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03 November 2022 | Story Leonie Bolleurs | Photo Supplied
Dr Liezel Rudolph
Dr Liezel Rudolph, a lecturer in the Department of Geography, recently returned from an expedition to Gough Island in the South Atlantic Ocean, where she was involved in research that aims to better understand the landscape evolution of some subantarctic islands and their response to long-term climate change.

A study of subantarctic islands tells us that, in general, the Southern Hemisphere is experiencing a rise in temperature, with an increase in rainfall in some locations, and other areas becoming drier. The annual temperature and rainfall average remain the same in some places, but there is a change in seasonality and synoptic weather events.

This is according to Dr Liezel Rudolph, a lecturer in the Department of Geography at the University of the Free State (UFS). She recently returned from an expedition to Gough Island in the South Atlantic Ocean, supported by the South African National Department of Forestry, Fisheries and the Environment, the National Research Foundation, and the Royal Society for the Protection of Birds.

This teacher of modules on Process Geomorphology and fieldwork techniques at the UFS, says the objective of her work on the island was to do a geomorphological survey of the island and explore the suitability of geochronological dating techniques on the island’s substrate. 

She explains that with geochronological methods one can determine the age of rock material as well as the rate of landscape change on the island. “In other words, dating when the volcano was formed and determining how long it takes for weathering to break down the rock material, and erosional processes to remove soil material.”
 
The research she is involved in, forms part of a SANAP-NRF-funded project, Sub-Antarctic Landscape Climate Interactions, which aims to better understand the landscape evolution of some subantarctic Islands and their response to long-term climate change. 

Studying the past to understand the present

According to her, studying landscape change enables one to better understand climate change over a long period of time. 

She states that the more regions are investigated, the clearer the picture of climate change will become. “The Earth is a large, complex system. By studying climate change in one location, one cannot simply assume that the same type and rate of change is occurring everywhere else. It would be like imaging a 1 000-piece puzzle by building with 10 pieces. The Southern Hemisphere is predominantly ocean, which makes it difficult to pin down land-atmosphere interactions – but the subantarctic islands give us the opportunity to create data points for the Southern Hemisphere, which would otherwise be a very large missing piece of the puzzle,” explains Dr Rudolph.

She says the interaction between ocean, atmosphere, and land remains complex and it is important to study the entire picture in order to fully understand how this is happening. Especially since the climate is changing at a drastic rate.

Dr Rudolph, whose research at the UFS is focused on constraining the last glaciation of subantarctic Marion Island though various proxies and dating techniques, says the subantarctic islands are very sensitive to changes in climate. 

A clearer picture of climate change

She was part of previous expeditions to the island. Although all these expeditions had different goals, according to her, they all aimed to answer the same questions, which are how the island’s landscape has developed throughout history and what the climatic drivers were during its evolution. 

“The landscape responds to changes in temperature and precipitation. Under colder, wetter conditions – when the island’s surface is subject to a freeze-thaw process – a range of peri-glacial landforms will develop. These landforms will still be evident in the landscape years later under a different climate, for example, warmer or drier conditions. We can study these landforms in real-time and establish whether they are actively forming or are relict features that formed under different climatic environments,” remarks Dr Rudolph.

The research, which is taking place in collaboration with the British Antarctic Survey, is co-led by Prof Werner Nel from the University of Fort Hare, and Prof David Hedding from the University of South Africa. 

• Dr Rudolph is grateful to the Government of Tristan da Cunha, which is responsible for managing the conservation of Gough Island, for permitting them to do scientific work on the island. 

News Archive

UFS responds to revocation of the accreditation of the SA Doping Control Laboratory by WADA
2017-07-01

The World Anti-Doping Agency (WADA) yesterday informed the South African Doping Control Laboratory (SADoCoL) at the University of the Free State (UFS) that the WADA accreditation status of the laboratory has been revoked.

This revocation does, however, not include the analysis of blood samples for the Athlete Biological Passport for which SADoCoL has been re-accredited in August 2016 and which the laboratory will continue to perform. It also does not impact at all on the testing of urine sport samples by the South African Institute of Drug-free Sport (SAIDS), who will continue to send such samples for testing to other WADA accredited laboratories, while blood samples will be tested at SADoCoL as before.

The revocation follows a year long period of suspension in which the laboratory had to develop its analytical capabilities and instate new systems and methodologies.  “In this period the laboratory worked diligently to realize all of these requirements and according to an inspection team from the WADA Laboratory Expert Group who visited the laboratory in February 2017, much has been done and the Laboratory is in a much better state than it was before the suspension in May 2016,” says prof Marthinus van der Merwe, Director of SADoCoL.

“However, there were certain aspects of these requirements that the laboratory could not achieve within the time-frame stipulated by WADA and therefore the organisation is bound by its rules and regulations to now revoke the accreditation status of the laboratory. Since much effort and resources have been invested in the laboratory in the last two years, the management of SADoCoL together with senior leadership of the UFS decided to go ahead and finalise all development in order to re-apply for WADA accreditation,” says prof van der Merwe. 

“The UFS fully acknowledges the hard work of SADoCoL during the period of development and is committed to support the laboratory in its endeavors to re-attain its status within the very specialised and highly regulated community of world-wide doping control laboratories.  The premium goal of the laboratory is still to fully serve the sporting community of South Africa and Africa according to the WADA guidelines for anti-doping control in Sport and it is confident to attain that with the support of all role players in this field,” says Prof Witthuhn, Vice-Rector: Research at the UFS.

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