What happens in the Antarctic doesn't stay in the Antarctic, ice-sheet modeller says
Issued on: 21/08/2025 - FRANCE24
A new study published in Nature reveals 'evidence for rapid, interacting and sometimes self-perpetuating changes in the Antarctic'. Speaking on FRANCE 24, glaciologist and ice-sheet modeller Frank Pattyn, Chair of the Belgian National Committee on Arctic/Antarctic Research, says that 'what happens in the Antarctic doesn't stay in the Antarctic' and that 'we haven't seen all the change yet that should be induced' by current global warming.
Issued on: 21/08/2025 - FRANCE24
A new study published in Nature reveals 'evidence for rapid, interacting and sometimes self-perpetuating changes in the Antarctic'. Speaking on FRANCE 24, glaciologist and ice-sheet modeller Frank Pattyn, Chair of the Belgian National Committee on Arctic/Antarctic Research, says that 'what happens in the Antarctic doesn't stay in the Antarctic' and that 'we haven't seen all the change yet that should be induced' by current global warming.
Video by: Sharon GAFFNEY
By AFP
August 20, 2025
The white continent is melting: Researchers are sounding the alarm about the threats to Antarctica - Copyright University of Santiago USACH/AFP Jose Jorquera
Soaring numbers of tourists and expanding research projects are increasingly polluting Antarctica, scientists warned Wednesday, a fresh blow for one of Earth’s most pristine environments already threatened by human-driven climate change.
In Antarctic areas where humans have been active, the concentration of fine particles containing heavy metals is 10 times higher than it was 40 years ago, the international team of researchers said in a new study.
That change has come as the number of annual tourists visiting the white continent has risen from 20,000 to 120,000 over the last two decades, according to the International Association of Antarctica Tour Operators.
“The increasing human presence in Antarctica raises concerns about pollutants from fossil fuel combustion, including those from ships, aircraft, vehicles and supporting infrastructure,” the study in the journal Nature Sustainability said.
Ships carrying tourists are powered by dirty fossil fuels, which are the source of fine particles containing things like nickel, copper, zinc and lead.
“Snow melts faster in Antarctica due to the presence of polluting particles in areas frequented by tourists,” study co-author Raul Cordero told AFP.
“A single tourist can contribute to accelerating the melting of around 100 tons of snow,” said the scientist at the University of Groningen in the Netherlands.
The researchers — from countries including Chile and Germany — spent four years traveling 1,200 miles (2,000 kilometers) in Antarctica to measure the contamination.
The presence of heavy metals has also increased due to scientific expeditions. Research projects that stay for an extended time can have up to 10 times more of an impact than a single tourist, Cordero said.
The study acknowledged there have been “meaningful steps forward” in attempts to protect Antarctica, such as a ban on highly polluting heavy fuel oil and the tourism industry embracing electric-hybrid ships.
“Nevertheless, our results show that more remains to be done to reduce the burdens of human activities in Antarctica,” including speeding up the transition to renewable energy and slashing fossil fuel use, the study said.
A different Nature study also published on Wednesday warned that potentially irreversible changes in Antarctica driven by climate change could lift global oceans by meters and lead to “catastrophic consequences for generations.”
The white continent is melting: Researchers are sounding the alarm about the threats to Antarctica - Copyright University of Santiago USACH/AFP Jose Jorquera
Soaring numbers of tourists and expanding research projects are increasingly polluting Antarctica, scientists warned Wednesday, a fresh blow for one of Earth’s most pristine environments already threatened by human-driven climate change.
In Antarctic areas where humans have been active, the concentration of fine particles containing heavy metals is 10 times higher than it was 40 years ago, the international team of researchers said in a new study.
That change has come as the number of annual tourists visiting the white continent has risen from 20,000 to 120,000 over the last two decades, according to the International Association of Antarctica Tour Operators.
“The increasing human presence in Antarctica raises concerns about pollutants from fossil fuel combustion, including those from ships, aircraft, vehicles and supporting infrastructure,” the study in the journal Nature Sustainability said.
Ships carrying tourists are powered by dirty fossil fuels, which are the source of fine particles containing things like nickel, copper, zinc and lead.
“Snow melts faster in Antarctica due to the presence of polluting particles in areas frequented by tourists,” study co-author Raul Cordero told AFP.
“A single tourist can contribute to accelerating the melting of around 100 tons of snow,” said the scientist at the University of Groningen in the Netherlands.
The researchers — from countries including Chile and Germany — spent four years traveling 1,200 miles (2,000 kilometers) in Antarctica to measure the contamination.
The presence of heavy metals has also increased due to scientific expeditions. Research projects that stay for an extended time can have up to 10 times more of an impact than a single tourist, Cordero said.
The study acknowledged there have been “meaningful steps forward” in attempts to protect Antarctica, such as a ban on highly polluting heavy fuel oil and the tourism industry embracing electric-hybrid ships.
“Nevertheless, our results show that more remains to be done to reduce the burdens of human activities in Antarctica,” including speeding up the transition to renewable energy and slashing fossil fuel use, the study said.
A different Nature study also published on Wednesday warned that potentially irreversible changes in Antarctica driven by climate change could lift global oceans by meters and lead to “catastrophic consequences for generations.”
Antarctic climate shifts threaten ‘catastrophic’ impacts globally
By AFP
August 20, 2025
Shifts in different facets of Antarctica's climate system amplify each other and accelerate the pace of warming globally as well - Copyright Louisiana State University/AFP/File Michael Polito
Marlowe HOOD
Abrupt and potentially irreversible changes in Antarctica driven by climate change could lift global oceans by metres and lead to “catastrophic consequences for generations”, scientists warned Wednesday.
More broadly, a state-of-knowledge review by a score of top experts revealed accelerating shifts across the region that are often both cause and effect of global warming, according to a study published in Nature.
“Antarctica is showing worrying signs of rapid change across its ice, ocean and ecosystems,” lead author and Australian National University professor Nerilie Abram told AFP.
“Some of these abrupt changes will be difficult to stop.”
Shifts in different facets of Antarctica’s climate system amplify each other and have accelerated the pace of warming globally as well, she said.
The study looked at evidence of abrupt change — or “regime shifts” — in sea ice, regional ocean currents, the continent’s ice sheet and ice shelves, and marine life. It also examined how they interact.
Floating sea ice does not add to sea level when it melts. But its retreat does replace white surfaces that reflect almost all of the Sun’s energy back into space with deep blue water, which absorbs the same amount instead.
Ninety percent of the heat generated by manmade global warming is soaked up by oceans.
– Retreating sea ice –
After increasing slightly during the first 35 years that satellite data was available, Antarctic sea ice cover plunged dramatically over the last decade.
Since 2014, sea ice has retreated on average 120 kilometres (75 miles) from the continent’s shoreline. That contraction has happened about three times faster in 10 years than the decline in Arctic sea ice over nearly 50.
The “overwhelming evidence of a regime shift in sea ice” means that, on current trends, Antarctica could essentially become ice free in summer sooner than the Arctic, the study found.
This will speed up warming in the region and beyond, and could push some marine species toward extinction.
Over the last two years, for example, helpless emperor penguin chicks perished at multiple breeding grounds, drowning or freezing to death when sea ice gave way earlier than usual under their tiny feet.
Of five sites monitored in the Bellingshausen Sea region in 2023, all but one experienced a 100 percent loss of chicks, earlier research reported.
Unlike sea ice, ice sheets and the ice shelves to which they are connected are on — or supported by — land.
The world would need to heat up by five degrees Celsius compared with pre-industrial levels to melt the entire Antarctic ice sheet, which would lift global oceans an almost unimaginable 58 metres (nearly 200 feet).
– Point of no return –
But global warming to date — on average about 1.3C — is fast approaching a threshold that would cause part of the ice sheet to generate at least three metres of sea level rise, flooding coastal areas inhabited today by hundreds of millions, the study said.
“Unstoppable collapse of the West Antarctic Ice Sheet is one of the most concerning global tipping points,” said Abram.
“The evidence points to this being triggered at global warming well below 2C.”
Another potential risk is the collapse of the Antarctic Overturning Circulation, a system of ocean currents that distribute heat and nutrients within the the region and globally.
A “rapid and substantial slowdown” of the currents has already begun, and evidence from the previous interglacial period — between two ice ages — before our own, 125,000 years ago, points to an abrupt stagnation of the system under conditions similar to those seen today.
“This would lead to widespread climate and ecosystem impacts,” ranging from an intensification of global warming to a decrease in the ocean’s capacity to absorb CO2, the study reported.
Ultimately, the only way to slow down the interlocking changes is to stop adding more planet-warming gases into the atmosphere.
“The greenhouse gas emission decisions that we make over the coming decade or two will lock in how much ice we will lose and how quickly it will be lost,” Abram said.
By AFP
August 20, 2025
Shifts in different facets of Antarctica's climate system amplify each other and accelerate the pace of warming globally as well - Copyright Louisiana State University/AFP/File Michael Polito
Marlowe HOOD
Abrupt and potentially irreversible changes in Antarctica driven by climate change could lift global oceans by metres and lead to “catastrophic consequences for generations”, scientists warned Wednesday.
More broadly, a state-of-knowledge review by a score of top experts revealed accelerating shifts across the region that are often both cause and effect of global warming, according to a study published in Nature.
“Antarctica is showing worrying signs of rapid change across its ice, ocean and ecosystems,” lead author and Australian National University professor Nerilie Abram told AFP.
“Some of these abrupt changes will be difficult to stop.”
Shifts in different facets of Antarctica’s climate system amplify each other and have accelerated the pace of warming globally as well, she said.
The study looked at evidence of abrupt change — or “regime shifts” — in sea ice, regional ocean currents, the continent’s ice sheet and ice shelves, and marine life. It also examined how they interact.
Floating sea ice does not add to sea level when it melts. But its retreat does replace white surfaces that reflect almost all of the Sun’s energy back into space with deep blue water, which absorbs the same amount instead.
Ninety percent of the heat generated by manmade global warming is soaked up by oceans.
– Retreating sea ice –
After increasing slightly during the first 35 years that satellite data was available, Antarctic sea ice cover plunged dramatically over the last decade.
Since 2014, sea ice has retreated on average 120 kilometres (75 miles) from the continent’s shoreline. That contraction has happened about three times faster in 10 years than the decline in Arctic sea ice over nearly 50.
The “overwhelming evidence of a regime shift in sea ice” means that, on current trends, Antarctica could essentially become ice free in summer sooner than the Arctic, the study found.
This will speed up warming in the region and beyond, and could push some marine species toward extinction.
Over the last two years, for example, helpless emperor penguin chicks perished at multiple breeding grounds, drowning or freezing to death when sea ice gave way earlier than usual under their tiny feet.
Of five sites monitored in the Bellingshausen Sea region in 2023, all but one experienced a 100 percent loss of chicks, earlier research reported.
Unlike sea ice, ice sheets and the ice shelves to which they are connected are on — or supported by — land.
The world would need to heat up by five degrees Celsius compared with pre-industrial levels to melt the entire Antarctic ice sheet, which would lift global oceans an almost unimaginable 58 metres (nearly 200 feet).
– Point of no return –
But global warming to date — on average about 1.3C — is fast approaching a threshold that would cause part of the ice sheet to generate at least three metres of sea level rise, flooding coastal areas inhabited today by hundreds of millions, the study said.
“Unstoppable collapse of the West Antarctic Ice Sheet is one of the most concerning global tipping points,” said Abram.
“The evidence points to this being triggered at global warming well below 2C.”
Another potential risk is the collapse of the Antarctic Overturning Circulation, a system of ocean currents that distribute heat and nutrients within the the region and globally.
A “rapid and substantial slowdown” of the currents has already begun, and evidence from the previous interglacial period — between two ice ages — before our own, 125,000 years ago, points to an abrupt stagnation of the system under conditions similar to those seen today.
“This would lead to widespread climate and ecosystem impacts,” ranging from an intensification of global warming to a decrease in the ocean’s capacity to absorb CO2, the study reported.
Ultimately, the only way to slow down the interlocking changes is to stop adding more planet-warming gases into the atmosphere.
“The greenhouse gas emission decisions that we make over the coming decade or two will lock in how much ice we will lose and how quickly it will be lost,” Abram said.
