1,689 Works

Field Guide to the Offshore Marine Invertebrates of South Africa

Lara Atkinson & Kerry Sink
Long-term environmental monitoring is important to enable an improved understanding of how changing conditions affect marine environments. Without rigorous data from the past, we are unable to detect, quantify or adapt to changes in the environment now or into the future. Offshore benthic ecosystems of South Africa's Exclusive Economic Zone have, in the past, been poorly studied and local taxonomic knowledge of offshore invertebrates has been considered sparse. Marine invertebrates are one of the most...

Number of days for Minimum Temperature over 90th percentile for Current Climate (1950-1999)

Christopher Jack
Model Run: Control - Current Climate (Observed/current climate as modelled by climate model). The Self-Organizing Map Downscaling (SOMD) was developed at the Climate Systems Analysis Group (CSAG)[1], University of Cape Town. This is a leading empirical downscaled technique and provides meteorological station level response to global climate change forcing (See Hewitson and Crane (2006) for methodological details and Wilby et al. (2004) for a review of this and other statistical downscaling methodologies). Downscaling of a...

The ASCA April 2016 processed 24Hz CTD profile data for stations 001 - 005

Juliet Hermes, Lisa Beal, Shane Elipot, Deirdre Byrne & RHI
The Agulhas System Climate Array (ACSA) is a mooring array and is designed to provide long-term observations of the Agulhas Current`s volume, heat and salt transport and its variability from mesoscale (eddies), through seasonal to interannual timescales. The ASCA shelf and tall moorings extend 200 km offshore along decending TOPEX/Jason satellite ground track # 96, through the core of the Agulhas Current, with CPIES measurements extending the array to 300 km offshore of Port Elizabeth....

Minimum of Maximum Temperature for Near Future (2046-2065)

Christopher Jack
Model Run: Near future (2046 - 2065) (Near future (2046 - 2065)). The Self-Organizing Map Downscaling (SOMD) was developed at the Climate Systems Analysis Group (CSAG)[1], University of Cape Town. This is a leading empirical downscaled technique and provides meteorological station level response to global climate change forcing (See Hewitson and Crane (2006) for methodological details and Wilby et al. (2004) for a review of this and other statistical downscaling methodologies). Downscaling of a General...

Medium Voltage Stations

Eskom
Eskom provided the BioEnergy Atlas with a set of data to describe their current and planned infrastructure: * High voltage transmission lines and substations; * Medium voltage distribution lines and substations; * Planned new transmission lines; * Planned new substations. All of these were aggregated to meso-zones (planning and analysis zones used for the Atlas) in the following way: * Distribution and transmission lines: presence or absence of lines; * Substations: count of medium voltage...

Winter Rainfall Crops

A. Fourie
The dataset includes all field boundaries in the Western Cape province, with the associated winter crops. The digitising of the fields where done from Spot 5 satellite imagery of 2011 and 2012, as well as aerial photography of 2010. The low-level aerial survey of 2013 was conducted to observe crops per field per farm in order to populate the attributers for fields digitised as above. Some ground survey was carried out where aerial observation could...

SUG-BUT: Butanol Fermentation from Sugarcane (Catchments)

Wim Hugo
* Technical Challenges - Rapid development of the feedstock source will be required, since the ethanol content of fuel cannot be increased incrementally. In the lead-up to full production at a facility, the sugar may be processed through traditional channels. * Cost Challenges - None of the projects are feasible; producing ethanol within the cost range of petrol in the recent past is only possible through subsidisation of the sugar input costs. Capital costs are...

Frequency of Frost Occurrences

R.E. Schulze & M. Maharaj
Neither the median dates of first and last frosts nor the median duration of the frost period give any indications on the number of years within the 50 year time series of temperature values used in the study (Schulze and Maharaj, 2004) in which frost actually occurred, nor on the number of frost occurrences within a year, nor on the variability of frost occurrences from year to year. In the mapping statistics of frost over...

Climatically Suitable Growth Areas for Eucalyptus GxC (grandis x camaldulensis)

R.E. Schulze & M. Maharaj
Eucalyptus GxC (grandis x camaldulensis) is a warm climate hybrid, thriving when MAT > 16 degree Celsius. It is, however, a hybrid which is very susceptible to frost and snow damage at MATs < 16 degree Celsius (Kunz, 2004).

The ASCA June 2018 raw Current Meter data at Mooring C at all depths

Juliet Hermes, Lisa Beal, Shane Elipot, Deirdre Byrne & RHI
The Agulhas System Climate Array (ACSA) is a mooring array and is designed to provide long-term observations of the Agulhas Current`s volume, heat and salt transport and its variability from mesoscale (eddies), through seasonal to interannual timescales. The ASCA shelf and tall moorings extend 200 km offshore along decending TOPEX/Jason satellite ground track # 96, through the core of the Agulhas Current, with CPIES measurements extending the array to 300 km offshore of Port Elizabeth....

Unserviced Organic Waste - Solid Waste and Waste Water

Wim Hugo
Data was derived from two other data sets generated by the BioEnergy Atlas: * organic component of solid waste (serviced), from households; * organic component of waste water (serviced), also from households.

BioEnergy Atlas Synopsis Report

W.J. Hugo
The BioEnergy Atlas project was commisioned by Department of Science and Technology and managed by SAEON. It has produced a range of outputs, in both electronic and printed format. The data sets, attendant metadata and fact sheets (non-spatial data inputs) are all available online and can be accessed via an interactive web-based atlas, a search facility and an interactive decision-support tool. Reports dealing with the main themes of the Atlas, as well as case studies...

Minimum of Maximum Temperature for Near Future (2046-2065)

Christopher Jack
Model Run: Near future (2046 - 2065) (Near future (2046 - 2065)). The Self-Organizing Map Downscaling (SOMD) was developed at the Climate Systems Analysis Group (CSAG)[1], University of Cape Town. This is a leading empirical downscaled technique and provides meteorological station level response to global climate change forcing (See Hewitson and Crane (2006) for methodological details and Wilby et al. (2004) for a review of this and other statistical downscaling methodologies). Downscaling of a General...

Minimum of Minimum Temperature for Far Future (2080 - 2100)

Christopher Jack
Model Run: Far future (2080 - 2100) (Far future (2080 - 2100)). The Self-Organizing Map Downscaling (SOMD) was developed at the Climate Systems Analysis Group (CSAG)[1], University of Cape Town. This is a leading empirical downscaled technique and provides meteorological station level response to global climate change forcing (See Hewitson and Crane (2006) for methodological details and Wilby et al. (2004) for a review of this and other statistical downscaling methodologies). Downscaling of a General...

Rainfall days per month (> 10mm) for Current Climate (1950-1999)

Christopher Jack
Model Run: Control - Current Climate (Observed/current climate as modelled by climate model). The Self-Organizing Map Downscaling (SOMD) was developed at the Climate Systems Analysis Group (CSAG)[1], University of Cape Town. This is a leading empirical downscaled technique and provides meteorological station level response to global climate change forcing (See Hewitson and Crane (2006) for methodological details and Wilby et al. (2004) for a review of this and other statistical downscaling methodologies). Downscaling of a...

Soil Organic Carbon – Reduced by Land Use (gC/sq.m)

CSIR
Soil Organic Carbon (SOC) represents all the organic carbon in the soil to a depth of 1m. SOC is derived from the data provided by the Africa Soil Information System (AfSIS). The organic carbon of soil is reduced by various land uses and agricultural practices and to account for this, the carbon in the top 300mm of the natural soil (SOC0-300) derived from AfSIS was reduced by a factor of 0.2 – 0.5 using the...

Vapour Pressure Deficit (kPa) August

R.E. Schulze, R.D. Chapman & M. Maharaj
Daily values of vapour pressure deficit (VPD) are, however, required far more frequently, particularly when modelling crop potential evaporation using the Penman- Monteith equation (Penman, 1948). In this section a method used to estimate VPD is outlined, the method is verified and then maps and statistics of VPD are presented. The hypothesis in estimating daily values of VPD at any specified location in South Africa is that actual VP, actual vapour pressure, which is considered...

Heat Units (June)

R.E. Schulze & M. Maharaj
The concept of the heat unit (or degree day), known since the mid-18th century already, revolves around the development of a plants or organism`s being dependent upon the accumulated heat to which it was subjected during its lifetime, or else during a certain developmental stage. This measure of accumulated heat is known as physiological time. In general it holds that the lower the temperature, the slower the rate of growth and development of plants and...

SUG-BUT: Butanol Fermentation from Sugarcane

Wim Hugo
* Technical Challenges - Rapid development of the feedstock source will be required, since the ethanol content of fuel cannot be increased incrementally. In the lead-up to full production at a facility, the sugar may be processed through traditional channels. * Cost Challenges - None of the projects are feasible; producing ethanol within the cost range of petrol in the recent past is only possible through subsidisation of the sugar input costs. Capital costs are...

Standard Deviations Of Daily Maximum Relative Humidity (%) December

R.E. Schulze, R.D. Chapman & M. Maharaj
Daily minimum and maximum relative humidity is necessary as relative humidity, defined for practical purposes as the ratio of actual to saturated vapour pressure, expressed as a percentage generally varies considerably in the course of a day because, despite actual vapour pressure, ed, remaining relatively constant, saturated vapour pressure, ea, varies curvilinearly with temperature. The minimum RH of a day is thus experienced during the hottest part of the day when ea is high and...

Seasonal total rainfall (mm per 3-month season) change from the 10% percentile projected for 2066-2095, relative to present (1976 - 2005), for MAM season under the RCP 4.5 pathway

SMHI
Seasonal (MAM) rainfall (mm per month) change from the 10% percentile projected for 2066-2095, relative to present (1976 - 2005), under the RCP 4.5 pathway for the southern African region. To generate the image, nine coarse General Circulation Models (GCM) are downscaled to a finer spatial resolution (0.44°x 0.44°) using the Rossby Centre regional model (RCA4) forcing its lateral boundaries. The model simulated daily rainfall averages, which are used to generate projections of seasonal change....

Hippo

SANBI-Biodiversity GIS

Extremes (1950 - 2000) Of Minimum Temperatures (C) July

R.E. Schulze & M. Maharaj
When days with very low or very high temperatures are experienced, the question is invariably asked as to whether that `extreme` minimum or maximum temperature was a record, either for the country or province, or for a specific location or month of the year. It is for that reason that `extremes` of temperatures, at both ends of the spectrum, were extracted from the daily temperature database generated by Schulze and Maharaj (2004) for the 51...

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