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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 mourns the death of valued Member of Council
2015-05-15

Father Patrick Towe

The senior leadership of the University of the Free State (UFS) is deeply saddened by the passing away of Father Patrick Towe on Wednesday 6 May 2015, following a period of illness. Father Towe served as Chairperson of the university’s Campus Ministries Forum (CMF) for several years, and had been its representative on the UFS Council since 2006.

“Father Towe was an extremely valuable member of the UFS Council. His insight into and knowledge of university business always contributed greatly to the spirit in which the deliberations of Council took place. He will be dearly missed. Our deepest condolences go to his family, friends, the students of ACTS, as well as the congregation in Heidedal, which he served,” said Judge Ian van der Merwe, Chairperson of the UFS Council.

“I remember Father Towe fondly for his pastoral availability to staff and students during moments of crisis from the time of the Reitz incident to those times in which we lost precious student lives. He would call us to prayer and consolation, and for these gifts from Father Towe I am deeply, deeply grateful,” said Prof Jonathan Jansen, Vice-Chancellor and Rector of the UFS.

Father Towe, OMI (Missionary Oblates of Mary Immaculate) represented the Association of Catholic Tertiary Students (ACTS) on the Campus Ministries Forum. As Student Chaplain, he served the university student body through the Catholic Christian Ministry, providing spiritual guidance and support. He took up campus ministry in Bloemfontein in November 2002, and developed a quasi-parish within the student communities on campus.

He received his education in the United Kingdom where he was ordained in 1975. Throughout his career, Father Towe had a special involvement with community development and youth work. He worked as the Roman Catholic Chaplain at the University of Southampton from 1996 to 1998, providing pastoral care to both students and staff of the university. He served as Parish Priest of Christ the King in Heidedal, Bloemfontein.

“Father Towe was instrumental in reviving the CMF, and getting many more churches on campus involved. He had a heart for seeing churches with different backgrounds and focuses unite in making a difference at the university. He was a true gentleman, and was willing to listen to and negotiate with people, without compromising his values. He also did great work among the people of Heidedal towards the end of his life, and we will miss his presence on the CMF”, said Pastor Alistair Kingwill, current Chairperson of the CMF.

 

Media Release
Lacea Loader
Director: Communication and Brand Management
Tel: +27(0)51 401 2584
E-mail: news@ufs.ac.za

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