1,692 Works

Groundnut Yield Estimation (T.Ha-1.Season-1; Shelled) Based On SmithS (1994) Climatic Criteria

R.E. Schulze & M. Maharaj
Rich in protein, groundnuts (Arachis hypogaea) can be eaten raw, cooked or roasted. For optimum yields, groundnuts require a MAP > 700 mm of which > 500 mm should fall over their 5 - 6 month summer growing season (Smith, 1998), although yields can be attained with only 300 mm over the growing season (NDA, 2005). Mean daily temperatures should be in the range of 22 – 28 degree Celsius for optimum growth, with yield...

Extremes (1950 - 2000) Of Maximum Temperatures (C) November

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...

Vegetation Status

SANBI-Biodiversity GIS

Median monthly precipitation (mm) 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...

Passion Fruit: Optimum Growth Areas - Criterion 1: > 330 days per year with a minimum temperature exceeding 2 degree Celsius

R.E. Schulze & M. Maharaj
Passion fruit are believed to have originated from southern Brazil (Kenyaweb, 2005).The most commonly commercially grown of 55 edible species of passion fruit is Passiflora edulis, which consists of perennial woody vines with each producing about 100 fruits per year (RBGK, 2005). In South Africa passion fruit ideally requires a cool subtropical climate for optimum production (Smith, 1998). The vines prefer moderate temperatures throughout the year, with monthly means of daily maxima < 29 degree...

Suitable habitat for Burchell Zebra

SANBI-Biodiversity GIS
The purpose is to provide a preliminary guideline on carrying capacities for game species suited to the Little Karoo. These are expressed as the estimated area (hectares) required per animal for the major habitat types present. It is a guideline for assisting landowners to utilize their veld at sustainable levels. There is no specific combination of game animals that will be suitable for introduction to all of the farms in the Little Karoo. The mix...

Mean 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...

Standard Deviation (C) Of Daily Minimum Temperature March

R.E. Schulze & M. Maharaj
Minimum (Night-Time) temperatures, there is abundant evidence for the climatic limitation of crop distributions to be described by minimum temperatures, from a perspective of crop survival (on Frost for tolerance levels of crops). Many subtropical crops may be killed at 5 degree Celsius already through chilling injury, even in the absence of frost (Chang, 1968). High minima increase respiration loss, thereby decreasing net photosynthesis. Daily minimum temperature time series were derived from over 970 qualifying...

Extremes (1950 - 2000) Of Maximum Temperatures (C) October

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...

Heat Units (Standard Deviation) - October

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...

Monthly Means Of Daily Average Temperature (C) May

R.E. Schulze & M. Maharaj
Under conditions of natural vegetation, mean temperatures are used to distinguish between three broad thermal divisions of plants, viz. mega-thermal plants, which require mean monthly temperatures above 20 degree Celsius for at least 4 months of the year; micro-thermal plants, which grow where 8 months or longer have means below 10 degree Celsius; and the meso-thermal plants of the mid-latitudes, which cover most of South Africa, and whose physiology is adapted to the strong seasonal...

Above Ground Herbaceous Biomass (gC/sq.m)

CSIR
Above Ground Herbaceous Biomass (AGBherb) is predominantly grasses, but also forbs, restios, sedges. It is based on published relationships between rainfall and yearly grass production, reduced proportionately to take into account competition by trees (TCF). AGBherbvaries greatly through the year – reaching a peak near the end of the growing and declining to near zero by the beginning of spring, especially in the presence of fire and/or herbivory. Units: average gC/m2within 1km x 1km pixel

Total precipitation for the month (mm) 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...

Ruggedness Index - Eastern Cape

SANEDI
Purpose: This data set was created for the WASA project and the Department of Energy, South Africa. The wind resource maps were designed specifically for inclusion in GIS-based strategic environmental assessments (SEA) for wind power in Western Cape and parts of Northern and Eastern Cape. Methodology: Reference is made to the information and documentation available from www.wasaproject.info and www.wasa.csir.co.za. Limitations: The data set is limited by the operational envelopes of the wind atlas methodology and...

Seasonal mean near-surface (2m) temperature (°C) change from the median projected for 2036-2065, relative to present (1976 - 2005), for SON season under the RCP 4.5 pathway

SMHI
Seasonal (SON) mean near-surface (2m) temperature (°C) change from the median projected for 2036-2065, 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 temperature averages, which are used to generate projections of seasonal change....

Rainfall days per month 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...

Position of Agulhas Current at satellite track 020 in AGUHYCOM using technique described in Malan et. al (2018) JGR

Neil Malan
Identification of core position of the Agulhas Current, as plotted in Fig. 3 of Malan et. al. (2018)

Rainfall days per month (> 2mm) 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...

Climatically Suitable Growth Areas for Eucalyptus fraxinoides

R.E. Schulze & M. Maharaj
Fast growing, medium to tall and low maintenance species which is tolerant of low moisture conditions found in areas with MAP as low as 150 mm, Eucalyptus fraxinoides is native to the coastal ranges/escarpments of southeastern New South Wales and Victoria in Australia (CSIRO, 2005). It grows optimally in quite a narrow band of MATs between 14 and 16 degree Celsius (Kunz, 2004). Eucalyptus fraxinoides, the timber of which is used in construction and flooring...

Seasonal mean near-surface (2m) temperature (°C) change from the 10% percentile projected for 2066 - 2095, relative to present (1976 - 2005), for DJF season under the RCP 4.5 pathway

SMHI
Seasonal (DJF) mean near-surface (2m) temperature (°C) 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 temperature averages, which are used to generate projections of seasonal...

Root Mean Square Difference between the nine ensemble member change anomalies of the seasonal mean near-surface (2m) temperature for the 10% percentile for 2036 - 2065 relative to 1976-2005, for the JJA season, under the RCP 4.5 pathway

SMHI
Root Mean Square Difference for seasonal (JJA) mean near-surface (2m) temperature (°C) change from the 10% percentile projected for 2036-2065, 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 temperature averages, which are used...

Bush Encroachment and Land Cover Change

Kerryn Warren & Wim Hugo
* The dataset shows landcover change between 1990 (lcov_1990) and 2013 (lcov_2013). * Attribute information includes ; pagenumber, mapcode12 (vegetation type), dn_new (aboveground carbon values-DMt/ha), lcov_1990, lcov_2013, parent1990 (general landcover name), parent2013, old_new (landcover change), parent_old_new (landcover change by name), dn_ave_1990 (average for each landcover in 1990), dn_ave_2013, dn_ave_change (average carbon change between 1990 and 2013); and boolean information for the following: bush encroachment, grass encroachment, perturbation, degradation, restoration, habitat loss. * Landcover data entries...

STEP - Planning Domain

SANBI-Biodiversity GIS
A map of the STEP planning domain, based on the coastline, and cadastral and municipal boundaries where possible. The boundary was defined to include the thicket vegetation found east of the Duiwenhoks River and west of the Great Kei River. Thicket vegetation west of this planning domain (i.e. towards Cape Town) was not incorporated, considering that it has already been taken into account in the Cape Action Plan for the Environment (Cowling et al. 1999)....

Mean Maize Yield (T/Ha/Season) Long Season Hybrid Plant Date: 15 December

R.E. Schulze & N.J. Walker
This data set contains Maize, Zea mays L. in South Africa and is the country`s most important field and grain crop. Objectives of the study was to simulate maize yields, and their inter-annual, at a spatial resolution of Quaternary Catchments for 12 different combinations of three plant dates, viz. 15 October, 15 November and 15 December. This was done to evaluate which hybrid lengths and plant dates give the highest yields irrespective of plant dates...

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