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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

Triumph in the face of adversity
2016-04-29

Description: Glory NSH Tags: Glory NSH

Glory, one of fourteen NSH bursary recipients during the UFS Autumn Graduations.

At the University of the Free State (UFS) Autumn Graduation Ceremony held from 12-15 April 2016, on the Bloemfontein Campus, a record number of fourteen beneficiaries of the No Student Hungry (NSH) Bursary Programme received their degrees. This is an achievement they all feel they could not have reached, were it not for the support by NSH.

The NSH food bursary is awarded to students on the basis of financial need, academic excellence, and a commitment to serve the community. The UFS has helped over 650 students since 2011, when Prof Jonathan Jansen, Vice-Chancellor and Rector, started NSH.

These students are true beacons of inspiration and determination. Indeed, they have triumphed in the face of adversity. This is what can be said about their determination and will to succeed.

Glory, a previous recipient of the NSH bursary and a mother of two, graduated on Tuesday morning, receiving a BEd degree (intermediate phase). She stated that the NSH bursary changed her life drastically when she started receiving it.

“I used to constantly worry about my children and what they would eat. So I would sacrifice my own meals throughout the day just to make sure they have food to eat,” says Glory.

“The NSH bursary really gave me peace of mind, my school work was suffering and once I started receiving food each day, I could focus on what really mattered: my degree.”

“My goals for this year are to get a permanent job, and start receiving a stable salary. I am currently working as a temporary teacher at a primary school in Bloemfontein.

Description: Katlego NSH Tags: Katlego NSH

Katlego, one of fourteen NSH bursary recipients during the UFS Autumn Graduations.

“I never would have thought that I could have made it this far. I want to pursue my postgraduate studies, to inspire my children and other students who have been in my shoes. There is help and hope. My faith also gave me refuge. Nothing that is given to me is taken for granted,” says Glory.

Another student Katlego, who graduated on 14 April 2016, receiving her BCom Human Resource Management degree. At present, she is busy with her BCom Industrial Psychology Honours. She heard about the NSH food bursary, through a friend in 2014, and has been immensely grateful for all she has received. 

“There is no shame in asking for help. There can only be hope and relief,” she said.

“I am so thankful for NSH. As part of the bursary programme, we commit to serving the community. We receive but we are also encouraged to give back. The community service projects have helped me to get out of my comfort zone, to look beyond myself and acknowledge that I am also required to give back my time to others who appreciate and cherish it.”   

The NSH students are offered not only a food bursary; they participate in student wellness and development programmes, and they are motivated and exposed to opportunities for personal growth. Students are also encouraged to be involved in university or community projects as a way of ploughing back into the community, thus creating a reciprocal cycle of giving and receiving within their community.

 

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