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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

Parking at UFS for visitors

2007-11-10

UFS creates more parking for visitors

In its effort to make it easier for visitors to park on the Main Campus of the University of the Free State (UFS) in Bloemfontein, two paid parking areas will be put into operation as from Monday, 5 November 2007.

These parking areas are part of a comprehensive new parking strategy of the UFS, which is being implemented since September 2007. As part of the strategy, areas of the central campus have been reserved for staff and visitors and hundreds of new parking areas were developed for students at the entrance in Wynand Mouton Avenue (at the Faculty of Health Sciences) and the entrance in DF Malherbe Avenue (at the Agriculture Building).

“The paid parking areas for visitors, which are as close as possible to the busy and largely closed-off central campus, were created as an additional service to visitors,” said Ms Edma Pelzer, Director of Physical Resources at the UFS.

According to Ms Pelzer, persons who attend meetings, seminars or short courses, visiting colleagues, consultants, service providers, family of students and staff members, clients, etc. can make use of this parking.

“We have found that it is often difficult for visitors to obtain parking in or close to the central campus. Now they will have a choice to either park in the visitors parking areas at a minimal fee or to park in any of the open unreserved parking areas on campus,” said Ms Pelzer.

The areas, which will be closed off behind booms on weekdays from 06:00 until 18:00, are situated to the eastern side of the “Red Square”, east of the CR Swart and Idalia Loots Buildings and west of Campus Avenue North between the Psychology and the Flippie Groenewoud Buildings.

Media Release
Issued by: Lacea Loader
Assistant Director: Media Liaison
Tel: 051 401 2584
Cell: 083 645 2454
E-mail: loaderl.stg@ufs.ac.za
2 November 2007

Parking for visitors: Important notice:

As from Monday 5 November 2007 two paid parking areas on the UFS Campus will be put into operation. The areas will be closed off behind booms on weekdays from 06:00 until 18:00. These will be manned and R3 per hour will be charged.

The following areas are involved:

P3: The area to the east of the “Red Square”, east of the CR Swart and Idalia Loots Buildings.
P6: The area to the east of Campus Avenue North between the Psychology and Flippie Groenewoud Buildings.

The friendly co-operation of users of motor vehicles on campus is requested to allow this implementation to proceed as smoothly as possible.

Parking for visitors: More information

The strategy to create paid parking areas for visitors

The decision to reserve areas in the central campus areas for the convenience of visitors was taken as part of the comprehensive new parking strategy of the UFS approved by the Executive Management in May 2007 and which is being implemented since September.

All visitors need not park in these areas. Visitors may park for free on any open (unreserved) parking bay on campus. These paid parking areas for visitors, as close as possible to the busy and largely closed-off central campus, have been created as an additional service to visitors.

The strategy to close off parts of the central campus for staff members and visitors was implemented after sufficient alternative parking areas had been developed for students.

What is meant by the term “visitors”?

It includes all persons who are not students of staff members of the UFS and who visit the campus for one reason or another. Persons who attend meetings, seminars or short courses, visiting colleagues, consultants, service providers, family of students and staff members, et cetera are included.

As at present, it will, of course, be possible to make special arrangements with Protection Services to make it possible for VIP visitors to park as near as possible to their destinations.

No student or staff member will be actively prevented from parking in the area. They will, however, be discouraged by the fact that R3 per hour will be charged without exception.

The visitors’ parking area and access to it

P3: The area to the east of the “Red Square”, east of the CR Swart and Idalia Loots Buildings. The area is within easy walking distance for visitors to, among others, the following buildings: George du Toit Administration Building, Theology Building, Idalia Loots Building, CR Swart Building, Johannes Brill Building, Van der Merwe Scholz Hall.

The area is conveniently accessible from the following entrances: Nelson Mandela Drive, Groenewoud Street and Wynand Mouton Drive.
P6: The area to the west of Campus Avenue North, between the Psychology and Flippie Groenewoud Buildings. The area is within easy walking distance for visitors to all the academic buildings in the central campus, such as the Chemistry Building, Stef Coetzee Building, the Geography Building, et cetera and located directly opposite the general information point on the Thakaneng Bridge.

The area is conveniently accessible from the following entrances: Fürstenburg Road and DF Malherbe Avenue (at the Agriculture Building).

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