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12 October 2020 | Story Leonie Bolleurs | Photo Supplied
Adriaan van der Walt
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

#Women’sMonth: Who am I? Questions of identity among Rwandan rape survivors
2017-08-03

 Description: Michelle Nöthling, Questions of identity among Rwandan rape survivors Tags: Michelle Nöthling, Questions of identity among Rwandan rape survivors 

Michelle Nöthling, master’s degree student
in the Centre for Trauma, Forgiveness, and
Reconciliation Studies at the UFS.
Photo: Eugene Seegers

From 7 April to 15 July 1994, a mass genocide swept through Rwanda after years of Belgian colonial rule that divided the country along ethnic lines. Rape was also used as part of a political strategy to torture and humiliate mainly Tutsi women, and as a means of spreading HIV.

Individual focus
Why is it important to listen to what these rape survivors have to say? Michelle Nöthling, a master’s student in the UFS Centre for Trauma, Forgiveness, and Reconciliation Studies, responds, “We speak of groups – refugees, foreigners, and the like – yet we tend to forget the individuals and the lasting impact trauma has had on each person.”

Narrative exploration
Michelle maintains that we are the product of the narratives around us; things like – how to be a woman, how to dress, speak, or treat others. Her research delves into how these rape survivors see themselves, how they narrate their lives. She also investigates power relations based on gender; for example, how language can be used as a divisive tool.

Rwandan backdrop
In Rwanda, gender roles are deeply entrenched. Traditionally, a ‘girl’ remains such while she is a virgin. Her transition into womanhood is usually marked by marriage and followed by motherhood. But rape disrupts this structure, leading to an identity crisis as these girls are catapulted into motherhood with an unplanned child resulting from a traumatic event.

“We are the product of
the narratives around us.”

Reaching their mid-teens, the children, too, started asking questions about identity or paternity. For those mothers who were finally able to open up to their children, the experience has been mostly liberating – often leading to a closer relationship between parent and child. Michelle intends to interrogate how such significant moments shape the way these women perceive themselves. Research tends to portray these survivors solely as mothers of rape-born children. Michelle, however, seeks to examine their identities more deeply.

“These survivors still bear the heavy burden of being marginalised, stigmatised, and severely humiliated. Despite this, they have developed their own communities of belonging; people with whom they connect, to whom they relate, and to whom they are not ashamed to tell their experiences,” she said.

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