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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 appoints Prof Francis Petersen as Vice-Chancellor and Rector

2016-12-02

Prof Francis Petersen

The Council of the University of the Free State (UFS) is pleased to announce that it has decided to appoint Prof Francis Petersen as Vice-Chancellor and Rector of the UFS.

Announcing the decision to appoint Prof Petersen today (Friday 2 December 2016) during the quarterly Council meeting on the Bloemfontein Campus, the Chairperson of the UFS Council, Judge Ian van der Merwe, said the university was fortunate to be able to appoint a candidate of such good quality to the position.

Prof Petersen, Deputy Vice-Chancellor: Institutional Innovation at the University of Cape Town (UCT), and Prof Lis Lange, Vice-Rector: Academic at the UFS, were in line for the position. The university’s Selection Committee expressed equal preference for both and the two candidates were therefore recommended to Council for the position.

“It has been a truly participatory and transparent selection process, which has assisted in the Council being able to make this decision. The higher-education sector has been through a difficult and challenging time during the past few months and the Council is thankful that a leader like Prof Petersen can head the university in 2017 and beyond,” said Judge Van der Merwe.

In his statement of intent, which was submitted earlier as part of the application for the post, Prof Petersen indicated that it is important to imagine the UFS’s location in South Africa and Africa, to realise the challenges within this context, now and in the future, so as to sharpen the university’s focus to become a more inclusive, academic excellent institution, embedded in a culture of innovation. “Therefore, the ideal of academic excellence must be supported by an institutional framework of diversity and inclusivity. The Academic Project should focus on a unique educational experience for every UFS student, the enhancement of student throughput-rate in academic programmes through dedicated academic support, graduate attributes, and curriculum change and renewal,” he said. He furthermore stated that research and innovation must focus on impact and international visibility. “It is thus not only the increase in research and innovation output, but the quality and impact thereof.”

Prof Petersen was previously the Dean of Engineering and the Built Environment at UCT. He brings to the position of Vice-Chancellor and Rector his extensive experience of management in both the industry and academic sectors. He has been the executive head of strategy at Anglo American Platinum and head of the Department of Chemical Engineering at the Cape Technikon (now Cape Peninsula University of Technology). He is a member of the UCT Council, non-executive director on the Board of Pragma Holdings, non-executive director on the Board of the Unlimited Group, and Chairman of the Board of Trustees of the Seedcap (Venture Capital) Trust. Among others, he previously served as member on the Board of the Council of Scientific and Industrial Research, the National Advisory Council on Innovation, and the Council of the Academy of Science of South Africa.

He graduated from Stellenbosch University with a BEng (Chem Eng), MEng (Metal Eng), and PhD (Eng) degrees and completed a short course on Financial Skills for Executive Management. He is a recipient of the Ernest Oppenheimer Memorial Trust Award for research excellence, and was visiting professor at the Cape Technikon and extraordinary professor in the Department of Chemical Engineering at Stellenbosch University. He is a regular reviewer of journals, and member of a range of editorial boards for international journals.

Prof Petersen is also a registered professional engineer with the Engineering Council of South Africa and a Fellow of both the South African Institute of Mining and Metallurgy, and the South African Academy of Engineers.

Prof Petersen succeeds Prof Jonathan Jansen, who stepped down as Vice-Chancellor and Rector of the UFS on 31 August 2016. An international executive search agency specialising in academic appointments has assisted the UFS Council in its search for top-quality candidates.

Released by:

Lacea Loader (Director: Communication and Brand Management)
Telephone: +27 51 401 2584 | +27 83 645 2454
Email: news@ufs.ac.za | loaderl@ufs.ac.za
Fax: +27 51 444 6393

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