimilated into a statistical model in order to produce an ensemble of mid-summer maximum temperature for southern Africa. The statistical model uses atmospheric thickness fields (geopotential ... Read more
A synoptic decomposition of rainfall over the Cape south coast of South Africa

Author: Engelbrecht, CJ ; Landman, WA ; Engelbrecht, FA ; Malherbe, Johan Date: May 2015 A synoptic climatology is derived for the Cape south coast region of South Africa by application of the self-organizing map (SOM) technique. The SOM is applied to average daily low-level circulation fields, as represented by sea-level pressure ... Read more
Towards bridging the gap between climate change projections and maize producers in South Africa

Author: Landman, WA ; Engelbrecht, Francois A ; Hewitson, B ; Malherbe, Johan ; Van der Merwe, Jacobus H Date: May 2017 Multi-decadal regional projections of future climate change are introduced into a linear statistical model in order to produce an ensemble of austral mid-summer maximum temperature simulations for southern Africa. The statistical model uses ... Read more
Tropical systems from the southwest Indian Ocean making landfall over the Limpopo River Basin, southern Africa: a historical perspective

Author: Malherbe, Johan ; Engelbrecht, FA ; Landman, WA ; Engelbrecht, CJ Date: Mar 2011 The study provides perspective on the contribution of landfalling tropical systems (cyclones, depressions, storms and lows) from the southwest Indian Ocean (SWIO) towards rainfall over the eastern interior of southern Africa, over the period ... Read more

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