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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

School of Medicine – heartbeat of the UFS

2015-06-24

Photo: Charl Devenish

During the past year, the School of Medicine at the University of the Free State celebrated several successes in the field of research and cooperation agreements. These successes allow the school to continue delivering world-class teaching to some of the country’s top students.

Earlier this year, a research team from the Department of Medical Microbiology under the guidance of Prof Felicity Burt, received a grant of R500 000 to conduct research on Congo fever (CCHF). Prof Burt is an internationally-recognised expert on Congo fever. The funding that has been awarded will be used to profile immune responses against CCHF viral proteins, and investigate mechanisms and strategies to enhance these immune responses. This study may contribute to the development of a vaccine against this deadly virus.

Prof Stephen Brown from the Department of Paediatrics and Child Health’s expertise and commitment to paediatric cardiology gained him the title of Bloemfonteiner of the Year. Under the leadership of Prof Brown, the department has performed many breakthrough operations and procedures. The most recent of these, was the first hybrid procedure in the country which was performed in November 2014. The department also has an ultramodern hybrid heart catheterisation suite.

Prof William Rae from the Department of Medical Physics focuses on medically-applied radiation. Together with his department, they are looking at quantitative radiation dosages. The research is particularly crucial for the successful treatment of cancers. Through this research, it is possible to ensure that patients receive the appropriate radiation dosages in order to obtain the desired effect without the patient being affected negatively.

Dr Nathanial Mofolo, Head of the Department of Family Medicine in the School of Medicine, is since 2006 involved at various levels of hospital management regarding quality assurance, patient safety, clinical and infection management, as well as administration. He is currently curator of internal medical students for four of the UFS’s teaching hospitals. His department is currently focusing on the National Health Plan, HIV and tuberculosis, teaching and learning, as well as service delivery in family medicine.

Prof Francis Smit manages the team that, to their knowledge, decellularised the first primate heart. The method has been applied successfully on rat and pig hearts by researchers in America. Recently the team also successfully cultivated beating heart cells ? those of a rat ? in their laboratories. The research is in line with what researchers in Europe and America are working on. In the long run, the research project aims to attempt ‘building’ a heart that could be used for the purposes of organ donation.

The UFS is also home to the only metabolic research unit in the country. The unit was established to focus research on obesity, type II diabetes, metabolic bone diseases and all related diseases. This includes diseases such as diabetes, cholesterol, cancer, psoriasis, lymphoedema, fatigue, high blood pressure, gout, arthritis, fibrosis, skin disorders, PMT, migraine, insomnia, gall and kidney stones and related infections, and obstructive sleep apnea. The unit is a joint initiative between the UFS and Christo Strydom Nutrition. Mr Christo Strydom, a nutritionist and world renowned in the treatment of lymphoedema, invested R5 million in the establishment of this unit at the UFS. Christo Strydom is also the founder and owner of Christo Strydom Nutrition.

The School of Medicine at the University of the Free State is the only unit on the continent offering in-depth modules in clinical simulation. The Clinical Simulation Unit on the Bloemfontein Campus of the UFS, headed by Dr Mathys Labuschagne, is regarded as the flagship unit of the school and boasts high-technology equipment where students can practice their clinical skills before applying those skills in the real world.

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