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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 satisfied with proceedings of EFF National People’s Assembly

2014-12-17

The University of the Free State (UFS) is happy about another successful hosting of a political party; this time, the Economic Freedom Fighters (EFF). In the recent past (December 2012), the UFS hosted the African National Congress (ANC) with the same energy, support and selfless commitment as with the EFF.

“The fact that the EFF paid the required amount for the use of the university’s venues in full before the congress commenced, bears testimony to this. For the past two months, the UFS’s working team worked closely with the EFF’s logistics team to thoroughly plan for a smooth and successful National People’s Assembly,” says Dr Choice Makhetha, Acting Rector of the UFS.

The hard work and commitment invested in the preparation process paid off. The 1st EFF National People’s Assembly, held 13-16 December 2014 on the Bloemfontein Campus, was a huge success.

“It is with great excitement that I can report that all premises of the UFS have been left the way they were found on arrival; no damage to any property and no littering.”

“Thank you to the UFS staff members who worked selflessly on a daily basis: the cleaning staff who started very early in the morning and went home very late at night; garden staff who made sure that the grounds were exceptionally clean every day and the flowers bright; student volunteers who worked shifts of over 24 hours on the first day, making sure that EFF delegates were checked into residences; staff members at the Visitors Centre who were ready to share information about the university and provide support to EFF delegates; staff members at the Odeion (which served as media centre) who ensured that the national and international media houses were comfortable and that the media conferences ran smoothly; safety and security personnel who provided protection for all the people on campus and also ensuring safety of the buildings; the health and safety officers supported by our partners from ER24 emergency services; and the South African Police Services (SAPS). To the electricians, the plumbers and other colleagues from Physical Resources who assisted with any task, even beyond the call of duty, we say thank you. For all the support and extra miles travelled – we appreciate your passion for the work you do; you are all very important to us at the UFS.”

“As the University of the Free State, we would like to express our gratitude to the leadership of the EFF, the delegates, guests and partners, as well as the media houses. The level of discipline among delegates was impressive. The UFS staff members appreciate the level of professionalism and respect shown by the EFF leadership and delegates. All the best for the future!,” says Dr Makhetha.

The UFS will continue to host political parties, interest groups, associations and more in their diversity, provided there is availability of venues, events are held outside the academic period and payment is received well ahead of hosting. As a public institution of higher learning, the university has a responsibility to promote democracy and help deepen the principles thereof. A university is a perfect platform for differing views and diverse political formations to find expression.

“To the UFS community, thank you for the trust you showed in the working team as it prepared to host the EFF’s 1st National People’s Assembly. To Mangaung Metropolitan Municipality and the Free State Province – we appreciate the support. As the University of the Free State, we know we can always count on you!”, says Dr Makhetha.

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