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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

Outstanding alumni celebrated at the Chancellor’s Distinguished Alumni Awards

2017-08-28

Description: Outstanding alumni celebrated at the Chancellor’s Distinguished Alumni Awards Tags: Outstanding alumni celebrated at the Chancellor’s Distinguished Alumni Awards

From the left: Former Miss World and UFS Medical student, Rolene Strauss; Rector and Vice-Chancellor,
Prof Francis Petersen; The Chancellor’s Distinguished Alumnus of the Year,
Vian Chinner; and Chancellor of the UFS, Dr Khotso Mokhele. Photo: Charl Devenish

Alumni Awards Photo Gallery

Alumni are the heart and soul of a university, a legacy that lives on for generations, bringing pride to the alma mater. Each year, the University of the Free State (UFS) through the Chancellor’s Distinguished Alumni Awards, celebrates its outstanding alumni, who have stood out among their peers, making waves in their careers, at home and abroad. The UFS Chancellor, Dr Khotso Mokhele, said the university plays a pivotal role in ensuring that students enjoy a life-long relationship with their alma mater. He encouraged the UFS management to create opportunities to engage students during their years of study, in order to create this mutually-beneficial relationship into the future.

The Chancellor’s Distinguished Alumnus of the Year Award, the highest honour accorded to an alumnus, recognises the distinguished national or international achievements of its recipient. The award was presented to Vian Chinner, chief executive officer at Xineoh, a performance marketing company he founded in 2014. The company, based in Bloemfontein, with offices in Cape Town, Oregon in the US, and Vancouver in Canada, specialises in applying mathematical modelling and machine learning to optimise conversion in industries including real estate, mortgage banking and e-commerce. It has generated more than $30 million in revenue for its clients.

The Young Alumnus of the Year Award acknowledges the achievements of alumni who graduated within the past decade and was presented to Leah Molatseli, founder and managing director of Lenoma Legal, who graduated with an LLB at UFS in 2010.

The Cum Laude Award is bestowed upon an alumnus in recognition of excellence in any field, whether vocational or voluntary. The awards in this category were presented to three alumni:

David Abbey, Acquisition and Leveraged Finance Deal Maker at Rand Merchant Bank. David graduated with a BCom Accounting (RU) 2007 and a BCom Hons Accounting (UFS) in 2008.

Johan Eksteen, Agricon Pelleting, graduated with an MSc in Sustainable Agriculture in 1998, and received an MBA in 2005, both at the UFS.

Zola Valashiya, Co-founder and director: Debate Afrika and Schools Projects and Campaigns Manager at Corruption Watch. He graduated with an LLB (UFS) in 2014, and Masters of Public Administration (Central European University, Hungary) in 2016. He is a Mandela Rhodes Scholar (2015) and a Young African Leadership Initiative Mandela Washington Fellow (2017) and is presently featured on the Mail & Guardian list of top 200 young South Africans.

The Executive Management Award: this service award is presented to an individual who has delivered exceptional service to the UFS and is not limited to alumni of the institution, current students and the community at large. The award was presented to Sarina Cronje, Head of Athletics at KovsieSport.

She graduated with a Bachelor of Science (UFS) in 1977 and a Postgraduate Diploma in Higher Education (UFS) in 1983. She is a mother and career woman, whose family carries the same passion and drive for sports that champions are made of.

The Kovsie Ambassador Award is bestowed upon a current student whose achievements have brought him/her distinction, benefited his/her community, and brought credit to the UFS.

Crystal-Donna Roberts graduated with a BA Drama and Theatre Arts (UFS) in 2005. She is an active television, theatre and film actress who has appeared in a multitude of theatre productions in addition to starring in Afrikaans soap opera “7de Laan, Getroud Met Rugby, Montana” and “Vallei van Sluiers” in which she won public favour. She is currently playing the lead role in the internationally acclaimed film, “Krotoa” which has won numerous awards including Best Film at the Harlem International Film Festival in New York. It also won the Award of Excellence at the International Film Festival for Women: Social Issues and Zero Discrimination, and many more.

Franco Smith, Director: Free State Rugby and Assistant Coach: Springboks. He graduated with a BA Human Movement Sciences (UFS) in 1996 and began his career in rugby in 1999 when he was selected for the Free State Under-18 Craven Week team. He became a regular on the Free State Under-20 and the UFS Shimlas teams prior to his Free State Cheetahs debut in 1992. Franco was reappointed backline coach of the Cheetahs and head coach of the Shimlas in 2015. With many accolades to his name an illustrious career in coaching and management over the years, the name Franco Smith should not be foreign to true rugby connoisseurs.

The Rector and Vice-Chancellor, Prof Francis Petersen, congratulated all the award recipients: “I applaud all alumni; you have made the city of Bloemfontein and the whole province proud.” The National Executive Alumni Chairperson, Dr Pieter du Toit, congratulated the award recipients and thanked the leadership of the university as well as the event organisers.

The awards signify the great esteem with which the UFS holds its alumni and the community that helps to drive its vision, cherish its history and pave the way for more outstanding Kovsies of the future.

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