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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 honours young researchers

2006-02-10

Some of the guests attending the recognition function were from the left: Prof Magda Fourie (Vice-Rector: Academic Planning at the UFS), Mr Joseph Smiles (lecturer at the UFS Department of Political Science and Thuthuka grant holder), Prof Frans Swanepoel (Director: Research Development at the UFS) and Dr Carlien Pohl (lecturer at the UFS Department of Microbial, Biochemical and Food Biotechnology and Thuthuka grant holder).
Photo: Leonie Bolleurs

The guest speaker was Prof Jonathan Jansen, Dean: Faculty of Education at the University of Pretoria (UP). He gave tips to young and promising researchers on how to be an outstanding scholar.
What is a Scholar

UFS honours young researchers

The University of the Free State (UFS) last night honoured 24 young researchers who are taking part in the National Research Fund’s (NRF) Thuthuka programme.

The recognition function is the first of its kind at the UFS. “The renewed focus on research development that was recently announced at the official opening of the UFS by the Rector and Vice-Chancellor, Prof Frederick Fourie, is an indication of the institution’s endeavour to create an environment in which research can be improved and flourish. This can only be obtained when researchers are being valued and that is why it is important to honour our young researchers,” said Mrs Annelize Venter, researcher at the UFS Research Development Directorate and coordinator of the programme.

The focus on research was also touched on recently by President Thabo Mbeki during the opening of Parliament when he said: “We will continue to engage the leadership of our tertiary institutions focused on working with them to meet the nation’s expectations with regard to teaching and research. For its part, the government is determined to increase the resource allocation for research and development and innovation, and increase the pool of young researchers."

According to Mrs Venter, research done in 2004 shows that the majority researchers who publish are white males above the age of 50. “Many students who undertake magister studies choose not to conduct research, but rather to do a thesis and additional subjects. This means that research is not stimulated. Students also find it difficult to obtain financial support for postgraduate studies,” she explained.
“Thutuka is a capacity building programme of the NRF that is aimed to
fund and support the qualifications of women and young black scientists and other researchers who do not have a rating for postgraduate research. It is based on a funding partnership between the UFS and the NRF,” said Mrs Venter.

Last night Prof Frans Swanepoel, Director: Research Development at the UFS, added to his by saying: “With the Thuthuka programme we aim to create and sustain a research culture at the UFS, promote international research and train researchers of a high quality and enhance the research capacity at the UFS by focusing on women, black researchers and other promising researchers.”

The programme was started by the NRF in 2001. At that stage only 17 grants were made countrywide. Last year 370 postgraduate students took part in the programme.

According to Mrs Venter the programme was implemented at the UFS in 2003. “At that stage we only had 5 grant holders. This year there are 24 Ph D and magister students on the programme,” she said.

A couple of young promising researchers, who will be participating in the programme in 2007, also attended last night’s recognition function.

The guest speaker was Prof Jonathan Jansen, Dean: Faculty of Education at the University of Pretoria (UP). He gave tips to young and promising researchers on how to be an outstanding scholar.

Nine professors were also congratulated with their promotion to senior research professor, namely Proff Louise Cilliers (Department of English and Classical Languages), James du Preez (Department of Microbial, Biochemical and Food Biotechnology), Johan Grobbelaar (Department of Plant Sciences), Dingie Janse van Rensburg (Centre for Health Systems Research and Development), Dap Louw (Department of Psychology), Philip Nel (Department of Afro-asiatic Studies and Language Practice and Sign Language), Louis Scott (Department of Plant Sciences), Dirk van den Berg (Department of History of Art) and Andries Raath (Department of Constitutional Law and Philosophy of Law).

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

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