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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

SRC elections of our Bloemfontein Campus

2011-07-26

The Student Council elections of our university at the Bloemfontein Campus will take place on 29 and 30 August 2011. These official election dates were announced by Mr Rudi Buys, Dean: Student Affairs, on 25 July 2011.

Nominations open on Wednesday, 27 July 2011 and the elections, which are constituted according to the SRC Constitution, shall be handled by the Independent Electoral Agency, which shall be instituted by the SRC Constitution with this in view.

“The elections introduce a new era in student leadership and governance, because student representation will now constituted in such a way that affords the majority of students the opportunity to vote directly for their representatives. Senior leadership structures are extended in the new Constitution, in order to allow more students to hold senior positions,” states Mr Buys.

The SRC elections follow on the approval of a new Constitution that was accepted by our Council on 3 June 2011.

The Constitution was drafted over a period of eight months by the Broad Student Transformation Forum (BSTF), consisting of students, in order to design a new dispensation in student structures. The BSTF, which decided on new models of student representation in collaboration with independent facilitators, consists of more than 70 student organisations and residences. The changes to the Constitution were decided on and accepted by the BSTF, after recommendations from four student study groups, which investigated student leadership and governance in depth, at national as well as international level, were taken into account. The study groups visited nine (9) other SA universities, as well as investigated student representation at internationally renowned universities like Cornell, Yale and Stanford in the United States of America.

Ms Modieyi Motholo, Chairperson of the Interim Student Committee, says that she is very proud of what the students have achieved with the new Constitution. “I wish to accord recognition to all the students who lead the process for all their hard work. Constitutional revision is a strenuous process and it is nothing short of a miracle that the students could not only reconstruct the Constitution, but also have it accepted in less than a year.”

The important changes include, amongst others:

Candidates no longer stand on behalf of parties in the elections, but as independent candidates for 10 predetermined portfolios for which students can vote directly;
Students also directly vote for a President and a Vice-President;
Nine (9) SRC members serve ex-officio as SRC members by virtue of being chairpersons of nine additional student councils established by the Constitution. Amongst others, the councils include a postgraduate student council, an international student council, a student media council and a student academic affairs council;
More stringent eligibility requirements are set for candidates, namely that students who wish to run in the elections has to, amongst others, sustain an academic average of more than 60%, and hold proven student leadership experience (which could be verified by the Independent Electoral Agency).

“With the SRC elections, students have the opportunity to firmly entrench the changes in student governance on which they have decided on by themselves firmly, as a sustainable model for democracy at our Bloemfontein Campus. It speaks volumes that the number of leadership positions for which candidates can make themselves available, in essence has been increased by the number of additional student sub-councils from 21 to 67, because it brings about much more direct representation for different students across the campus,” says Mr Buys.

“I firmly believe that the upcoming student council elections will be a success,” says Motholo. “I wish the students, who are prepared to sacrifice a year of their lives in service of the student community as a member of the SRC, all of the best.”

The Qwaqwa Campus’ election schedule shall be announced within the next week, as well as the date of the institution of the Central Student Council (CSC).

Media Release
26 July 2011
Issued by: Lacea Loader
Director: Strategic Communication
Tel: 051 401 2584
Cell: 083 645 2454
E-mail: news@ufs.ac.za

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