Sea ice can be ‘early warning system' for global heating — but the US is halting data sharing
Scientists analysing the cascading impacts of record low levels of Antarctic sea ice fear a loss of critical US government satellite data will make it harder to track the rapid changes taking place at both poles.
Researchers around the globe were told last week the US Department of Defence will stop processing and providing the data, used in studies on the state of Arctic and Antarctic sea ice, at the end of this month.
Tracking the state of sea ice is crucial for scientists to understand how global heating is affecting the planet.
Sea ice reflects the sun's energy back out to space but, as long-term losses have been recorded, more of the planet's ocean is exposed to the sun's energy, causing more heating.
The National Snow and Ice Data Center, based at the University of Colorado, maintains a Sea Ice Index used around the world to track in near real-time the extent of sea ice around the globe.
In two updates in the past week, the centre said the US government's Department of Defence, which owns the satellites that contain onboard instruments used to track sea ice, would stop 'processing and delivering' the data on 31 July.
The US Department of Defense's decision to halt sharing of critical sea ice data "couldn't come at a worse time," according to researchers.
Climate scientists have been warning that Trump administration cuts have targeted climate functions across government, and there has been fears the sea ice data could be targeted.
The news comes as new research, some of which relied on the data, found that record low amounts of sea ice around Antarctica in recent years had seen more icebergs splintering off the continent's ice shelves in a process scientists warned could push up global sea levels faster than current modelling has predicted.
Dr Alex Fraser, a co-author of the research at the Australian Antarctic Program Partnership (AAPP), said NSIDC's sea ice data was 'our number one heart rate monitor' for the state of the planet's ice.
'It's our early warning system and tells us if the patient is about to flatline. We need this data and now [the scientific community] will be forced to put together a record from a different instrument. We won't have that continued context that we have had previously.'
NSIDC has said it is working with alternative and higher-resolution instruments from a different satellite, but has warned that data may not be directly comparable with the current instruments.
Fraser said: 'We are seeing records now year on year in Antarctica, so from that perspective this could not have come at a worse time.'
Dr Walt Meier, a senior scientist at NSIDC, said there were other 'passive microwave instruments' that could keep the long-term record going, but he said differences with older sensors created a 'a challenge to make the long-term record consistent and there will be some degradation in the consistency of the long-term record.'
'I think we will end up with a robust and quality record that users can have confidence in,' Meier said, but said this would add to uncertainty to estimates of trends.
Asked why the government was stopping the data, he said because 'everything is old and resources are limited, my guess is that it is not worth the time and effort to upgrade the systems for such old sensors, which may fail at any time.'
The research, published in the journal PNAS Nexus, found a link between increasing numbers of icebergs calving from floating ice shelves and the loss of sea ice.
While the loss of sea ice does not directly raise sea levels, the research said it exposed more ice shelves to wave action, causing them to break apart and release icebergs faster.
Glaciologist Dr Sue Cook, also from AAPP, said 'like a cork in a bottle' those shelves help to slow down the advance of land-based ice that does raise sea levels if it breaks off into the ocean.
She said the higher rates of iceberg calving seen in Antarctica were not accounted for in calculations of how quickly the ice sheet might break apart and contribute global sea levels.
'If we shift to this state where summer sea ice is very low but we continue using models based on previous periods, then we will definitely underestimate how quickly Antarctica will contribute to sea level rise,' she said.
The study also outlined other knock-on effects from the record low sea ice levels in the Antarctic, including the loss of more seals and penguins if trends continued.
As many as 7,000 emperor penguin chicks died in late 2022 after the early break-up of the stable ice they used for shelter while they grow their waterproof plumage.
A US Navy spokesperson confirmed the data processing from its defence meteorological satellite program (DMSP) would stop on 31 July 'in accordance with Department of Defense policy.'
DMSP is a joint program owned by the US Space Force, the spokesperson said, and was scheduled for discontinuation in September 2026.
'The Navy is discontinuing contributions to DMSP given the program no longer meets our information technology modernization requirements.'
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