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Landscape change studies bring better understanding of climate change

03 November 2022 | Story Leonie Bolleurs | Photo Supplied

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

Multidisciplinary conference on TB control

2003-09-22

Theme: Tuberculosis control: a multidisciplinary approach to research, policy and practice Venue: CR Swart Auditorium, University of the Free State Campus, Bloemfontein Date: 11 and 12 November 2003 Time: 11 November, 19:00-20:30 AND 12 November 08:30-17:00

Tuesday, 11 November - 19:00-20:30 (registration from 18:30) and Wednesday, 12 November - 08:30-17:00 (registration from 07:30)

The Honourable MEC for Health in the Free State will officially open the Conference on the evening of 11 November, while Prof Frederick Fourie (Vice-Chancellor and Rector of the University of the Free State) will attend to the welcoming. In addition, Prof Françoise Portaels (Institute of Tropical Medicine, Belgium) and Dr Refiloe Matji (National Department of Health, South Africa) will respectively present a global and a South African perspective on TB. The majority of the presentations will follow on 12 November.

Main thrust of Conference

The main thrust of the Conference is to disseminate both research results and policy/managerial matters relevant to TB and TB control, and to facilitate discourse among researchers and health policy makers/managers/practitioners in the field of TB control. Presenters of papers, as well as delegates are, therefore, drawn from both academic/research institutions, and from health service sectors involved in TB control in all provinces and in neighbouring countries.

Topics of presentations

A variety of topics will be dealt with during presentations, such as: New challenges in the global control of MDR-TB New strategies and policies on MDR-TB in South Africa A South African perspective on TB control A provincial perspective on implementing the national TB control policy

The role of the public district hospital in TB control Tuberculosis control through DOTS Case detection strategies

TB in children Hospital to clinic: is this the missing link? Patient compliance with DOT for TB Challenges for effective health communications in a multicultural context

The economics of TB Frequency of multiple infections with M. tuberculosis in pulmonary TB patients HIV/AIDS and TB, etc.

Speakers

Among the speakers will be Dr Victor Litlhakanyane (Head of Health: Free State); Prof Françoise Portaels and Dr Leen Rigouts (Institute of Tropical Medicine, Belgium); Dr Reliloe Matji (Director: NTBC Programme); Ntsiki Jolingana (Director: HIV, AIDS, TB and Communicable Diseases, Free State) and Annatjie Peters (Free State TB Coordinator); Dr Karin Weyer (Medical Research Council); Profs Herman Meulemans, Diana De Graeve, Luc Pauwels and Christiane Timmerman (University of Anwerp, Belgium); Dr Lara Fairall (UCT Lung Institute, University of Cape Town); Prof Frikkie Booysen (Department of Economics, University of the Free State); Christo Heunis, Ega Janse van Rensburg-Bonthuyzen, Zacheus Matebesi and Kobus Meyer (CHSR&D); Dr Mary Ednington (School of Public Health, Wits); Dr Carmen Báez and Sabine Verkuijl (ISDS); Anneke Van der Spoel-Van Dijk (Medical Microbiology, University of the Free State).

Costs

There will be no registration fees. However, delegates are expected to arrange their own transport and accommodation, or arrange for sponsorships themselves.

Contact details in case of inquiries and confirmation:

Postal Address: The Director, CHSR&D, PO Box 339, University of the Free State, Bloemfontein, 9300 Fax: 051 448 0370 Tel: 051 401 2181 OR 051 401 3256 E-mail: vrensh@mail.ufs.ac.za (Dingie van Rensburg) OR neljc@mail.ufs.ac.za (Ohna Nel)

PLEASE, CONFIRM YOUR ATTENDANCE AS SOON AS POSSIBLE, BUT AT THE LATEST BEFORE 25 OCTOBER 2003 ? BY TELEPHONE, FAX OR E-MAIL.

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