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Journal articles on the topic 'South African Weather Service'

Author: Grafiati

Published: 4 June 2021

Last updated: 5 February 2022

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1

de Coning, E., and E. R. Poolman. "South African Weather Service operational satellite based precipitation estimation technique: applications and improvements." Hydrology and Earth System Sciences Discussions 7, no. 6 (2010): 8837–71. http://dx.doi.org/10.5194/hessd-7-8837-2010.

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Abstract. Extreme weather related to heavy or more frequent precipitation events seem to be a likely possibility for the future of our planet. While precipitation measurements can be done by means of rain gauges, the obvious disadvantages of point measurements are driving meteorologists towards remotely sensed precipitation methods. In South Africa more sophisticated and expensive nowcasting technology such as radar and lightning networks are available, supported by a fairly dense rain gauge network of about 1500 gauges. In the rest of southern Africa rainfall measurements are more difficult t

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2

de Coning, E., and E. Poolman. "South African Weather Service operational satellite based precipitation estimation technique: applications and improvements." Hydrology and Earth System Sciences 15, no. 4 (2011): 1131–45. http://dx.doi.org/10.5194/hess-15-1131-2011.

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Abstract. Extreme weather related to heavy or more frequent precipitation events seem to be a likely possibility for the future of our planet. While precipitation measurements can be done by means of rain gauges, the obvious disadvantages of point measurements are driving meteorologists towards remotely sensed precipitation methods. In South Africa more sophisticated and expensive nowcasting technology such as radar and lightning networks are available, supported by a fairly dense rain gauge network of about 1500 daily gauges. In the rest of southern Africa rainfall measurements are more diffi

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Muofhe, Tshimbiluni Percy, Hector Chikoore, Mary-Jane Morongwa Bopape, Nthaduleni Samuel Nethengwe, Thando Ndarana, and Gift Tshifhiwa Rambuwani. "Forecasting Intense Cut-Off Lows in South Africa Using the 4.4 km Unified Model." Climate 8, no. 11 (2020): 129. http://dx.doi.org/10.3390/cli8110129.

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Mid-tropospheric cut-off low (COL) pressure systems are linked to severe weather, heavy rainfall and extreme cold conditions over South Africa. They occur during all the above and often result in floods and snowfalls during the winter months, disrupting economic activities and causing extensive damage to infrastructure. This paper examines the evolution and circulation patterns associated with cases of severe COLs over South Africa. We evaluate the performance of the 4.4 km Unified Model (UM) which is currently used operationally by the South African Weather Service (SAWS) to simulate daily ra

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Ntsangwane, Lucky, Brighton Mabasa, Venkataraman Sivakumar, Nosipho Zwane, Katlego Ncongwane, and Joel Botai. "Quality control of solar radiation data within the South African Weather Service solar radiometric network." Journal of Energy in Southern Africa 30, no. 4 (2019): 51–63. http://dx.doi.org/10.17159/2413-3051/2019/v30i4a5586.

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This study reports on the performance results of the Baseline Surface Radiation Network (BSRN) quality control procedures applied to the solar radiation data, from September 2013 to December 2017, within the South African Weather Service radiometric network. The overall percentage performance of the SAWS solar radiation network based on BSRN quality control methodology was 97.79%, 93.64%, 91.60% and 92.23% for long wave downward irradiance (LWD), global horizontal irradiance (GHI), diffuse horizontal irradiance (DHI) and direct normal irradiance (DNI), respectively, with operational problems l

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Tonder, S. Van, and J. H. Van Rooyen. "An explanatory model of South African yellow maize futures prices." Corporate Ownership and Control 9, no. 3 (2012): 204–16. http://dx.doi.org/10.22495/cocv9i3c1art5.

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This study attempts to identify the important variables that may affect yellow maize futures prices in the South African derivatives market. Data was obtained from the South African Futures Exchange, a division of the Johannesburg Securities Exchange. Weekly data on the rand-dollar exchange rates were obtained from the South African Reserve Bank (SARB). Monthly data regarding import volumes, export volumes, maize consumption and maize stocks in South Africa are available from South African Grain Information Service (SAGIS). Fifteen variables that may be used to forecast futures prices were ide

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Rautenbach, Christo, Michael A. Barnes, David W. Wang, and James Dykes. "Southern African Wave Model Sensitivities and Accuracies." Journal of Marine Science and Engineering 8, no. 10 (2020): 773. http://dx.doi.org/10.3390/jmse8100773.

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Numerous studies have identified the complexities of the wave climatology around the South African coast, but limited studies have investigated these complex dynamics in the available literature. Several freely available parameterized wave boundary conditions are produced around southern Africa. However, none of these are fully spectral outputs from global or larger regional spectral wave models. This constraint results in local engineering and scientific organizations, reconstructing their own spectral boundary conditions. For coastal models, this is a reasonable assumption, assuming that the

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Kaspar, F., J. Helmschrot, A. Mhanda, et al. "The SASSCAL contribution to climate observation, climate data management and data rescue in Southern Africa." Advances in Science and Research 12, no. 1 (2015): 171–77. http://dx.doi.org/10.5194/asr-12-171-2015.

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Abstract. A major task of the newly established "Southern African Science Service Centre for Climate Change and Adaptive Land Management" (SASSCAL; www.sasscal.org) and its partners is to provide science-based environmental information and knowledge which includes the provision of consistent and reliable climate data for Southern Africa. Hence, SASSCAL, in close cooperation with the national weather authorities of Angola, Botswana, Germany and Zambia as well as partner institutions in Namibia and South Africa, supports the extension of the regional meteorological observation network and the im

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Singh, Jyotsna, and Andries Kruger. "Is the summer season losing potential for solar energy applications in South Africa?" Journal of Energy in Southern Africa 28, no. 2 (2017): 52. http://dx.doi.org/10.17159/2413-3051/2017/v28i2a1673.

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Seasonal trends using in situ sunshine duration (SD) and satellite, incoming shortwave solar radiation (SIS) data for South Africa over a period up to six decades were investigated. Trend analysis was applied to SD data of 22 sunshine-recording stations from the South African Weather Service that cover the length and breadth of South Africa. Satellite application facility on climate monitoring provided the high-resolution derived SIS for the period 1983–2013. A number of stations show a statistically significant decreasing trend in SD in all four seasons on a seasonal scale. Declines (number o

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Mabasa, Brighton, Meena D. Lysko, Henerica Tazvinga, Sophie T. Mulaudzi, Nosipho Zwane, and Sabata J. Moloi. "The Ångström–Prescott Regression Coefficients for Six Climatic Zones in South Africa." Energies 13, no. 20 (2020): 5418. http://dx.doi.org/10.3390/en13205418.

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The South African Weather Service (SAWS) manages an in situ solar irradiance radiometric network of 13 stations and a very dense sunshine recording network, located in all six macroclimate zones of South Africa. A sparsely distributed radiometric network over a landscape with dynamic climate and weather shifts is inadequate for solar energy studies and applications. Therefore, there is a need to develop mathematical models to estimate solar irradiation for a multitude of diverse climates. In this study, the annual regression coefficients, a and b, of the Ångström–Prescott (AP) model, which can

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Blamey, R. C., A. M. Ramos, R. M. Trigo, R. Tomé, and C. J. C. Reason. "The Influence of Atmospheric Rivers over the South Atlantic on Winter Rainfall in South Africa." Journal of Hydrometeorology 19, no. 1 (2018): 127–42. http://dx.doi.org/10.1175/jhm-d-17-0111.1.

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Abstract A climatology of atmospheric rivers (ARs) impinging on the west coast of South Africa (29°–34.5°S) during the austral winter months (April–September) was developed for the period 1979–2014 using an automated detection algorithm and two reanalysis products as input. The two products show relatively good agreement, with 10–15 persistent ARs (lasting 18 h or longer) occurring on average per winter and nearly two-thirds of these systems occurring poleward of 35°S. The relationship between persistent AR activity and winter rainfall is demonstrated using South African Weather Service rainfa

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Ciolkosz, Daniel. "SASRAD: An hourly-timestep solar radiation database for South Africa." Journal of Energy in Southern Africa 20, no. 1 (2009): 25–34. http://dx.doi.org/10.17159/2413-3051/2009/v20i1a3299.

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A methodology is presented for the correction and filling of solar radiation data at sites within South Africa, with the aim of creating a continuous, hourly-timestep dataset for multiple locations. Data from twenty sites, collected by the Agricultural Research Council, are analysed with regard to the amount of data requiring offset or multiplier adjustment, as well as the amount of bad data. A range correction algorithm is implemented based on the 90th percentile (10% exceedance) hourly irradiance, as a function of site latitude and elevation. The resulting, corrected data set is given the ti

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Tennant, Warren J., Zoltan Toth, and Kevin J. Rae. "Application of the NCEP Ensemble Prediction System to Medium-Range Forecasting in South Africa: New Products, Benefits, and Challenges." Weather and Forecasting 22, no. 1 (2007): 18–35. http://dx.doi.org/10.1175/waf979.1.

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Abstract The National Centers for Environmental Prediction (NCEP) Ensemble Forecasting System (EFS) is used operationally in South Africa for medium-range forecasts up to 14 days ahead. The use of model-generated probability forecasts has a clear benefit in the skill of the 1–7-day forecasts. This is seen in the forecast probability distribution being more successful in spanning the observed space than a single deterministic forecast and, thus, substantially reducing the instances of missed events in the forecast. In addition, the probability forecasts generated using the EFS are particularly

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Isioye, Olalekan A., Ludwig Combrinck, Joel O. Botai, and Cilence Munghemezulu. "The Potential for Observing African Weather with GNSS Remote Sensing." Advances in Meteorology 2015 (2015): 1–16. http://dx.doi.org/10.1155/2015/723071.

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When compared to the wide range of atmospheric sensing techniques, global navigation satellite system (GNSS) offers the advantage of operating under all weather conditions, is continuous, with high temporal and spatial resolution and high accuracy, and has long-term stability. The utilisation of GNSS ground networks of continuous stations for operational weather and climate services is already in place in many nations in Europe, Asia, and America under different initiatives and organisations. In Africa, the situation appears to be different. The focus of this paper is to assess the conditions

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Eiselt, Kai-Uwe, Frank Kaspar, Thomas Mölg, Stefan Krähenmann, Rafael Posada, and Jens O. Riede. "Evaluation of gridding procedures for air temperature over Southern Africa." Advances in Science and Research 14 (June 15, 2017): 163–73. http://dx.doi.org/10.5194/asr-14-163-2017.

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Abstract. Africa is considered to be highly vulnerable to climate change, yet the availability of observational data and derived products is limited. As one element of the SASSCAL initiative (Southern African Science Service Centre for Climate Change and Adaptive Land Management), a cooperation of Angola, Botswana, Namibia, Zambia, South Africa and Germany, networks of automatic weather stations have been installed or improved (http://www.sasscalweathernet.org). The increased availability of meteorological observations improves the quality of gridded products for the region. Here we compare in

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Sinclair, S., and G. G. S. Pegram. "A comparison of ASCAT and modelled soil moisture over South Africa, using TOPKAPI in land surface mode." Hydrology and Earth System Sciences 14, no. 4 (2010): 613–26. http://dx.doi.org/10.5194/hess-14-613-2010.

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Abstract. In this paper we compare two independent soil moisture estimates over South Africa. The first estimate is a Soil Saturation Index (SSI) provided by automated real-time computations of the TOPKAPI hydrological model, adapted to run as a collection of independent 1 km cells with centres on a grid with a spatial resolution of 0.125°, at 3 h intervals. The second set of estimates is the remotely sensed ASCAT Surface Soil Moisture product, temporally filtered to yield a Soil Wetness Index (SWI). For the TOPKAPI cells, the rainfall forcing used is the TRMM 3B42RT product, while the evapotr

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Stein, T. H. M., W. Keat, R. I. Maidment, et al. "An Evaluation of Clouds and Precipitation in Convection-Permitting Forecasts for South Africa." Weather and Forecasting 34, no. 1 (2019): 233–54. http://dx.doi.org/10.1175/waf-d-18-0080.1.

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Abstract Since 2016, the South African Weather Service (SAWS) has been running convective-scale simulations to assist with forecast operations across southern Africa. These simulations are run with a tropical configuration of the Met Office Unified Model (UM), nested in the Met Office global model, but without data assimilation. For November 2016, convection-permitting simulations at 4.4- and 1.5-km grid lengths are compared against a simulation at 10-km grid length with convection parameterization (the current UM global atmosphere configuration) to identify the benefits of increasing model re

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Korhonen, K., E. Giannakaki, T. Mielonen, et al. "Atmospheric boundary layer top height in South Africa: measurements with lidar and radiosonde compared to three atmospheric models." Atmospheric Chemistry and Physics 14, no. 8 (2014): 4263–78. http://dx.doi.org/10.5194/acp-14-4263-2014.

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Abstract. Atmospheric lidar measurements were carried out at Elandsfontein measurement station, on the eastern Highveld approximately 150 km east of Johannesburg in South Africa throughout 2010. The height of the planetary boundary layer (PBL) top was continuously measured using a Raman lidar, PollyXT (POrtabLe Lidar sYstem eXTended). High atmospheric variability together with a large surface temperature range and significant seasonal changes in precipitation were observed, which had an impact on the vertical mixing of particulate matter, and hence, on the PBL evolution. The results were compa

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18

Ayodele, Temitope R., Adisa A. Jimoh, Josiah L. Munda, and John T. Agee. "Statistical analysis of wind speed and wind power potential of Port Elizabeth using Weibull parameters." Journal of Energy in Southern Africa 23, no. 2 (2012): 30–38. http://dx.doi.org/10.17159/2413-3051/2012/v23i2a3160.

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This paper analyses wind speed characteristics and wind power potential of Port Elizabeth using statistical Weibull parameters. A measured 5–minute time series average wind speed over a period of 5 years (2005 - 2009) was obtained from the South African Weather Service (SAWS). The results show that the shape parameter (k) ranges from 1.319 in April 2006 to 2.107 in November 2009, while the scale parameter (c) varies from 3.983m/s in May 2008 to 7.390 in November 2009.The average wind power density is highest during Spring (September–October), 256.505W/m2 and lowest during Autumn (April-May), 1

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Beraki, Asmerom F., David G. DeWitt, Willem A. Landman, and Cobus Olivier. "Dynamical Seasonal Climate Prediction Using an Ocean–Atmosphere Coupled Climate Model Developed in Partnership between South Africa and the IRI." Journal of Climate 27, no. 4 (2014): 1719–41. http://dx.doi.org/10.1175/jcli-d-13-00275.1.

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Abstract 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) Modular Oceanic Model version 3 (MOM3-SA) is the first OAGCM to be developed in Africa for seasonal climate prediction. This model employs an initialization strategy that is different from previous versions of the model that coupled the same atmosphere and ocean models. Evaluation of hindcasts performed with the model revealed that the OAGCM is succes

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Landman, Willem A., David DeWitt, Dong-Eun Lee, Asmerom Beraki, and Daleen Lötter. "Seasonal Rainfall Prediction Skill over South Africa: One- versus Two-Tiered Forecasting Systems." Weather and Forecasting 27, no. 2 (2012): 489–501. http://dx.doi.org/10.1175/waf-d-11-00078.1.

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Abstract Forecast performance by coupled ocean–atmosphere or one-tiered models predicting seasonal rainfall totals over South Africa is compared with forecasts produced by computationally less demanding two-tiered systems where prescribed sea surface temperature (SST) anomalies are used to force the atmospheric general circulation model. Two coupled models and one two-tiered model are considered here, and they are, respectively, the ECHAM4.5–version 3 of the Modular Ocean Model (MOM3-DC2), the ECHAM4.5-GML–NCEP Coupled Forecast System (CFSSST), and the ECHAM4.5 atmospheric model that is forced

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Kabanda, Tibangayuka A. "Geographical Variability of Drought in Northern South Africa." Journal of Geography and Geology 9, no. 1 (2017): 53. http://dx.doi.org/10.5539/jgg.v9n1p53.

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This study focuses on the geographical variation of drought in northern South Africa (hereafter NSA). It assesses seasonal rainfall characteristics to determine drought occurrence and persistence in NSA. Seasonal rainfall data for the period 1960-2009 is used and was obtained from the South Africa Weather Service (SAWS). Rainfall stations in NSA are well distributed, forming a dense network of point-source data samples. Standardised Precipitation Indices (SPIs) are employed to detect drought occurrence and intensity at different locations. Analysis of SPIs with respect to time suggests that th

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Gyamfi, C., J. M. Ndambuki, and R. W. Salim. "A Historical Analysis of Rainfall Trend in the Olifants Basin in South Africa." Earth Science Research 5, no. 1 (2016): 129. http://dx.doi.org/10.5539/esr.v5n1p129.

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<span style="font-size: 10.5pt; font-family: 'Times New Roman','serif'; mso-bidi-font-size: 12.0pt; mso-fareast-font-family: 宋体; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;" lang="EN-US">A set of homogeneity test methods and the Mann-Kendall trend test were applied on historical rainfall records of the Olifants Basin to detect changes in rainfall pattern under a changing climate. In total, historical rainfall records from 13 stations obtained from the South African Weather Service (SAWS) and the Department of Water Affairs (DW

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Korhonen, K., E. Giannakaki, T. Mielonen, et al. "Atmospheric boundary layer top height in South Africa: measurements with lidar and radiosonde compared to three atmospheric models." Atmospheric Chemistry and Physics Discussions 13, no. 7 (2013): 17407–50. http://dx.doi.org/10.5194/acpd-13-17407-2013.

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Abstract. Atmospheric lidar measurements were carried out at Elandsfontein measurement station, on the eastern Highveld approximately 150 km east of Johannesburg in South Africa (SA) throughout 2010. The height of the planetary boundary layer (PBL) top was continuously measured using a~Raman lidar, PollyXT (POrtabLe Lidar sYstem eXTended). High atmospheric variability together with a large surface temperature range and significant seasonal changes in precipitation were observed, which had an impact on the vertical mixing of particulate matter (PM), and hence, on the PBL evolution. The results

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Tharaga, Phumudzo Charles, Abraham Stephanus Steyn, and Gesine Maria Coetzer. "Climate Change Impacts on Temperature and Chill Unit Trends for Apple (Malus domestica) Production in Ceres, South Africa." Atmosphere 12, no. 6 (2021): 740. http://dx.doi.org/10.3390/atmos12060740.

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Climate is an essential part of crop production, determining the suitability of a given region for deciduous fruit products such as apples (Malus domestica). It influences the yield and quality of fruits. There is strong evidence of global and regional-scale climate change since the advent of the industrial era. In South Africa, mean surface temperatures have revealed a warming trend over the last century. This study aimed to assess the impact of climate change on temperature and chill unit trends for apple production in Ceres, South Africa. The daily positive Utah chill units (DPCU) model was

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Zinner, T., C. Forster, E. de Coning, and H. D. Betz. "Validation of the Meteosat storm detection and nowcasting system Cb-TRAM with lightning network data – Europe and South Africa." Atmospheric Measurement Techniques 6, no. 6 (2013): 1567–83. http://dx.doi.org/10.5194/amt-6-1567-2013.

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Abstract. In this paper, recent changes to the Meteosat thunderstorm TRacking And Monitoring algorithm (Cb-TRAM) are presented as well as a validation of Cb-TRAM against data from the European ground-based LIghtning NETwork (LINET) of Nowcast GmbH and the South African Weather Service Lightning Detection Network (SAWS LDN). Validation is conducted along the well-known skill measures probability of detection (POD) and false alarm ratio (FAR) on the basis of Meteosat/SEVIRI pixels as well as on the basis of thunderstorm objects. The values obtained demonstrate specific limitations of Cb-TRAM, as

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Mabasa, Brighton, Meena D. Lysko, Henerica Tazvinga, Nosipho Zwane, and Sabata J. Moloi. "The Performance Assessment of Six Global Horizontal Irradiance Clear Sky Models in Six Climatological Regions in South Africa." Energies 14, no. 9 (2021): 2583. http://dx.doi.org/10.3390/en14092583.

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This study assesses the performance of six global horizontal irradiance (GHI) clear sky models, namely: Bird, Simple Solis, McClear, Ineichen–Perez, Haurwitz and Berger–Duffie. The assessment is performed by comparing 1-min model outputs to corresponding clear sky reference 1-min Baseline Surface Radiation Network quality controlled GHI data from 13 South African Weather Services radiometric stations. The data used in the study range from 2013 to 2019. The 13 reference stations are across the six macro climatological regions of South Africa. The aim of the study is to identify the overall best

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Zinner, T., C. Forster, E. de Coning, and H. D. Betz. "Validation of the METEOSAT storm detection and nowcasting system Cb-TRAM with lightning network data – Europe and South Africa." Atmospheric Measurement Techniques Discussions 6, no. 1 (2013): 1269–310. http://dx.doi.org/10.5194/amtd-6-1269-2013.

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Abstract. In this manuscript, recent changes to the DLR METEOSAT thunderstorm TRacking And Monitoring algorithm (Cb-TRAM) are presented as well as a validation of Cb-TRAM against the European ground-based LIghtning NETwork data (LINET) of Nowcast GmbH and Lightning Detection Network (LDN) data of the South African Weather Service (SAWS). The validation is conducted along the well known skill scores probability of detection (POD) and false alarm ratio (FAR) on the basis of METEOSAT/SEVIRI pixels as well as on the basis of thunderstorm objects. The values obtained demonstrate the limits of Cb-TR

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Jimmy, Raven, Pramanathan Govender, Hassan Bencherif, and Matthew Moodley. "TREND-RUN model application of surface temperature and its implications for South African forestry and reforestation using local weather services data." REFORESTA, no. 7 (June 28, 2019): 50–72. http://dx.doi.org/10.21750/refor.7.05.67.

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Rautenbach, Christo, Julia C. Mullarney, and Karin R. Bryan. "Parallel computing efficiency of SWAN 40.91." Geoscientific Model Development 14, no. 7 (2021): 4241–47. http://dx.doi.org/10.5194/gmd-14-4241-2021.

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Abstract. Effective and accurate ocean and coastal wave predictions are necessary for engineering, safety and recreational purposes. Refining predictive capabilities is increasingly critical to reduce the uncertainties faced with a changing global wave climatology. Simulating WAves in the Nearshore (SWAN) is a widely used spectral wave modelling tool employed by coastal engineers and scientists, including for operational wave forecasting purposes. Fore- and hindcasts can span hours to decades, and a detailed understanding of the computational efficiencies is required to design optimized operat

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Koenig, Marianne, and Estelle de Coning. "The MSG Global Instability Indices Product and Its Use as a Nowcasting Tool." Weather and Forecasting 24, no. 1 (2009): 272–85. http://dx.doi.org/10.1175/2008waf2222141.1.

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Abstract The European geostationary Meteosat Second Generation (MSG) satellite offers a variety of channels to use for various purposes, including nowcasting of convection. A number of applications have also been developed to make use of these new capabilities for nowcasting, especially for the detection and prediction of severe weather. The MSG infrared channel selection makes it possible to assess the air stability in preconvective, that is, still cloud-free, conditions. Instability indices are traditionally derived from radiosonde profiles. Such indices typically combine measures of the the

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Roberts, G., M. J. Wooster, W. Xu, et al. "LSA SAF Meteosat FRP Products: Part 2 – Evaluation and demonstration of use in the Copernicus Atmosphere Monitoring Service (CAMS)." Atmospheric Chemistry and Physics Discussions 15, no. 11 (2015): 15909–76. http://dx.doi.org/10.5194/acpd-15-15909-2015.

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Abstract. Characterising the dynamics of landscape scale wildfires at very high temporal resolutions is best achieved using observations from Earth Observation (EO) sensors mounted onboard geostationary satellites. As a result, a number of operational active fire products have been developed from the data of such sensors. An example of which are the Fire Radiative Power (FRP) products, the FRP-PIXEL and FRP-GRID products, generated by the Land Surface Analysis Satellite Applications Facility (LSA SAF) from imagery collected by the Spinning Enhanced Visible and Infrared Imager (SEVIRI) on-board

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Roberts, G., M. J. Wooster, W. Xu, et al. "LSA SAF Meteosat FRP products – Part 2: Evaluation and demonstration for use in the Copernicus Atmosphere Monitoring Service (CAMS)." Atmospheric Chemistry and Physics 15, no. 22 (2015): 13241–67. http://dx.doi.org/10.5194/acp-15-13241-2015.

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Abstract. Characterising the dynamics of landscape-scale wildfires at very high temporal resolutions is best achieved using observations from Earth Observation (EO) sensors mounted onboard geostationary satellites. As a result, a number of operational active fire products have been developed from the data of such sensors. An example of which are the Fire Radiative Power (FRP) products, the FRP-PIXEL and FRP-GRID products, generated by the Land Surface Analysis Satellite Applications Facility (LSA SAF) from imagery collected by the Spinning Enhanced Visible and Infrared Imager (SEVIRI) onboard

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Klappenbach, F., M. Bertleff, J. Kostinek, et al. "Accurate mobile remote sensing of XCO<sub>2</sub> and XCH<sub>4</sub> latitudinal transects from aboard a research vessel." Atmospheric Measurement Techniques 8, no. 12 (2015): 5023–38. http://dx.doi.org/10.5194/amt-8-5023-2015.

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Abstract. A portable Fourier transform spectrometer (FTS), model EM27/SUN, was deployed onboard the research vessel Polarstern to measure the column-average dry air mole fractions of carbon dioxide (XCO2) and methane (XCH4) by means of direct sunlight absorption spectrometry. We report on technical developments as well as data calibration and reduction measures required to achieve the targeted accuracy of fractions of a percent in retrieved XCO2 and XCH4 while operating the instrument under field conditions onboard the moving platform during a 6-week cruise on the Atlantic from Cape Town (Sout

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YAMAZAKI, Eri. "Service Learning in South African Higher Education." Comparative Education 2019, no. 59 (2019): 179–93. http://dx.doi.org/10.5998/jces.2019.59_179.

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Okoh, D. I., L. A. McKinnell, and P. J. Cilliers. "Developing an ionospheric map for South Africa." Annales Geophysicae 28, no. 7 (2010): 1431–39. http://dx.doi.org/10.5194/angeo-28-1431-2010.

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Abstract. The development of a map of the ionosphere over South Africa is presented in this paper. The International Reference Ionosphere (IRI) model, South African Bottomside Ionospheric Model (SABIM), and measurements from ionosondes in the South African Ionosonde Network, were combined within their own limitations to develop an accurate representation of the South African ionosphere. The map is essentially in the form of a computer program that shows spatial and temporal representations of the South African ionosphere for a given set of geophysical parameters. A validation of the map is att

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Oosthuizen, Christiaan, Barend Van Wyk, Yskandar Hamam, Dawood Desai, and Yasser Alayli. "The Use of Gridded Model Output Statistics (GMOS) in Energy Forecasting of a Solar Car." Energies 13, no. 8 (2020): 1984. http://dx.doi.org/10.3390/en13081984.

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For many years, primary weather forecasting services (Global Forecast System (GFS) and the European Centre for Medium-Range Weather Forecasts (ECMWF)) have been made available to the public through global Numerical Weather Prediction (NWP) models estimating a multitude of general weather variables in a variety of resolutions. Secondary services such as weather experts Meteomatics AG use data and improve the forecasts through various methods. They tailor for the specific needs of customers in the wind and solar power generation sector as well as data scientists, analysts, and meteorologists in

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Naidoo, Anthony. "Black South African Students' Use of Counseling Service." Psychological Reports 84, no. 1 (1999): 49–50. http://dx.doi.org/10.2466/pr0.1999.84.1.49.

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This paper reports the demographic and summative annual data for presenting concerns of students seeking counseling at a Black South African university. Rankings of the major presenting concerns identified by the clients are presented.

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Canning, Simon. "Elections herald overhaul of South African health service." Nursing Standard 8, no. 31 (1994): 10. http://dx.doi.org/10.7748/ns.8.31.10.s19.

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Pienaar, Jacobus, and Sebastiaan Rothmann. "Suicide Ideation in the South African Police Service." South African Journal of Psychology 35, no. 1 (2005): 58–72. http://dx.doi.org/10.1177/008124630503500104.

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Little information exists regarding the suicide ideation of uniformed members of the South African Police Service (SAPS). The objectives of this study were to determine the level of suicide ideation of police members and to determine the differences between the suicide ideation of various demographic groups. Across-sectional survey design was used. Stratified random samples ( N = 1781) were taken of police members of eight provinces in South Africa. The Adult Suicide Ideation Questionnaire and a biographical questionnaire were administered. The results indicated that 8.30% of the sample showed

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Meyer, Michael E., and Jean Steyn. "Nurturing isolation in the South African police service." Policing: An International Journal of Police Strategies & Management 32, no. 1 (2009): 108–27. http://dx.doi.org/10.1108/13639510910937148.

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Kock, Ruwayne, and Mark Burke. "Managing Talent in the South African Public Service." Public Personnel Management 37, no. 4 (2008): 457–70. http://dx.doi.org/10.1177/009102600803700406.

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Dovey, Ken. "Leadership development in a South African health service." International Journal of Public Sector Management 15, no. 7 (2002): 520–33. http://dx.doi.org/10.1108/09513550210448562.

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Karaivanova, Aneta, and Anastas Mishev. "Introduction to the Special Issue on E-Infrastructures for Excellent Science: Advances in Life Sciences, Digital Cultural Heritage and Climatology." Scalable Computing: Practice and Experience 19, no. 2 (2018): iii—iv. http://dx.doi.org/10.12694/scpe.v19i2.1401.

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It is our pleasure to present this special issue of scientific journal Scalable Computing: Practice and Experience. In this issue (Volume 19, No 2 – June 2018), we selected 14 papers which have gone through review and revision, and represent novel results in Life Sciences, Digital Cultural Heritage, Climatology using state-of-the-art e-infrastructures. E-Infrastructures are currently addressing the challenging needs of researchers for digital services in terms of networking, computing and data management. Virtual research environments (VRE) integrate resources across all layers of the e-infras

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Giddy, Julia K., Jennifer M. Fitchett, and Gijsbert Hoogendoorn. "Insight into American tourists’ experiences with weather in South Africa." Bulletin of Geography. Socio-economic Series 38, no. 38 (2017): 57–72. http://dx.doi.org/10.1515/bog-2017-0034.

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Abstract Weather and climate are often important factors determining the success of a tourism destination and resultant satisfaction among tourists. This is particularly true for South Africa due the predominance of outdoor tourist attractions. Increasing numbers of international tourists have visited South Africa since the fall of apartheid, particularly those from the United States (U.S.), which is an important market for South African tourism. Therefore, this paper seeks to examine a sample of American tourists’ experience with day-to-day weather and climatic conditions in South Africa. The

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Samways, Michael. "Impacts of extreme weather and climate change on South African dragonflies." BioRisk 5 (December 30, 2010): 73–84. http://dx.doi.org/10.3897/biorisk.5.843.

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Coetzee, Liza (ESM), and Madeleine Stiglingh. "Disabled Child Expense And The South African Revenue Service." International Business & Economics Research Journal (IBER) 13, no. 5 (2014): 1149. http://dx.doi.org/10.19030/iber.v13i5.8781.

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As from the 2010 year of assessment, a taxpayer-parent caring for a disabled child can only deduct an expense necessarily incurred and paid in consequence of the childs disability, if it also appears on the South African Revenue Services prescribed list of disability expenses. The aim of the research was to evaluate the completeness of this list. A questionnaire was developed to be used for semi-structured interviews with 20 parents of severely disabled children. These interviews provided real-life examples of expenses which do not appear on the list, but which seem to be necessarily incurred

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Thomas, A., and D. Lindsay. "Organisational culture at a South African food service company." South African Journal of Business Management 34, no. 4 (2003): 45–52. http://dx.doi.org/10.4102/sajbm.v34i4.691.

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The aim of the present exploratory study was to examine whether congruence exists between the organisational culture perceived to be evident at Compass, South Africa and the strategic objectives of the company. Information from the administration of the Harrison and Stokes (1992) instrument to measure existing and preferred organisational culture orientations was obtained from a sample of 86 employees representing two employee groupings at the company. The findings indicate that a difference in perception of the existing culture is evident between the CEO and the two employee groups and that t

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Beukes, Jacques, J. J. Prinsloo, and Theuns G. Pelser. "Customer Service Expectations from South African Alcoholic Beverage Suppliers." Alternation: Interdisciplinary Journal for the Study of the Arts and Humanities in Southern Africa 25, no. 1 (2018): 127–53. http://dx.doi.org/10.29086/2519-5476/2018/v25n1a7.

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Barnard, Antoni, and Nirvana Simbhoo. "South African managers in public service: On being authentic." International Journal of Qualitative Studies on Health and Well-being 9, no. 1 (2014): 20630. http://dx.doi.org/10.3402/qhw.v9.20630.

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Hammett, Daniel. "Cuban Intervention in South African Health Care Service Provision*." Journal of Southern African Studies 33, no. 1 (2007): 63–81. http://dx.doi.org/10.1080/03057070601136574.

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