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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

UFS hosts a successful New Music Indaba
2015-08-18

  

Held at the University of the Free State’s Odeion School of Music (OSM), the NewMusicSA’s New Music Indaba 2015 featured works which Clare Loveday described as “breathtaking, discreet, and perfectly balanced.”

Loveday, one of South Africa’s acclaimed music critics and was Composer-in-Residence for the annual Johannesburg International Mozart Festival, attended the Indaba from 21-26 July 2015. In a review of Saturday’s gala concert, she referred to recitals of this nature as an “essential part of the South African musical landscape, providing musicians and composers a space in which to express their world.”

Staff and students of the OSM were extensively involved in facilitating the festivities as a symbol of commitment to South Africa and international contemporary art music. The OSM Camerata under the baton of Xavier Cloete performed two works by South African composer Hendrik Hofmeyr well as a work by young Argentinian composer Diego Soifer entitled Mille Regretz .The festival featured music theory lectures, a variety of workshops, roundtable discussions ,concerts as well as an outreach programme.

Loveday described the highlight of her Indaba experience as “A delicate construction of sounds and silences that drew the listener into a focused and intense sound world,” a highlight created by the visiting German composer, Charlotte Seither’s “Far From Distance” for piano, clarinet, and cello. The concert evening culminated with Diale Mabitsela's "Friday Nights at Six," adding to the spectacular nature of the festival.

Throughout the week, classical chamber works featuring South African New Music Ensemble (SANME), the Choir of Christ Church Arcadia, and the Odeion Vocal Consort were performed and well-received. Bringing the five-day event to a conclusion was a choral mass at the Bloemfontein Anglican Cathedral, featuring an “Agnus Dei” written by George T. King.
 
Douglas Scott, Curator of the 2015 Indaba, reflected on it as a great success, saying that, “most of the participants agreed the event was a wonderful opportunity simply to hear different voices from the composition community juxtaposed with one another.”

From Scott’s perspective, the principal goal was to foster communication between artists with different visions, and to reach out to the local community.

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