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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 trains Kovsies to become great in world terms – Prof Jonathan Jansen
2016-01-19

Description: First-year welcoming 2016 Tags: First-years, UFS First-years

First-year students from the University of the Free State (UFS) recently attended the welcoming ceremony at the Red Square of the Bloemfontein Campus.
Photo: Johan Roux

The University of the Free State (UFS) does not train Kovsies to become great in Bloemfontein or even South Africa. The UFS trains them to become great in the world.

With these words, Prof Jonathan Jansen welcomed the first-year class of 2016 to the “home of Wayde van Niekerk, Rolene Strauss, and the 2015 Varsity Cup rugby champions”.

Prof Jansen, Vice-Chancellor and Rector of the UFS, welcomed the newcomers to the start of the “best time of their lives” on 15 January 2016 at the Red Square of the Bloemfontein Campus. First-years and their parents attended the annual welcoming ceremony.

Prof Jansen congratulated the students on choosing the UFS, and on being part of the elite group that was selected to study at the university.

The UFS received 25 142 applications from newcomers, he said, although there are only about 8 000 places. In 2015, there were roughly 17 500 applications.

He said it was also the most diverse group of applications the UFS had ever received.

Access to education

According to Prof Jansen, the UFS is committed to helping poor students gain access to education, no matter what their background or the colour of their skin.

Lindokuhle Ntuli, the UFS Student Representative Council (SRC) President, said higher education should be more accessible. He said South Africa has allowed education to become commercialised.

“The sooner we as a country realise education isn’t an expense, but rather an investment, the better,” he said.

UFS campaigns

Prof Jansen thanked the UFS SRC for the Right to Learn (R2L) campaign. Launched by the SRC on 30 October 2015, this campaign has already raised R1.2 million to help academically-deserving underprivileged students to study.

“I have launched a campaign myself to raise R100 million between now and September. About 50% of my time will go into this,” Prof Jansen said.

“I will work tirelessly with Lindokuhle and the SRC to raise money.”

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