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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

You touch a woman, you strike a rock
2004-11-02

Prof. Engela Pretorius van die Departement Sosiologie in die Fakulteit Geesteswetenskappe by die Universiteit van die Vrystaat het die kwessie omtrent feminisme aangespreek tydens haar intreerede met die onderwerp, You touch a woman, you strike a rock: Feminism(s) and emancipation in South Africa .

Prof. Pretorius het gesê: “Die geskiedenis van feminisme oor die algemeen kan in drie fases verdeel word, waarna verwys word as golwe. Eerste-golf-feminisme (19de eeu) het die fokus geplaas op die beskerming van vroueregte in die openbare terrein, spesifiek die reg om te stem, die reg tot onderrig en die reg om middelklas beroepe en professies te betreë.

Vroeë tweede-golf-feminisme word onthou vir hoe dit moederskap geteoretiseer het as synde ‘n onderdrukkende instelling. Slagspreuke van die 1970s was die persoonlike is polities en susterskap is magtig. Prof. Pretorius sê beide slagspreuke bevestig die idee dat vroue universeel onderdruk en uitgebuit word en slegs deur erkenning van dié situasie kan vroue die strukture wat hul onderdruk verander.

‘n Belangrike aspek van die derde golf van die feminisme-teorie is post-moderne feminisme wat diversiteit en verskille onderstreep. Die poging van hierdie feministe is afgestem op alle vorme van onderdrukking. Vroue van kleur het ook hul ontevredenheid uitgespreek gedurende die derde-golf-feminisme. Die feminisme van vroue van kleur word gekenmerk deur verskeie kwessies en talryke intellektuele standpuntinnames wat neerslaga vind in verskillende terme, soos Afrika feminisme of ‘womanism, sê prof. Pretorius.

Afrika-feminisme dui protes aan teen die wit/westerse geskiedenis en die wit/westerse dominansie binne feminisme. Afrika-vroue het besef dat hul onderdrukking verskillend is van dié van wit vroue en daarom is ‘n ander proses van bevryding nodig. Die Westerse feministiese praktyk om swart vroue by die bestaande feministiese ontologie te voeg, is nie voldoende nie omdat hul unieke ondervindings van slawerny, kolonialisme, onderdrukking deur mans en armoede nie uitgedruk word nie.

‘Womanism’ het tot stand gekom as gevolg van ‘n eksplisiete rassekritiek teen feminisme. Dit is ten gunste van die positiewe uitbeelding van swart mense. Dit word gekenmerk deur kulturele kontekstualisasie, die sentraliteit van die gesin en die belangrikheid daarvan om mans in te sluit.

Die geskiedenis van vroue in Suid-Afrika is verwant aan hul geskiedenis van onderdrukking as gevolg van patriargie. Vroue van verskillende rasse, kulture en klasse het patriargie op verskillende wyses in en variërende mate van erns ervaar. Onder voor-koloniale patriargie het vroue min sê gehad oor huwelikskeuses omdat mans dié besluite gedomineer het.

Die Nederlandse en Britse patriargale erfenis het neerslag gevind in die ideologie van die volksmoeder. Onderwyl dit veral manlike skrywers was wat die beeld van die vrou as versorger en tuisteskepper bevorder het, het vroue self ook hieraan ‘n aandeel gehad, sodat die volksmoeder volwaardig deel geword het van die Afrikaner nasionalistiese mitologie. Alhoewel middel- en werkersklas vroue met dié beeld geïdentifiseer het, het nie alle Afrikaanse vroue die ideologie aanvaar nie.

Onder die Victoriaanse erfenis was Britse vroue beperk to die private eerder as die openbare lewe. Die skeefgetrekte onderrigsisteem wat vroue in huishoudelike loopbane gekanaliseer het, die mag van mans oor hul vroue se eiendom en ‘n tekort aan toegang tot mag en geld het verseker dat vroue by die huis gebly het.

Wit Engelssprekende-vroue het die grootste geleentheid gehad om patriargie uit te daag vanweë hul toegang tot onderwys en die blootstelling aan liberale waardes, sê prof. Pretorius. Liberale vroue soos Helen Joseph en Helen Suzman het ‘n belangrike rol gespeel om in 1930 stemreg vir wit vroue in Suid-Afrika te verseker en het voortgegaan om ‘n rol te speel in die bevryding van swart vroue gedurende die vryheidstryd.

Die feminisme wat onder swart vroue ontwikkel het, was ‘n erkenning van die gemeenskaplike stryd met swart mans om die verwydering van die juk van eksterne onderdrukking en eksploitasie. Swart vroue in aktiewe en onafhanlike politiese rolle het tegelykertyd mans se aannames omtrent hul meerderwaardigheid asook die rassewette van die staat uitgedaag. Daarom kan ons sê dat die feminisme wat hier ontwikkel het, te voorskyn gekom het as gevolg van vroue se betrokkenheid by en toewyding tot nasionale bevryding, sê prof. Pretorius.

Institusionalisering is nie herlei tot magsvoordele nie, want gelykheid is nie in beleidsprogramme geïnkorporeer nie. Die hervestiging van sleutel aktiviste van die vrouebeweging in die regering het die stryd om genderbillikheid verander na ‘n projek wat deur die regering gelei word, sê prof. Pretorius. Ongelukkig word terreine van verandering buite die grense van die regering verwaarloos. Dit kan slegs aangespreek word deur ‘n aktiewe en feministiese stem in die burgerlike samelewing.

“Dit is my oortuiging dat formele instellings vir vroue binne die staat oor die lang termyn slegs effektief kan wees indien daar ‘n effektiewe feministiese vroue-beweging buite die staat in stand gehou word wat die grondslag waarop sosiale beleid gevorm word, kan uitdaag en bevraagteken. Daarom, A luta continua (die stryd duur voort),” sê prof. Pretorius.

Mediaverklaring
Uitgereik deur: Lacea Loader
Mediaverteenwoordiger
Tel: (051) 401-2584
Sel: 083 645 2454
E-pos: loaderl.stg@mail.uovs.ac.za
2 November 2004

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