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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

Moshoeshoe Memorial Lecture to focus on Leadership challenges

2006-03-27

Lecture to focus on Leadership challenges

n Thursday 25 May 2006 – Africa Day – the University of the Free State (UFS) will host the inaugural King Moshoeshoe Memorial Lecture in honour of this great African leader and nation-builder.

Prof Njabulo Ndebele, internationally renowned writer and academic, and Vice-Chancellor of the University of Cape Town (UCT), will deliver the inaugural lecture at the Main Campus in Bloemfontein on the topic: Reflections on the Leadership Challenges in South Africa.

“I see the lecture as part of a larger debate on leadership models, particularly the concept of African leadership, as well as the ongoing discourse about nation-building and reconciliation,” says Prof Frederick Fourie, Rector and Vice-Chancellor of the UFS.

According to Prof Fourie, the Moshoeshoe project was launched at the UFS in 2004 to coincide with South Africa’s first decade of democracy and was part of the University’s centenary celebrations, having been founded in 1904.

“Through this project the UFS seeks to honour a great African leader and demonstrate our commitment to transformation so as to create a truly inclusive and non-racial university,” said Prof Fourie.

“As the founder of the Basotho nation, King Moshoeshoe is widely credited for his exceptional style of leadership, displaying the characteristics of diplomacy, reconciliation and peaceful co-existence in his efforts to unite diverse groups into one nation,” said Prof Fourie.

As part of its ongoing Moshoeshoe project, the UFS commissioned a television documentary programme on the life and legacy of King Moshoeshoe. This was completed in 2004 and broadcast on SABC 2 later that year.

For further information, Me Tumi Tabane can be contacted at (051) 401-2828 or tabaneme.stg@mail.uovs.ac.za.

Abridged curriculum vitae of Njabulo S Ndebele

Professor Njabulo S Ndebele is currently Vice-Chancellor and Principal of UCT.

Njabulo Ndebele began his term of office at UCT in July 2000, following tenure as a scholar in residence at the Ford Foundation’s headquarters in New York. He joined the Foundation in September 1998, immediately after a five-year term of office as Vice-Chancellor and Principal of the University of the North in Sovenga, at the then Northern Province. Previously he served as Vice-Rector of the University of the Western Cape. Earlier positions include Chair of the Department of African Literature at the University of the Witwatersrand; and Pro-Vice-Chancellor, Dean, and Head of the English Department at the National University of Lesotho.

An established author, Njabulo Ndebele recently published a novel The Cry of Winnie Mandela to critical acclaim. An earlier publication Fools and Other Stories won the Noma Award, Africa’s highest literary award for the best book published in Africa in 1984. His highly influential essays on South African literature and culture were published in a collection Rediscovery of the Ordinary.

Njabulo Ndebele served as President of the Congress of South African Writers for many years. As a public figure he is known for his incisive insights in commentaries on a range of public issues in South Africa. He holds honorary doctorates from Universities in the Netherlands, Japan, South Africa and the United States of America. He is also a Fellow of UCT.

Njabulo Ndebele is also a key figure in South African higher education. He has served as Chair of the South African Universities Vice-Chancellor’s Association from 2002-2005, and served on the Executive Board of the Association of African Universities since 2001. He has done public service in South Africa in the areas of broadcasting policy, school curriculum in history, and more recently as chair of a government commission on the development and use of African languages as media of instruction in South African higher education. He recently became President of the Association of the AAU and Chair of the Southern African Regional Universities Association (SARUA).

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

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