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Research published in 2026 shows that the heat of the Southern Ocean approached Antarctica, putting ice shelves on alert.
On April 28, 2026, a study led by the University of Cambridge revealed a worrying signal in the Southern Ocean: the warm water from the deep ocean is approaching Antarctica.
The discovery indicates that the so-called circumpolar deep water has advanced towards the Antarctic continental shelf over the past two decades.
This movement could increase the melting of glaciers from below, precisely where the ice meets the ocean.
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The research was published in the journal Communications Earth & Environment and also involved scientists from the University of California, the Scripps Institution of Oceanography, and UCLA.
Warm deep ocean water approached Antarctica in the last two decades
The study analyzed ocean data accumulated over decades. With this, the researchers identified that the deep heat did not remain stable.
On the contrary, it moved southward, approaching the frozen edges of Antarctica.
This advance drew attention because the circumpolar deep water is warmer than the water masses near the continent.
Thus, when this water reaches the ice shelves, it can accelerate melting from the base.
Why circumpolar deep water concerns scientists
Circumpolar deep water circulates around Antarctica and carries heat in deeper layers of the ocean.
However, when this water mass approaches the continental shelf, the risk increases.
This happens because the Antarctic ice shelves act as natural barriers.
They hold back glaciers and ice sheets located in the interior of the continent.
Therefore, if these structures are weakened, the land ice can flow more easily into the sea.
Antarctic glaciers help control global sea level
The study’s alert is linked to Antarctica’s role in the planet’s balance.
The glaciers and ice sheets of the continent store a gigantic volume of frozen water.
According to researchers, if all this ice were lost, there would be enough water to raise the global sea level by about 58 meters.
This number does not mean that this will happen all at once.
Still, it shows the importance of ice shelves for climate and oceanic stability.
How scientists discovered the advance of deep heat
For many years, the Southern Ocean was difficult to monitor. After all, the region is remote, cold, and marked by extreme conditions.
Therefore, researchers combined different data sources.
Data from scientific ships, oceanic measurements, and information from autonomous buoys of the Argo program were used.
The team applied machine learning techniques to reconstruct monthly records since 2004.
In this way, it was possible to observe more precisely the advance of warm water towards Antarctica.
Southern Ocean has a central role in Earth’s climate
The Southern Ocean does not only influence Antarctica.
In fact, it helps regulate the storage of heat, carbon, and nutrients on a global scale.
The oceans absorb more than 90% of the excess heat associated with global warming.
Therefore, changes in the distribution of this heat can have broad effects on the climate system.
Study confirms trend previously predicted by climate models
Before this research, climate models already indicated that deep heat could shift towards Antarctica.
Now, however, scientists have observed this pattern directly in the data.
According to Joshua Lanham, the lead author of the study, the discovery shows that the change is already happening.
The phenomenon is not just a future hypothesis.
It already appears in the measurements of the Southern Ocean.
Advance of warm water reinforces alert about the future of glaciers
The discovery does not claim that all Antarctic glaciers will collapse immediately.
However, it reinforces an important alert.
The approach of warm water can increase the vulnerability of ice shelves.
Melting from the base can gain strength in sensitive areas of the continent.
Thus, Antarctica returns to the center of discussions on climate change, oceans, and sea level.
The study shows that the heat stored in the depths of the ocean is already moving.
And now, this movement is occurring increasingly closer to one of the most important regions for Earth’s climate balance.
