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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

Graduates convene with global leaders at the UFS 2015 Winter Graduation ceremonies
2015-07-07

Dr Hendrik Auret, dr Gerhard Bosman en dr Madelein Stoffberg.
Foto: Leonie Bolleurs

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The University of the Free State’s 2015 Winter Graduations, which took place from 1-2 July 2015 on the Bloemfontein Campus offered several highlights. Three global leaders received honorary doctorates. A further 2 000 degrees and diplomas were conferred to graduates in the seven faculties of the university.

For the first time in the history of the UFS, three PhDs in Architecture were awarded simultaneously. Hendrik Auret, Gerhard Bosman, and Madelein Stoffberg’s outstanding achievements are a milestone in the university’s pursuit of academic excellence.

Furthermore, three PhDs were conferred on graduates from the Department of Consumer Science in the Faculty of Natural and Agricultural Sciences. Ismari van der Merwe, Natasha Cronje, and Gloria Seiphetlheng set a precedent when they walked across the Callie Human stage to collect their doctorates at the same graduation ceremony.

This year, the university produced 66 Doctors of Philosophy in various fields of study. Six of these PhDs were awarded in the Department of Physics. Three graduates in the Department of Soil- and Crop- and Climate Sciences received PhDs at the Winter Graduation. They are Tesha Mardamootoo, Elmarie Kotzé, and David Chemei.

Dr John Samuel.
Photo: Johan Roux

Keynote speakers provide enlightenment to graduates

On Wednesday 1 July 2015, Dr John Samuel, SA’s leading education expert, addressed 707 diploma graduates from the Centre for Financial Planning Law and the School of Open Learning. For the graduates’ future reference, Samuel offered invaluable knowledge he had accumulated over the years as Chief Executive of the Nelson Mandela Foundation. “One of the lessons I have learnt was not only the importance of time, but it was in fact what being on time demonstrated,” he said. “Being on time was demonstrating respect, respect for the people you are meeting, and for the occasion.”

On the second day of graduation, Nataniël, South African singer, songwriter, and entertainer spoke to Master’s and doctoral graduates in the Faculties of Economic and Management Sciences, Humanities, Education, Health Sciences, Law, Theology, and Natural and Agricultural Sciences. His keynote spoke to the graduates’ sense of resolve in saying, “nothing is ever accidental. It is always with a purpose, it is your turn to make the world a better place.” He added that “it is important to strive for excellence and to be proud of what you are doing.”

Honorary doctorate recipients in a nutshell

Dr Samuel is one of the three exceptional global leaders to receive honorary doctorates from the university on 1 July 2015. His accolade was presented by the Faculty of Education. He has contributed to the Public Participation Education Network (PPEN) campaign as a founding member. He established the Centre for Education Policy Development, the Joint Working Group (for The National Party Government and the ANC), the National Education Conference, and the National Education and Training Forum. In addition, he made leadership contributions to the First Education and Training White Paper, the first Green Paper on Higher Education, and is the CEO of the Oprah Winfrey Leadership Academy for Girls. The WK Kellogg Foundation in the USA operates under his directorship.

Professor Heidi Hudson, Director of the Centre for Africa Studies at the UFS and Dr Lakhdar Brahimi.
Photo: Mike Rose from Mike Rose Photography

Dr Lakhdar Brahimi received an honorary doctorate from the Centre for Africa Studies. Algerian-born Brahimi was first involved with the United Nations (UN) in 1992, and has since been deployed all over the world on peacekeeping missions. Amongst many other countries, he has worked as a mediator for South Africa, Haiti, Afghanistan, Iraq, Syria, Democratic Republic of Congo, Cameroon, Burundi, Angola, Liberia, Nigeria, Sudan, and Côte d’Ivoire on behalf of the UN. He also played a direct role in South Africa’s democratic transition as a special representative in 1993/4.

Dr Mercy Amba Oduyoye received an honorary doctorate from the Faculty of Theology. Dr Oduyoye is widely regarded as one of the most influential women theologians in Africa. She was the first black woman to receive a degree in Theology in 1965 from Cambridge University in the United Kingdom. She continues to shift the paradigm of gender in theology internationally as the director of the Institute of African Women in Religion and Culture at the Trinity Theology Seminary in Ghana.

Dr Mercy Oduyoye.
Photo: Johan Roux

In closing the academic celebrations

Vice Rector: Academic, Dr Lis Lange, commended the class of 2014 for making their contribution to the educational system. Prof Jonathan Jansen, Vice Chancellor and Rector, also congratulated the graduates in closing.

“This is a day many have worked very hard towards, it is an enormous achievement as well as a development in the quality of research, and the courage to research,” he said in a vote of confidence.

Dr Khotso Mokhele, Chancellor of the UFS, applauded the university in light of the increased number of female graduates who completed their degrees with distinctions. The transcendence of demographics, both in terms of gender and race, on a postgraduate level, increases the hope of achieving gender equality in both the academic arena and South Africa.

More graduation news

A number of distinctions were also awarded during the two-day ceremony. For a list of these distinctions, follow this link.

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