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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 Council votes on top appointments

2003-11-24

The Council of the University of the Free State (UFS) today voted on the filling of four senior vacancies, including three posts at Vice-Rector level and one at the level of Dean.

The Council voted as follows:
- Prof Magda Fourie will be offered the post of Vice-Rector: Academic Planning
- Dr Ezekiel Moraka will be offered the post of Vice-Rector: Student Affairs
- Prof Teuns Verschoor will be offered the post of Vice-Rector: Academic Operations
- Prof Letticia Moja will be offered the post of Dean: Faculty of Health Sciences

Two of the candidates, Prof Teuns Verschoor and Prof Magda Fourie, are currently acting Vice-Rectors at the UFS. Prof Verschoor is acting Vice-Rector for Student Affairs and Prof Fourie is acting Vice-Rector for Academic Planning. Dr Moraka is currently Dean of Student Affairs at the University of Pretoria (UP). Prof Moja is currently the acting Dean of the Faculty of Health Sciences at the UFS.

According to the Rector and Vice-Chancellor of the UFS, Prof Frederick Fourie, the filling of these senior vacancies comes after one of the most thorough search and selection processes ever at the UFS.

“It is wonderful that we are able to celebrate the outcome of this process that has brought forward such excellent candidates who reflect our country’s diversity. It shows that we can achieve the goals of quality and diversity at the same time,” Prof Fourie said.

Prof Magda Fourie (49) received her Ph D on Institutional governance of higher education in transition: a South African perspective from the UFS in 1996. She joined the UFS in 1998, later becoming Director of the Centre for Higher Education Studies and Development and Professor in Higher Education Studies. She said in her declaration of intent her aspiration is to contribute to making the UFS the excellent university it foresees in its vision and mission. Academic planning should position the UFS with regard to its core activities strategically as an institution of excellence that will meet the future from a strong basis of academic integrity and credibility.

Dr Moraka (45) received his Ph D in Education Management on Management of change and conflict resolution by student affairs officers at historically white universities in South Africa from the UP in 2002. He is Dean of Students at the UP since 2001. Before that he was Head of Student Support and Student Social Services at the UP for six years. He was also, among others, a lecturer at a college of education and a pastor of the Dutch Reformed Church in Africa. He said in his declaration of intent that diversity can become so greatly emphasised that people can be driven further apart. Focus should be on moulding a student community where everyone can feel at home, a community which lives together and works together without destroying what is unique to each individual.

Prof Verschoor (53) received his LL D in 1980 at the University of Pretoria on The criminal responsibility of psychopaths and similar figures. He was professor in and Head of the Department of Criminal Law and Medical Law at the UFS for 17 years before becoming Dean of Students in 1994. He said in his declaration of intent that he dreams of the realisation of projects that are awaiting the enthusiastic support, bringing together and empowering of persons involved by a Vice-Rector that wants to see the UFS prosper in an era of continuing dynamic development. In this he would like to make a substantial contribution.

Prof Moja (46) received her MB ChB in 1982 from the University of Natal and her M.Med in Obstetrics and Gynecology in 1990 from the Medical University of South Africa (Medunsa). She became a full professor in 2003 at the UFS and has been acting as Dean of the UFS’s Faculty of Health Sciences since February 2003. She said in her declaration of intent that the challenge for her is to manage change with the ultimate aim of both achieving the vision of the UFS and satisfying the needs of the community. Some of the academic challenges include the training of more people from designated groups and rural areas. Careful planning and integration of the curriculum should be done to ensure that all students perform to their best.

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