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Experts warn climate crisis may destabilise mountain glaciers

scienceAug 28, 202637924

Satellite imagery and seismic analysis indicate a glacier collapse high on Langtang Lirung triggered the flash flood that tore along the Bhotekoshi River, sweeping away buildings and roads and killing at least 360 people with 1,400 missing. The US Geological Survey said long-period seismic waves show the impact of the falling ice registered about magnitude 5.2, revising an initial magnitude 4.4 quake attribution. The International Centre for Integrated Mountain Development reported river levels downstream rose 7 to 9 metres within 30 minutes after boulders and debris were pushed into the Lhende Khola tributary. Glaciologists say unusually high temperatures this year likely melted ice that bound fractured bedrock, weakening snowpacks and filling crevasses with water; Dr Hamish Pritchard of the British Antarctic Survey noted ground temperatures two days before the collapse reached their highest point in two years. Scientists point to a pattern of warming in alpine and polar regions, with the Intergovernmental Panel on Climate Change warning in its 2023 synthesis report that every increment of warming will multiply hazards from glaciers and permafrost. Researchers and regional experts say melting and thawing permafrost make mountain slopes and ice more unstable, increasing future risks of floods, landslides and avalanches and underscoring calls for improved early warning systems for downstream communities.

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