Around the frozen edges of the southern continent, a long retreat of sea ice is reshaping the ocean, the wildlife that depends on it, and the vessels that serve research stations there. A multinational study led by researchers from the Australian Antarctic Program Partnership traces how a decade of unusually thin ice has left dark water to soak up more sunlight, nudging warming higher and calving more icebergs from the coast. Its authors place these changes within a larger human pattern in which emissions continue to push the cold places of the planet toward new states. The same moment has bro
Shrinking Antarctic Sea Ice Raises Iceberg Risks and Threatens Penguins, Shipping and Climate Monitoring
Dark water absorbs more sunlight without a reflective frozen barrier
Mark
Why does losing sea ice make the ocean warmer?
Mimi
Ice is reflective. Without it, dark open water takes in more sunlight, so the warming feeds itself.
Mark
And the iceberg finding?
Mimi
Years with the least summer sea ice produced more than twice as many icebergs as the years with the most.
Luke
That's a comparison between extreme years. The reporting doesn't say how much of it is cause and how much is association. It says low ice is "associated" with more icebergs.
Mark
What about the penguins?
Mimi
Adelie penguins need large chunks of ice for their moult, when they must stay dry for weeks. Less ice means fewer good spots and more exposure to predators.
Luke
Worth saying that's a risk the study identifies. The article gives no count of penguins actually harmed.
Mark
Then there's the data issue.
Mimi
Doddridge says the US Defense Department plans to stop sharing global sea ice satellite data, though other countries' satellites will still supply some.
Luke
"Plans to" is his account. We don't know the timing or how much would be lost. Jakob's warning about cloud data is conditional too: if satellites aren't renewed.
Mark
So what is solid?
Mimi
Ice has been consistently low since 2016, and the study's authors say that points to a rapid move to net zero.
El Pulso
- Sea ice around Antarctica has sat stubbornly low since 2016, with the most recent summers reaching extraordinary lows.
- The years of least summer ice produced more than twice as many icebergs as the years of most, unsettling both ocean and shipping routes.
- Adelie penguins, who need large floating ice to survive their weeks-long moult, are left with fewer safe places and more exposed to predators.
- The US Defense Department plans to halt sharing its global sea ice satellite data, and researchers warn of monitoring gaps that could blind climate science.
- Scientists are pressing for rapid cuts in emissions, while watching whether other nations' satellites can fill the widening hole in observation.
Around the frozen edges of the southern continent, a long retreat of sea ice is reshaping the ocean, the wildlife that depends on it, and the vessels that serve research stations there. A multinational study led by researchers from the Australian Antarctic Program Partnership traces how a decade of unusually thin ice has left dark water to soak up more sunlight, nudging warming higher and calving more icebergs from the coast. Its authors place these changes within a larger human pattern in which emissions continue to push the cold places of the planet toward new states. The same moment has brought doubt over whether the satellite records that let us see all of this will keep flowing.
A new international study, led by researchers from the Australian Antarctic Program Partnership, lays out what the loss of sea ice around Antarctica is doing to the ocean, the animals and the ships that work there. Lead author Edward Doddridge described the shift at a media briefing: until about 2015 the ice was near average, but since 2016 it has been consistently low, and the last few years have been extraordinarily so.
The surrounding waters were already warming. Without reflective ice, dark open water absorbs more sunlight, and researchers say the continuing loss is accelerating that trend. The study also links low summer ice to more icebergs breaking from the coast, with the thinnest-ice years producing more than twice as many as the years with the most.
The wildlife is exposed too. Adelie penguins need large pieces of ice for their weeks-long moult, when they must stay dry while shedding feathers. As ice thins, suitable spots become harder to find, and exposed birds become easier prey. Ships supplying Antarctic missions also face tougher conditions in low-ice seasons.
All of this arrives as the future of climate science is uncertain. Dr Doddridge said the US Defense Department plans to stop sharing its global sea ice satellite data, a prospect he called deeply concerning, though satellites from other countries will still supply some information. Christian Jakob of the ARC Centre of Excellence for 21st Century Weather warned that satellite records on global cloud cover, central to understanding unexpectedly fast warming, could disappear without successor missions.
Co-author Will Hobbs, of the University of Tasmania's AAPP, said the findings support a rapid transition to net zero, warning that continued emissions will accelerate changes already visible in Antarctica and the Southern Ocean. The open question now is whether the Defense Department follows through, and whether other satellites can close the gap.
A new international study, led by researchers from the Australian Antarctic Program Partnership, sets out what the loss of sea ice around Antarctica is doing to the ocean, the animals and the ships that work there. The picture it draws is of consequences that are serious and varied, and it arrives just as some of the data used to track them is in doubt.
The lead author, Edward Doddridge of the AAPP, described the shift during a media briefing. Until about 2015, he said, Antarctic sea ice was around average, even a little above. Since 2016 it has been consistently low, and the last few years have been extraordinarily low.
The waters surrounding the southern continent were already trending warmer than average. Researchers say the continuing loss of ice is adding to that trend: without a reflective frozen surface, dark open water absorbs more sunlight, and the ocean warms further.
The study also links low summer sea ice to more icebergs breaking away from the coastline. The years with the least summer sea ice produced more than twice as many icebergs as the years with the most.
Wildlife is exposed too. Crabeater seals and Adelie penguins depend on sea ice for habitat. For the penguins, the concern centres on what the study calls the "catastrophic moult," when they must stay dry for weeks at a time while shedding their feathers. They need large pieces of ice for that. With less ice, finding a suitable spot gets harder, and penguins left more exposed are more vulnerable to predators.
Ships supplying Antarctic missions are affected as well. The study found that low ice coverage makes conditions tougher for those vessels.
The findings come amid uncertainty over the future of global climate science under the Trump administration. Dr Doddridge said the US Department of Defense plans to stop sharing its global sea ice coverage satellite data with the international community. He called the uncertainty deeply concerning, though he noted that satellites from other countries would keep supplying some information.
Other Australian-based researchers are watching similar risks to earth observation data and climate modelling, given the major role the United States has traditionally played. Christian Jakob, director of the Australian Research Council Centre of Excellence for 21st Century Weather, said he was worried about possibly losing access to satellite data that is central to research on global cloud cover. Shrinking cloud cover is thought to be contributing to unexpectedly fast warming. "If those satellites were not renewed, if there were no successors to these satellite missions, then some of the information we have will disappear," Professor Jakob told AAP.
The study acknowledges a number of knowledge gaps. Co-author Will Hobbs, also of the University of Tasmania's AAPP, said the findings support a rapid transition to net zero. He said climate projections indicate continued greenhouse gas emissions will accelerate the changes already seen in Antarctica and the Southern Ocean and worsen the far-reaching harms of sea ice loss.
What to watch next is whether the Defense Department follows through on ending its data sharing, and whether other nations' satellites can fill the gap.
Citas Notables
Since 2016 it has been consistently low, and the last few years have been extraordinarily low.— Edward Doddridge, lead author, AAPP
If those satellites were not renewed, if there were no successors to these satellite missions, then some of the information we have will disappear.— Professor Christian Jakob
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