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SA now experiencing half-year summers

12 October 2020 | Story Leonie Bolleurs | Photo Supplied

Although several international studies have used temperature metrics to statistically classify their seasonal divisions, a study in which Adriaan van der Walt was involved, would be the first known publication in a South African context using temperature as classification metric.

Gone are the days when we as South Africans would experience a three-month spring season, easing into summer, and then cooling off for three months before we hit winter.

Adriaan van der Walt, Lecturer in the Department of Geography at the University of the Free State (UFS), focuses his research on biometeorology (a specialist discipline exploring the role and climate change in physical and human environments) as well as climatology and geographic information systems.

He recently published an article: ‘Statistical classification of South African seasonal divisions on the basis of daily temperature data’ in the South African Journal of Science.

In this study, which Van der Walt undertook with Jennifer Fitchett, a colleague from the University of the Witwatersrand, data on daily maximum and minimum temperatures was collected from 35 meteorological stations of the South African Weather Service, covering the period between 1980 and 2015.

They went to great lengths to ensure that they had a complete set of data before presenting it to demonstrate seasonal brackets.

First for South Africa

Their statistical seasonal brackets indicate that South Africans now experience longer summers (from October to March), autumn in April and May, winter from June to August, and spring in September.

Although considerable work has been done using rainfall to determine seasonality in Southern Africa, Van der Walt believes that these methods did not work well as there are too many inconsistencies in this approach, as identified by Roffe et al. (2019, South African Geographical Journal). To make matters more complicated – as a semi-arid region, and with desert conditions along the west coast – some regions do not have enough rainfall to use as a classifier.

Temperature, on the other hand, worked well in this study. “Temperature, by contrast, is a continuous variable, and in Southern Africa has sufficient seasonal variation to allow for successful classification,” says Van der Walt.

He continues: “Although several international studies used temperature metrics to statistically classify their seasonal divisions, this study would be the first known publication in a South African context using temperature as classification metric.”

Van der Walt says what we understand as seasons largely relates to phenology – the appearance of blossoms in spring, the colouration and fall of leaves in autumn, and the migration of birds as a few examples. “These phenological shifts are more sensitive to temperature than other climatic variables.”

Seasonal brackets

According to Van der Walt, they believe that a clearly defined and communicated method should be used in defining seasons, rather than just assigning months to seasons.

“One of the most important arguments of our work is that one needs to critically consider breaks in seasons, rather than arbitrarily placing months into seasons, and so we welcome any alternate approaches,” he says.

A number of sectors apply the temperature-based division to their benefit. “For example, in the tourism sector it is becoming increasingly important to align advertising with the season most climatically suitable for tourism,” says Van der Walt.

Temperature-based division is also used to develop adaptive strategies to monitor seasonal changes in temperature under climate change. However, Van der Walt points out that each sector will have its own way of defining seasons. “Seasonal boundaries should nevertheless be clearly communicated with the logic behind them,” he says.

News Archive

UFS in partnership with USA ’s Council on Economic Education

2006-02-01

A visit to the campus of the UFS was part of the recent NCEE workshop. Standing from the left are Prof Soehendro (Chairperson: National Education Standardisation Body of Indonesia), Prof Herman van Schalkwyk (Dean: Faculty of Natural and Agricultural Sciences at the UFS), Prof Elena Reshetnyak (Vice-Dean for International Programs, Kharkiv Polytechnic Institute, Kharkiv, Ukraine) and Mrs Annely Minnaar (local coordinator of the NCEE and professional officer of the UFS Department of Agricultural Economics). Seated are from left Prof Sutjipto ( Chairman of the Indonesian Council on Economic Education) and Dr Patty Elder (Vice-President of the NCEE's national programme).
Photo: Stephen Collett

UFS in partnership with USA ’s Council on Economic Education

A group of 50 teachers in Economics, learning facilitators and lecturers from eight countries attended a ‘train the trainers’ workshop this past week in Bloemfontein. The workshop forms part of the outreach programme of the National Council on Economic Education (NCEE) in the United States of America’s (USA) effort to improve the quality of the training in Economics of teachers and lecturers across the world.

The UFS and the Free State Department of Education are the NCEE’s first partners in Africa. “The initiative started in the Free State because of the connection that existed between the UFS and the NCEE,” said Prof Klopper Oosthuizen, from the UFS Department of Agricultural Economics and initiator of the cooperative agreement with the NCEE.

Three faculties at the UFS are involved in the cooperative agreement namely the Faculty of Natural and Agricultural Sciences, the Faculty of the Humanities and the Faculty of Economic and Management Sciences.

A group of 84 teachers and learning facilitators in the Free State attended the ‘train the teacher’ workshop at the UFS in December 2005 in an effort to improve the quality of Economics classes at schools in the Free State. The last national workshop will take place in June 2006 in Bloemfontein. During this workshop a group of 40 teachers and learning facilitators in the Free State will be trained by the NCEE.

“Because of the success with the programme in the Free State Dr Patty Elder, Vice-President of the NCEE’s national programme, announced during last week’s workshop that the initiative will now be extended to the other provinces in the country,” said Prof Oosthuizen. According to Prof Oosthuizen discussions around a strategy to get the other provinces on board of the programme also took place between Dr Elder and Prof Herman van Schalkwyk, Dean of the UFS Faculty of Natural and Agricultural Sciences. Prof van Schalkwyk will take the lead in this regard.

“The presence of Dr Elder and the executive directors of similar education networks in the Ukraine and Indonesia is an indication of the NCEE’s seriousness with the programme in Africa,” said Prof Oosthuizen.

Prof Oosthuizen explained that South Africa is competing to obtain funds from the NCEE to have a total South African representation in the workshops in the following one-year training period.

South Africa has a good chance of establishing the network quickly because of the presentation of the last national workshop in Bloemfontein in June 2006. “We are going to try to have as much South African representation as possible at this workshop,” said Prof Oosthuizen.

Concurrent with the workshop in June 2006, a programme will be developed that will be attended by at least five other provincial education departments and representatives of five other universities. These representatives will then be able to observe on a first-hand basis how this action learning takes place and how the participating countries plan to establish and expand their networks,” said Prof Oosthuizen.

“The NCEE has been working together with international partners since 1992 to strengthen their Economics teaching systems. They have already succeeded in increasing literacy in Economics of schools in the USA and more than 20 East Block countries. More than 1,5 million learners in the East Block countries have already been served by this initiative,” said Prof Oosthuizen.

According to Prof Oosthuizen the focus of the NCEE has since 2004 moved away from the East Block countries to Africa, Asia, Latin America and the Middle East. The representatives that attended last week’s workshop were from South Africa, Egypt, Jordan, Palestine, Indonesia, Mexico, Paraguay and Uruguay. Countries such as Egypt, who was also present at last week’s workshop, are eager to start a similar network.

Media release
Issued by: Lacea Loader
Media Representative
Tel: (051) 401-2584
Cell: 083 645 2454
E-mail: loaderl.stg@mail.uovs.ac.za
31 January 2006

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