Scale of microplastics in Antarctic revealed in preliminary survey results

(Image: IAEA)

By Alex Hunt, World Nuclear News, in Vienna

The first results of the pioneering scientific research project launched earlier this year have catalogued microplastic particles in the sea water, sediment and animals in Antarctica.

The preliminary results were outlined during an International Atomic Energy Agency (IAEA) General Conference session focusing on the study, which is supported by Argentina and forms part of the wider IAEA NUTEC plastics initiative, which aims to use nuclear technologies to tackle plastic pollution.

Nathalie Bernard, from the IAEA Marine Environment Laboratories and University of Buenos Aires, unveiling the results, said that "sadly we have found microplastics everywhere, on every sample, every matrix". She said that the concentrations of microplastics varied by location and by day.

More than 250 samples were collected from the Almirante Irizer icebreaker, which sailed 27,209 kilometres over 125 days covering 84 sampling stations. Over the course of a week 166 samples were collected from Argentina's Carlini research station base as part of what was described as the first study of microplastics pollution from South America to Antarctica.

The samples were of water, of sediment and also of penguin droppings and shellfish. Bernard said: "All of these results were possible thanks to nuclear techniques, specifically vibrational microspectroscopy which allows us not only to count, but also identify polymers. We were able to analyse particles as small as 20 microns (WNN note: for comparison a human hair is about 100 microns) and this is important because we found out that almost 90% of the particles we analysed were smaller than 100 microns and ... most of the studies conducted before have focused on larger particles, larger than 300 microns, which clearly overlooks the larger majority."

The preliminary results - with 30% of the samples analysed so far, found that in terms of distribution in water, in Buenos Aires it was 256 microplastic particles per litre, compared with 5 microplastics particles per litre in the Antarctic Ocean and 21 microplastics particles per litre at Carlini Station in the Antarctic.

The Carlini samples found 6000-15,000 microplastic particles per kilogramme of sediment, 15 microplastic particles per square metre of sand and 200-4000 microplastic particles per biological sample of shellfish or penguin droppings.

The prevalence and type of microplastics was shown to the session (Image: WNN photo/IAEA/Bernard slide)

There were 11 different types of plastics found in the samples, 62% were "Teflon-like microplastics" and 29% were polyethylene-like. Examples of the types of products using the types of plastics found included frying pans, PVC pipes and plastic drinks bottles.

The early theories about the possible sources of the pollution in Antarctica include fisheries, local human activities and global sources, via the atmosphere or ocean currents.

Bernard said that the conclusions of the preliminary study was that "we know now that microplastics are everywhere, that we can find different levels and types between the sites and that the levels in Antarctica are relatively low if we compare them with highly populated industrial zones - but they are far away from zero, which is what it was thought to be until recently in Antarctica.".

The next steps are to finalise the analysis and do extra checks before sharing the results globally and using the figures as a baseline for future surveys, to assess possible pollution sources and inform policy makers for local and global actions in line with the Antarctic Treaty.

The meeting also heard progress reports on the United Nations actions to end plastics pollution and how the NUTEC initiative can help with plastics upcycling using irradiation to allow plastic waste to not just be traditionally recycled, but also used in cement or in wood/plastic composits - one of the examples given was Argentina using radiation-modified railway sleepers from plastic waste.

Argentina's Foreign Affairs Minister Diana Mondino said that the country was one of the original signatories of the Antarctic Treaty and said: "There's growing concern in understanding the impact in the Antarctic ecosystem from plastics and microplastics." She said the results had prompted the creation of a regional group in Latin America led by Argentina to focus on the issue.

IAEA Director General Rafael Mariano Grossi said the NUTEC initiative had been well received because "we do have a serious problem with microplastics, nanoplastics and we did also have a scarcity of information, objective information". He said having the facts was important so people can take "informed decisions when it comes to the protection of this environment, which is so pristine and that we all care for".

"This is not a simple environmental endeavour that we take for the sake of knowing a little bit more - the idea is that we provide important information that is relevant for fisheries, relevant for very important economic activities in all our countries."

Australia's ambassador Ian Biggs said that Australia had a major stake in the international effort in Antarctica and he said that according to projections there could soon be a tonne of plastic in the ocean for every three tonnes of fish, saying this showed the necessity of action to tackle plastic pollution and he said Australia believed that the NUTEC programme was "making a real difference in helping countries address pressing global challenges on plastic pollution".

More than 400 samples were taken during the study (Image: Still from IAEA video)

The background

The IAEA's NUTEC plastics scheme was established in 2020 and uses a series of monitoring laboratories to use nuclear technology to sample and analyse microplastics - which are bits of plastic less than 5 millimetres in diameter - in the environment. There are more than 60 countries participating in monitoring of microplastics in the sea, and the goal is to equip more than 50 laboratories with the technology to form a global monitoring network.

The aim is to then be able to take action to bring in measures designed to reduce the sources of the pollution - at least 30 countries are involved in developing innovative recycling technology, including using irradiation to treat plastics and make them fit for reuse, or for a wider range of reuses. This process uses gamma and electron beam radiation technologies to modify certain types of plastic waste, breaking down plastic polymers judged not to be of sufficient quality into smaller components and then allowing them to be used to generate new plastic products.

The IAEA cites studies suggesting that only around 10% of plastic produced between 1950 and 2015 has been recycled, with the majority (about 60%) going to landfill, meaning action is imperative given estimates that there will be one tonne of plastic for every three tonnes of fish within a few years.

Grossi visited an IAEA mission in Antarctica in January with Argentina's president to see the start of work for the project, with the IAEA explaining that "there is still almost no information available on where and how much microplastics arrive in the Antarctic and how much is taken up by Antarctic organisms. There is also very little data existing on the types of microplastics reaching this pristine area through ocean currents, atmospheric deposition and the presence of humans in the Antarctic".It also said the "presence of microplastics can contribute to accelerating the ice-loss in Antarctica by reducing ice reflectivity, altering surface roughness, promoting microbial activity, acting as thermal insulators, and contributing to mechanical weakening of the ice structure". Scale of microplastics in Antarctic revealed in preliminary survey results

Read More........→August 14, 2025

Antarctica has a huge, completely hidden mountain range. New data reveals its birth over 500 million years ago

Jacqueline Halpin, University of Tasmania and Nathan R. Daczko, Macquarie University

Have you ever imagined what Antarctica looks like beneath its thick blanket of ice? Hidden below are rugged mountains, valleys, hills and plains.

Some peaks, like the towering Transantarctic Mountains, rise above the ice. But others, like the mysterious and ancient Gamburtsev Subglacial Mountains in the middle of East Antarctica, are completely buried.

The Gamburtsev Mountains are similar in scale and shape to the European Alps. But we can’t see them because the high alpine peaks and deep glacial valleys are entombed beneath kilometres of ice.

How did they come to be? Typically, a mountain range will rise in places where two tectonic plates clash with each other. But East Antarctica has been tectonically stable for millions of years.

Our new study, published in Earth and Planetary Science Letters, reveals how this hidden mountain chain emerged more than 500 million years ago when the supercontinent Gondwana formed from colliding tectonic plates.

Our findings offer fresh insight into how mountains and continents evolve over geological time. They also help explain why Antarctica’s interior has remained remarkably stable for hundreds of millions of years.

A radar image showing the Gamburtsev mountain range under layers of ice. Creyts et al., Geophysical Research Letters (2014), CC BY-SA

A buried secret

The Gamburtsev Mountains are buried beneath the highest point of the East Antarctica ice sheet. They were first discovered by a Soviet expedition using seismic techniques in 1958.

Because the mountain range is completely covered in ice, it’s one of the least understood tectonic features on Earth. For scientists, it’s deeply puzzling. How could such a massive mountain range form and still be preserved in the heart of an ancient, stable continent?

Most major mountain chains mark the sites of tectonic collisions. For example, the Himalayas are still rising today as the Indian and Eurasian plates continue to converge, a process that began about 50 million years ago.

Plate tectonic models suggest the crust now forming East Antarctica came from at least two large continents more than 700 million years ago. These continents used to be separated by a vast ocean basin.

A map of the topography (a) and surface elevation (b) of Antarctica, measured in metres above sea level; (c) shows ice thickness in metres. Pritchard et al., Scientific Data (2025), CC BY

The collision of these landmasses was key to the birth of Gondwana, a supercontinent that included what is now Africa, South America, Australia, India and Antarctica.

Our new study supports the idea that the Gamburtsev Mountains first formed during this ancient collision. The colossal clash of continents triggered the flow of hot, partly molten rock deep beneath the mountains.

As the crust thickened and heated during mountain building, it eventually became unstable and began to collapse under its own weight.

Deep beneath the surface, hot rocks began to flow sideways, like toothpaste squeezed from a tube, in a process known as gravitational spreading. This caused the mountains to partially collapse, while still preserving a thick crustal “root”, which extends into Earth’s mantle beneath.

Mountain building causes deep crustal rocks to deform, fold and partially melt. Jacqueline Halpin

Crystal time capsules

To piece together the timing of this dramatic rise and fall, we analysed tiny zircon grains found in sandstones deposited by rivers flowing from the ancient mountains more than 250 million years ago. These sandstones were recovered from the Prince Charles Mountains, which poke out of the ice hundreds of kilometres away.

Zircons are often called “time capsules” because they contain minuscule amounts of uranium in their crystal structure, which decays at a known rate and allows scientists to determine their age with great precision.

These zircon grains preserve a record of the mountain-building timeline: the Gamburtsev Mountains began to rise around 650 million years ago, reached Himalayan heights by 580 million years ago, and experienced deep crustal melting and flow that ended around 500 million years ago.

Most mountain ranges formed by continental collisions are eventually worn down by erosion or reshaped by later tectonic events. Because they’ve been preserved by a deep layer of ice, the Gamburtsev Subglacial Mountains are one of the best-preserved ancient mountain belts on Earth.

While it’s currently very challenging and expensive to drill through the thick ice to sample the mountains directly, our model offers new predictions to guide future exploration.

Geologists Jacqueline Halpin and Jack Mulder stand on the Denman Glacier during recent fieldwork. Jacqueline Halpin

For instance, recent fieldwork near the Denman Glacier on East Antarctica’s coast uncovered rocks that may be related to these ancient mountains. Further analysis of these rock samples will help reconstruct the hidden architecture of East Antarctica.

Antarctica remains a continent full of geological surprises, and the secrets buried beneath its ice are only beginning to be revealed.

Jacqueline Halpin, Associate Professor of Geology, University of Tasmania and Nathan R. Daczko, Professor of Earth Science, Macquarie University

This article is republished from The Conversation under a Creative Commons license. Read the original article.

Read More........→May 14, 2025

Scientists in Antarctica: why they’re there and what they’ve found

David William Hedding, University of South Africa

A media storm blew up in mid-March 2025 when a researcher at South Africa’s isolated Sanae IV base in Antarctica accused one of its nine team members of becoming violent.

The Conversation Africa asked geomorphologist David William Hedding, who has previously carried out research from the frozen continent, about the work researchers do in Antarctica, what conditions are like and why it matters.

What do researchers focus on when they’re working in Antarctica?

Currently, the main focus of research in the Antarctic revolves around climate change because the White Continent is a good barometer for changes in global cycles. It has a unique and fragile environment. It’s an extreme climate which makes it highly sensitive to any changes in global climate and atmospheric conditions. Importantly, the Antarctic remains relatively untouched by humans, so we are able to study processes and responses of natural systems.

Also, the geographic location of Antarctic enables science that is less suitable elsewhere on the planet. An example of this is the work on space weather (primarily disturbances to the Earth’s magnetic field caused by solar activity). Studying space weather is significant because the magnetic field of the Earth can impact communication platforms, technology, infrastructure and even human health.

How many countries have teams working there? Where does South Africa fit in?

Currently, about 30 countries have research stations in the Antarctic but these bases serve a far wider community of researchers. Collaboration is a key component of research in the Antarctic because many study sites are isolated, logistics are a challenge and resources are typically limited.

The South African base in Antarctica, named SANAE IV usually has between 10 and 12 researchers and base personnel. This research station is situated on a nunatak (a mountain piercing through the ice) in Western Dronning Maud Land. It is an extremely remote location approximately 220km inland from the ice-shelf.

The researchers and base personnel remain in Antarctica for approximately 15 months working through the cold and dark winter months.

What have been some of the biggest ‘finds’?

The biggest research finding from the Antarctic was the discovery of the ozone hole in 1985 by scientists from the British Antarctic Survey. This discovery led to the creation and implementation of the Montreal Protocol, a treaty to phase out chlorofluorocarbons (synthetic chemical compounds composed of chlorine, fluorine, and carbon) which destroy ozone. This was a major breakthrough in terms of slowly healing the ozone layer.

The second most significant piece of research to come from the Antarctic has been the use of ice cores to reconstruct past climates. Ice cores preserve air bubbles which provide a wealth of information about the conditions of the atmosphere over time. Importantly, ice cores provide an uninterrupted and detailed window into the past 1.2 million years. This is important because only by understanding past climates and the earth’s responses to those changes are we able to predict future responses. This is significant because of the imminent threats resulting from anthropogenic (human-induced) climate change.

What conditions do scientists work under?

Conducting research in the Antarctic is extremely difficult for three primary reasons: remoteness, the cold and daylight.

The remoteness of many study sites makes it difficult to reach. Distances are vast from the limited number of bases in the Antarctic. Thus, logistics for science in the Antarctic is a major challenge and requires collaboration and planning. For example, the geologists from the University of Johannesburg, who work from the SANAE IV base in Antarctica, often spend weeks in the field collecting samples. They travel significant distances via snow mobile and remain self-sufficient while conducting science in tough conditions.

These tough conditions relate specifically to the cold. Most science only occurs in the austral summer months when temperatures become marginally bearable. Also, the summer season only provides a short window in which to operate because access to Antarctic by sea is limited by extent and thickness of the sea ice.

Lastly, during summer there is 24 hours of daylight which lengthens the working day but these conditions are also short-lived.

Why it is important to do scientific work in the area?

The Antarctic is intricately linked to global systems and plays a major role in influencing these systems.

For example, climate change will cause significant melting of land-based ice in Antarctica which when added to the oceans will cause sea-level rise and disruptions to global oceanic currents. Therefore, it is critical that we obtain a better understanding of how responses of terrestrial systems, such as the Antarctic, will impact oceanic systems because ultimately changes in ocean currents will impact the oceanic food web.

In the context of climate change, sea-level rise is a major concern as it will have global impacts for society, so it is critical that the impacts are investigated to enable society to build resilience and adapt.

David William Hedding, Associate Professor in Geography, University of South Africa

This article is republished from The Conversation under a Creative Commons license. Read the original article.

Read More........→April 03, 2025

Scientists in Antarctica: why they’re there and what they’ve found

David William Hedding, University of South Africa

A media storm blew up in mid-March 2025 when a researcher at South Africa’s isolated Sanae IV base in Antarctica accused one of its nine team members of becoming violent.

The Conversation Africa asked geomorphologist David William Hedding, who has previously carried out research from the frozen continent, about the work researchers do in Antarctica, what conditions are like and why it matters.

What do researchers focus on when they’re working in Antarctica?

Currently, the main focus of research in the Antarctic revolves around climate change because the White Continent is a good barometer for changes in global cycles. It has a unique and fragile environment. It’s an extreme climate which makes it highly sensitive to any changes in global climate and atmospheric conditions. Importantly, the Antarctic remains relatively untouched by humans, so we are able to study processes and responses of natural systems.

Also, the geographic location of Antarctic enables science that is less suitable elsewhere on the planet. An example of this is the work on space weather (primarily disturbances to the Earth’s magnetic field caused by solar activity). Studying space weather is significant because the magnetic field of the Earth can impact communication platforms, technology, infrastructure and even human health.

How many countries have teams working there? Where does South Africa fit in?

Currently, about 30 countries have research stations in the Antarctic but these bases serve a far wider community of researchers. Collaboration is a key component of research in the Antarctic because many study sites are isolated, logistics are a challenge and resources are typically limited.

The South African base in Antarctica, named SANAE IV usually has between 10 and 12 researchers and base personnel. This research station is situated on a nunatak (a mountain piercing through the ice) in Western Dronning Maud Land. It is an extremely remote location approximately 220km inland from the ice-shelf.

The researchers and base personnel remain in Antarctica for approximately 15 months working through the cold and dark winter months.

What have been some of the biggest ‘finds’?

The biggest research finding from the Antarctic was the discovery of the ozone hole in 1985 by scientists from the British Antarctic Survey. This discovery led to the creation and implementation of the Montreal Protocol, a treaty to phase out chlorofluorocarbons (synthetic chemical compounds composed of chlorine, fluorine, and carbon) which destroy ozone. This was a major breakthrough in terms of slowly healing the ozone layer.

The second most significant piece of research to come from the Antarctic has been the use of ice cores to reconstruct past climates. Ice cores preserve air bubbles which provide a wealth of information about the conditions of the atmosphere over time. Importantly, ice cores provide an uninterrupted and detailed window into the past 1.2 million years. This is important because only by understanding past climates and the earth’s responses to those changes are we able to predict future responses. This is significant because of the imminent threats resulting from anthropogenic (human-induced) climate change.

What conditions do scientists work under?

Conducting research in the Antarctic is extremely difficult for three primary reasons: remoteness, the cold and daylight.

The remoteness of many study sites makes it difficult to reach. Distances are vast from the limited number of bases in the Antarctic. Thus, logistics for science in the Antarctic is a major challenge and requires collaboration and planning. For example, the geologists from the University of Johannesburg, who work from the SANAE IV base in Antarctica, often spend weeks in the field collecting samples. They travel significant distances via snow mobile and remain self-sufficient while conducting science in tough conditions.

These tough conditions relate specifically to the cold. Most science only occurs in the austral summer months when temperatures become marginally bearable. Also, the summer season only provides a short window in which to operate because access to Antarctic by sea is limited by extent and thickness of the sea ice.

Lastly, during summer there is 24 hours of daylight which lengthens the working day but these conditions are also short-lived.

Why it is important to do scientific work in the area?

The Antarctic is intricately linked to global systems and plays a major role in influencing these systems.

For example, climate change will cause significant melting of land-based ice in Antarctica which when added to the oceans will cause sea-level rise and disruptions to global oceanic currents. Therefore, it is critical that we obtain a better understanding of how responses of terrestrial systems, such as the Antarctic, will impact oceanic systems because ultimately changes in ocean currents will impact the oceanic food web.

In the context of climate change, sea-level rise is a major concern as it will have global impacts for society, so it is critical that the impacts are investigated to enable society to build resilience and adapt.

David William Hedding, Associate Professor in Geography, University of South Africa

This article is republished from The Conversation under a Creative Commons license. Read the original article.

Read More........→March 26, 2025

Melting Antarctic ice will slow the world’s strongest ocean current – and the global consequences are profound

Taimoor Sohail, The University of Melbourne and Bishakhdatta Gayen, The University of Melbourne

Flowing clockwise around Antarctica, the Antarctic Circumpolar Current is the strongest ocean current on the planet. It’s five times stronger than the Gulf Stream and more than 100 times stronger than the Amazon River.

It forms part of the global ocean “conveyor belt” connecting the Pacific, Atlantic, and Indian oceans. The system regulates Earth’s climate and pumps water, heat and nutrients around the globe.

But fresh, cool water from melting Antarctic ice is diluting the salty water of the ocean, potentially disrupting the vital ocean current.

Our new research suggests the Antarctic Circumpolar Current will be 20% slower by 2050 as the world warms, with far-reaching consequences for life on Earth.

The Antarctic Circumpolar Current keeps Antarctica isolated from the rest of the global ocean, and connects the Atlantic, Pacific and Indian oceans. Sohail, T., et al (2025), Environmental Research Letters., CC BY

Why should we care?

The Antarctic Circumpolar Current is like a moat around the icy continent.

The current helps to keep warm water at bay, protecting vulnerable ice sheets. It also acts as a barrier to invasive species such as southern bull kelp and any animals hitching a ride on these rafts, spreading them out as they drift towards the continent. It also plays a big part in regulating Earth’s climate.

Unlike better known ocean currents – such as the Gulf Stream along the United States East Coast, the Kuroshio Current near Japan, and the Agulhas Current off the coast of South Africa – the Antarctic Circumpolar Current is not as well understood. This is partly due to its remote location, which makes obtaining direct measurements especially difficult.

Understanding the influence of climate change

Ocean currents respond to changes in temperature, salt levels, wind patterns and sea-ice extent. So the global ocean conveyor belt is vulnerable to climate change on multiple fronts.

Previous research suggested one vital part of this conveyor belt could be headed for a catastrophic collapse.

Theoretically, warming water around Antarctica should speed up the current. This is because density changes and winds around Antarctica dictate the strength of the current. Warm water is less dense (or heavy) and this should be enough to speed up the current. But observations to date indicate the strength of the current has remained relatively stable over recent decades.

This stability persists despite melting of surrounding ice, a phenomenon that had not been fully explored in scientific discussions in the past.

What we did

Advances in ocean modelling allow a more thorough investigation of the potential future changes.

We used Australia’s fastest supercomputer and climate simulator in Canberra to study the Antarctic Circumpolar Current. The underlying model, ACCESS-OM2-01, has been developed by Australian researchers from various universities as part of the Consortium for Ocean-Sea Ice Modelling in Australia.

The model captures features others often miss, such as eddies. So it’s a far more accurate way to assess how the current’s strength and behaviour will change as the world warms. It picks up the intricate interactions between ice melting and ocean circulation.

In this future projection, cold, fresh melt water from Antarctica migrates north, filling the deep ocean as it goes. This causes major changes to the density structure of the ocean. It counteracts the influence of ocean warming, leading to an overall slowdown in the current of as much as 20% by 2050.

Far-reaching consequences

The consequences of a weaker Antarctic Circumpolar Current are profound and far-reaching.

As the main current that circulates nutrient-rich waters around Antarctica, it plays a crucial role in the Antarctic ecosystem.

Weakening of the current could reduce biodiversity and decrease the productivity of fisheries that many coastal communities rely on. It could also aid the entry of invasive species such as southern bull kelp to Antarctica, disrupting local ecosystems and food webs.

A weaker current may also allow more warm water to penetrate southwards, exacerbating the melting of Antarctic ice shelves and contributing to global sea-level rise. Faster ice melting could then lead to further weakening of the current, commencing a vicious spiral of current slowdown.

This disruption could extend to global climate patterns, reducing the ocean’s ability to regulate climate change by absorbing excess heat and carbon in the atmosphere.

Ocean currents around the world (NASA)

Need to reduce emissions

While our findings present a bleak prognosis for the Antarctic Circumpolar Current, the future is not predetermined. Concerted efforts to reduce greenhouse gas emissions could still limit melting around Antarctica.

Establishing long-term studies in the Southern Ocean will be crucial for monitoring these changes accurately.

With proactive and coordinated international actions, we have a chance to address and potentially avert the effects of climate change on our oceans.

The authors thank Polar Climate Senior Researcher Dr Andreas Klocker, from the NORCE Norwegian Research Centre and Bjerknes Centre for Climate Research, for his contribution to this research, and Professor Matthew England from the University of New South Wales, who provided the outputs from the model simulation for this analysis.

Taimoor Sohail, Postdoctoral Researcher, School of Geography, Earth and Atmospheric Sciences, The University of Melbourne and Bishakhdatta Gayen, ARC Future Fellow & Associate Professor, Mechanical Engineering, The University of Melbourne

This article is republished from The Conversation under a Creative Commons license. Read the original article.

Read More........→March 17, 2025