UK Scientists Warn of Accelerating Arctic Glacier Thinning After Summer Survey Voyage

ARTICLE:

30 October 2026

This summer, UK scientists carried out one of the most ambitious polar science expeditions ever attempted, sending a fleet of robots to study how Greenland's glaciers interact with the ocean. And the results are stark: Arctic glacier thinning is accelerating.

The 30-day GIANT project expedition, led by the British Antarctic Survey, worked in a remote fjord in East Greenland. Researchers deployed instruments 523 times, producing 30 glacier face maps matched by simultaneous drone maps. A remotely piloted craft inserted sensors directly into the glacier face, taking measurements for 19 hours, collecting data millimetres from the ice.

The observations from this expedition... confirm that the Greenland glaciers are thinning more rapidly in current warming conditions, the BAS reported. Instruments revealed complex melt processes at the glacier outlets where ice, ocean and atmosphere meet.

Greenland's glaciers meet a warming ocean, and current climate models struggle to accurately capture these interactions. BAS says global models cannot accurately simulate the carriers of warm water to the ice fronts and so miss key sources of melting.

Greenland is home to the world's second largest ice sheet, containing enough ice to raise global sea levels by 7.4 metres if it melted entirely. But the new data reveals complex melt processes and accelerating changes.

The latest findings echo earlier observations. In 2015, researchers using satellite sensors reported that an Arctic ice cap in Austfonna had thinned by a third in 3-4 years, accelerating to 25 times its original flow rate.

And in Svalbard to Greenland's east, a 2025 study reported a record melt season caused pan-Svalbard mass loss of 61.7 ± 11.1 Gt of ice, contributing 0.27 ± 0.06 mm to sea level. That was part of a single-year loss of 102.1 ± 22.9 Gt of ice from the glaciers around the Barents Sea.

Between 2010 and 2023, the Greenland Ice Sheet thinned by 1.2 m on average, and the ablation zone thinned by 6.4 m. That comes on top of rapid changes in Austfonna and Svalbard.

At Norsesundet, one of Greenland's fastest-flowing and fastest-thinning glaciers, the 2026 study observed a 130% increase in melt over two years. The height of the glacier face dropped by 85m.

What does this mean? Rapid melting around Greenland and Svalbard adds to sea level rise. Fresh melting water is changing coastal currents and marine ecosystems around the North Atlantic rim. Warming ocean currents may be accelerating glacier melting and calving - but understanding the two-way interaction remains a key challenge in climate science.

Over the next year, the GIANT project researchers will use the data to improve models of glacier-ocean interaction and project sea level change. Process studies like this one are the key to building better models, and ultimately to predicting the effects of sea level rise. But Arctic researchers stress that the key to future melting lies in cutting greenhouse gas emissions.

Community monitoring and local knowledge also have a crucial role to play. A new project, PAME, brings together competing interests to deliver large-scale community monitoring, using citizen science on the ground and citizen space observation from orbit. On the ground, community observers have witnessed concerning trends in snow water equivalent and snow-free date that satellite sensors can't measure, building a more complete picture. As glaciers retreat and more bare earth is exposed, glacier lagoons are expanding, disrupting local communities as they do.