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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

UFS takes 70 first-year students to the USA

2010-08-20

Mr Rudi Buys (middle, with tie) with some of the students selected for the F1 Programme
Photo: Gerhard Louw

The University of the Free State (UFS) has announced the names of the first ever group of 70 first-year students that will travel to the United States of America (USA) as part of the university’s Student Leadership Development Programme.

This group of students will spend two weeks at universities in the USA to experience student life and learn about leadership and diversity at these universities.

“This is a first for not only the UFS, but also for South Africa and we are incredibly proud. The programme is unique to any other student leadership development programme in the country. We are leading the way and are taking students to live and learn amongst students at various universities across the USA,” said Mr Rudi Buys, Dean of Student Affairs at the UFS.

The programme was one of the goals of Prof. Jonathan Jansen, Rector and Vice-Chancellor of the UFS, which he aimed to realise when he was appointed by the UFS in 2009.

“With the programme we want to develop participants’ thinking and capacity to lead in the contexts of diversity and change and we hope to direct them to programmes leading change in student life in general upon their return,” Mr Buys said.

The 70 students will leave for the USA on 22 September 2010. After spending some time there and learning more about their American peers’ lives and culture, they will return to the UFS on 7 October 2010.

“We took great care in selecting the 70 participants. They are representative of all our students, as well as students from our Qwaqwa Campus,” said Mr Buys.

A rigorous selection process was followed, which focused on the students’ academic excellence, their participation in student- and residence-life programmes and their interest in growing in the areas of, amongst others, leadership, diversity and citizenship. Each candidate had to undergo a pre-selection process, followed by a panel interview consisting of staff from various faculties and divisions at the UFS.

The students will stay in groups of about ten at the various universities, which include universities such as Cornell University, New York University, the University of Massachusetts, the Appalachian State University and Virginia Polytechnic University. “These universities will provide our students with accommodation and will present various academic and cultural programmes which our students will participate in and learn from,” said Mr Buys.

“We have also put a programme in place to prepare our students thoroughly for the trip. Because some of them have never travelled on an aeroplane, let alone travelled to a foreign country, we have made arrangements with the Department of Home Affairs for assistance with travel documentation, as well as special arrangements with the USA Embassy for assistance with visas. They will also be attending workshops focusing on, amongst others, research, leadership and diversity before their departure on 22 September 2010.

“Upon their arrival in the USA the group of students will firstly be taken to Washington DC where they will be briefed about American customs, etc. From there they will be placed at the various universities,” said Mr Buys.

Upon their return the students must be involved in student-life programmes on campus, establish volunteer programmes and initiate and establish mentoring programmes for their fellow students. “We want them to give back what they have learnt and experienced,” said Mr Buys.

“We are planning on implementing the Student Leadership Development Programme as an annual programme and are looking forward to this incredible programme through which this group of first-year students will have the opportunity of a lifetime to be true ambassadors of South Africa and, in particular, the UFS, as they leave for the USA,” he said.

Media Release:
Mangaliso Radebe
Assistant Director: Media Liaison
Tel: 051 401 2828
Cell: 078 460 3320
E-mail: radebemt@ufs.ac.za
20 August 2010

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