> ## Content Index
> Fetch the complete content index at: https://www.theglobalvoice.com/llms.txt
> Use this file to discover other available public pages before exploring further.

# New Ice-Cliff Evidence Could Improve Predictions of Rising Seas
- URL: https://www.theglobalvoice.com/new-ice-cliff-evidence-could-improve-predictions-of-rising-seas/
- Published: 2026-10-19T09:29:43.000Z
- Updated: 2026-10-19T10:18:10.000Z
- Description: An analysis of 15,330 ice-cliff observations has revealed a paradox: towering glaciers can break apart faster than predicted, yet their retreat often stops. The findings challenge a disputed theory of runaway ice-sheet collapse and could improve forecasts of future sea-level rise.
- Author: TGV Desk
- Tags: Antarctica, Greenland, Glaciers, Climate Change, Sea-Level Rise, Climate Research, Ice Sheets, Marine Ice-Cliff Instability, Discovery, has-audio

An ice cliff rising more than 100 metres above the ocean should, according to a longstanding scientific hypothesis, be dangerously unstable. Its own weight can cause enormous sections to fracture and fall into the sea. As the glacier retreats, another towering wall of ice may emerge, collapse and expose the next. In theory, this sequence could continue, driving rapid ice loss from Greenland and Antarctica.

But what happens when a collapsing glacier unexpectedly stops?

A [study published in ](https://doi.org/10.1126/science.aee0658?ref=theglobalvoice.com)[Science](https://doi.org/10.1126/science.aee0658?ref=theglobalvoice.com)[ on October 15, 2026](https://doi.org/10.1126/science.aee0658?ref=theglobalvoice.com) offers the most comprehensive observational examination yet of this question. Researchers analysed 15,330 satellite observations of ice cliffs around Earth's major ice sheets and discovered that, although tall cliffs can disintegrate remarkably quickly, their retreat often slows or stops as the surrounding conditions change.

The findings complicate a theory known as marine ice-cliff instability, or MICI, which has influenced some of the more severe projections of future sea-level rise.

The hypothesis emerged from a troubling possibility: as warming oceans erode the floating ice shelves that help restrain glaciers, they may expose cliffs too tall to support their own weight. If those cliffs fail repeatedly, enormous volumes of land-based ice could eventually enter the ocean.

Until now, however, scientists had relatively little observational evidence to establish whether such collapse would become self-sustaining.

Caroline Needell, a doctoral researcher in the MIT–Woods Hole Oceanographic Institution Joint Program, investigated this uncertainty alongside Catherine Walker of Woods Hole and Jeremy Bassis of the University of Michigan.

Using measurements from NASA's [ICESat-2 satellite](https://icesat-2.gsfc.nasa.gov/?ref=theglobalvoice.com), the researchers examined ice-cliff heights, fractures, surrounding water depths and rates of iceberg formation. The satellite measures surface elevation through laser pulses, allowing scientists to track changes in glaciers across otherwise inaccessible polar regions.

The observations, collected between 2019 and 2023, revealed that most ice cliffs were considerably shorter than the height at which runaway collapse has been proposed to occur. The average was approximately 30 metres, although several cliffs exceeded 100 metres.

The team then examined four Antarctic regions containing exceptionally tall cliffs, including one measuring 127 metres. Here, the results were particularly revealing.

These cliffs sometimes collapsed and retreated faster than existing models predicted. Yet the retreat did not continue indefinitely. Instead, the glaciers thinned, encountered changes in their underlying terrain or moved into conditions that made further collapse less likely.

Other stabilising influences emerged from the wider survey. Thick accumulations of broken ice and sea ice, known as mélange, could provide support near glacier fronts. Water depth also mattered because surrounding seawater exerts pressure against the ice.

---

The researchers' [institutional findings, published by Woods Hole Oceanographic Institution](https://www.whoi.edu/press-room/news-release/ice-survey/?ref=theglobalvoice.com), suggest that cliff height alone cannot reliably determine whether a glacier will experience sustained collapse. Ice thickness, bedrock topography and the speed at which ice thins must also be considered.

This does not mean that Antarctica is safe from accelerating ice loss. The study cannot establish how every glacier will behave under future warming, particularly if environmental conditions move beyond those observed by satellites.

Nor does it eliminate marine ice-cliff instability as a possibility. Instead, it provides evidence that some mechanisms driving rapid collapse are counteracted by processes that can restore stability.

For coastal populations, the implications extend far beyond the polar regions. Better predictions of ice-sheet behaviour are essential for estimating future flooding, erosion and storm-surge exposure.

The deepest uncertainty has never been simply whether the ice will break. It is whether, once the collapse begins, the glacier will find a way to stop.