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12 October 2020 | Story Leonie Bolleurs | Photo Supplied
Adriaan van der Walt
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 welcomes the class of 2010
2010-01-13

Pictured with Prof Jansen are, from the left: Christo Smal (B.Sc. Quantity Surveying student from Bloemfontein), Nicole Tarentaal (LL.B. student from Bloemfontein), Charmoné Swartz (LL.B. student from Kimberley) and Lizé de Witt (B.Sc. Quantity Surveying student from Bloemfontein).
Photo: Stephen Collett


The University of the Free State (UFS) welcomed its first-time entering first-year students on the Main Campus in Bloemfontein this past weekend.

Addressing the new students and their parents at the ceremony, the Rector and Vice-Chancellor Prof. Jonathan Jansen assured the new students and their parents that “they are at the right place”.

“We will not cut corners with your child’s education as we are serious about the quality of the education we provide,” he said to the parents. “We shall make sure that our students are distinguished among graduates from other universities – that they are leaders. Quality is not negotiable.”

Prof. Jansen also said the standards of admission at the UFS would be raised. “We need students of a higher academic standard,” he said.

“Our students will obtain a degree they will be proud of. We are going to put everything into their education and experience here at the UFS so that they can be the best in their field of study.”

He told the new students and their parents that they were safe at the UFS as no first-year student would be initiated anymore. He said that there were other ways to create self-respect and confidence in a young person without having to use initiation.

“It is not enough to have a degree,” he said. “We want to link your degree to thorough preparation for the workplace. Your degree must be accepted globally.”

Prof. Jansen further emphasised the importance of students to understand one another and to get along with one another – especially with those who speak a language different from their own and with a different skin colour than theirs.

“Our students must have respect for one another. This is a value that should be added to your qualification in order for you to be relevant in the workplace anywhere in the world.”

He said the university was busy with a programme to install computer points in all the residences. He also extolled the virtues of the UFS, citing excellence in sport, music, debating and other activities.

Prof. Jansen also reiterated the fact that the first group of 100 first-year students who would be sent overseas to study during the second semester would come from this class of 2010.

“The class of 2010 will change Kovsies. They will be the best students that have ever graduated,” he said.

Media Release
Issued by: Mangaliso Radebe
Assistant Director: Media Liaison
Tel: 051 401 2828
Cell: 078 460 3320
E-mail: radebemt@ufs.ac.za  
12 January 2010
 

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