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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

Community of Qwaqwa gives Prof Petersen a warm Basotho welcome

2017-05-16

Description: Prof Petersen with Basotho hat and blanket Tags: Prof Petersen with Basotho hat and blanket

Prof Francis Petersen, Vice-Chancellor and Rector of the University of the Free State
Photo: Ian van Straaten

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Various stakeholders pledged their support to the newly-appointed Vice-Chancellor and Rector of the University of the Free State (UFS), Prof Francis Petersen, during the first in a series of welcoming events that was held at the Qwaqwa Campus on Thursday 11 May 2017.

A message of support and welcome from the Paramount Queen of the Bakoena Royal Council, Mofumahadi Mathokoana Mopeli, took everybody in attendance back three decades to the time when the campus was first established.

“The Qwaqwa Campus of the then University of the North was created to swell this area and the broader Eastern Free State with intellectual capacity,” she said.

“It is with this in mind that we encourage you, Prof Petersen, to continue upholding the best of your predecessors. Search for what they could not achieve and learn from that. Traditional leadership in this area will always be a friend to the university,” she added.

Prof Petersen received a warm Basotho
welcome from Morena Thokoana Mopeli and
Paramount Queen Mofumahadi Mathokoana Mopeli of
the Bakoena Royal Council. With them is
Mrs Cheslyn Petersen.
Photo: Thabo Kessah

The Thabo Mofutsanyana Education District was represented by the Acting District Director, Lindiwe Mabaso, who expressed the district’s pride in being associated with the university.

“Our district is excelling in Mathematics and Science, and this can be attributed to the educators that we get from the Qwaqwa Campus. We are proud to say that we are number one nationally when it comes to Mathematics and Science, and this is through the support we get from the campus. Our schools will continue to be centres of excellence under the new leadership of Prof Petersen,” she said.

Staff and students weigh in

Both Nehawu and Uvpersu expressed their optimism in working with Prof Petersen.

Branch chairperson of Nehawu, Teboho Pitso, said the union appreciated the fact that Prof Petersen was taking over the leadership of the institution at a very difficult time, both institutionally and nationally.

“As workers, we are faced with a lot of challenges and we hope that none of us will be retrenched under your leadership,” he said to an appreciative audience consisting of various internal and external stakeholders.

Acting Chairperson of UVPERSU, Khethiwe Biyo, said the workers’ union was happy that Prof Petersen believed in teamwork.

“Your commitment in working with us is appreciated. We look forward to learning from you about institutional innovation,” she said.

Students were represented by the Qwaqwa Campus SRC President, Njabulo Mwali, who expressed the need for a deeper and detailed transformation process.

“Your expertise and skills have set you above all other aspirant applicants for this position, and we hope that we will learn a lot on this journey,” he said.

“We at the UFS are actively, intentionally,
and continuously engaged in promoting
diversity.”

"Ensure fairness"

In his response, Prof Petersen emphasised the importance of inclusivity and innovativeness. He said, “Staff and students at the three sites of learning must do all they can to ensure that the UFS realises its goal of being an inclusive institution, one that provides equal access and opportunities to everyone, makes a conscious effort to prevent discrimination, and ensure fairness.”

“Being committed to inclusivity means that we at the UFS are actively, intentionally, and continuously engaged in promoting diversity. This diversity is expressed through our people and through the curriculum, and in the way we work with our communities to promote awareness, empathy, and understanding of the complex ways individuals interact. As you know, our ultimate goal as a university is not only to educate young people up to the point that they graduate. What they learn during their time with us should help shape them into people who can think innovatively in order to address the challenges that face us in the 21st century,” he said.

The Qwaqwa Campus Chorale and the award-winning choir from The Beacon Secondary School in Phuthaditjhaba provided the entertainment.

Similar events will respectively be hosted on the South and Bloemfontein Campuses on 18 and 19 May 2017.

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