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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

Significant support for Student Safety March in Bloemfontein

2017-07-28

SK Luwaca, UFS SRC President; Thapelo Ngozo,
CUT SRC President, and Prof Francis Petersen,
UFS Rector and Vice-Chancellor, during the handover of the
memorandum at the Bram Fischer Building.
Photo: Johan Roux

The University of the Free State (UFS) and the Central University of Technology (CUT) united in a Student Safety Awareness March, which took place on Thursday 27 July 2017 from the UFS Bloemfontein Campus to the Bram Fischer Building.

The peaceful march had a turnout of approximately 1 500 students and staff from both institutions, led by the Student Representative Councils (SRC) from UFS and CUT. The purpose of the march was to hand over a memorandum to the Provincial Commissioner, Lieutenant General Lebeoana Tsumane, who acknowledged it on behalf of Mr Sam Mashinini, MEC for Police, Roads, and Transport in the Free State. The memorandum includes students’ demands regarding safety around student residential areas and general student safety in the city.

Prof Francis Petersen, UFS Rector and Vice-Chancellor, who – together with other members of the senior leadership group – was part of the march, says he is very impressed with the outcome of the march and the participation rate of both staff and students, as well as the joint efforts between the UFS and CUT to arrange the march.

Prof Petersen says, “There are public spaces where our students feel unsafe, and we would like the city and the province to seriously look into that and work with us to try and see if we could make those spaces safe.

A week filled with safety activities
The march was part of the Safety Week taking place from 24 to 28 July 2017, during which the UFS SRC, together with other stakeholders, took part in several activities on and off the Bloemfontein Campus. These included door-to-door visits to student homes and residences on and around campus, awareness campaigns at all the gates of the campus, and a Safety Dialogue held on 26 July 2017 at the Equitas Auditorium on campus.

The aim of the Safety Week was to focus on informing, educating, and encouraging students as well as the Mangaung community at large, to work together in creating a safe environment for students. The week started with the roll-out of an awareness campaign titled Reach Out, which was set to bring students and the community of Mangaung together to help decrease the number of violent crimes faced by students off campus. The communication plan included safety messages, using outdoor billboards, posters on lampposts around the residential student areas, local community radio stations, campus media, and the university’s social media platforms.

UFS and CUT students and staff, occupying the streets of
Bloemfontein during the Safety March.
Photo: Johan Roux

Accreditation of off-campus accommodation service providers
Over and above the Safety Week and safety awareness march, the university has initiated a number of other projects as part of its student safety strategy. This includes a process to accredit off-campus accommodation service providers in Bloemfontein who provide accommodation to students. The decision to accredit these service providers comes from a concern by the university management about the safety of students and the conditions under which some of our students live in off-campus accommodation. The accreditation process entails a list of primary requirements, drafted with the cognisance of the Mangaung Metropolitan Municipality and the SRC, in terms of off-campus accommodation to which private providers must adhere in order to be accredited by the university. The requirements are in line with the Policy on the Minimum Norms and Standards for Student Housing at Public Universities (Government Gazette 39238, dated 29 September 2015).

Transport to and from campus
Another project to be initiated on 31 July 2017 is a transport pilot project with Interstate Bus Lines to assist students with transport and access to the Bloemfontein Campus. The route includes various stops in the areas surrounding the campus, as well as a hop-on/hop-off route within the campus.

Released by:
Lacea Loader (Director: Communication and Brand Management)
Telephone: +27 51 401 2584 | +27 83 645 2454
Email: news@ufs.ac.za | loaderl@ufs.ac.za
Fax: +27 51 444 6393

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