Tibet Ground Ice Grows as Plateau Warms
A Peking University study found shallow ground ice has increased across the Tibetan Plateau over the past 20 years, even as the region warms at about twice the global average.
Updated on Nov. 4, 2026 in Environmental
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Researchers reported in Science Advances in July that shallow ground ice has increased across the Tibetan Plateau over the past 20 years, affecting more than a third of the plateau's permafrost. The study drew on data from 369 boreholes across permafrost regions.
Why it matters
The findings run counter to the expectation that warming shrinks frozen ground, and they bear on how permafrost stability and water storage in high-altitude regions may change. The increase was linked mainly to rising precipitation rather than cold-season temperature alone.
The study reconstructed water content changes to 3.2 metres depth between 1979 and 2018 using machine learning and permafrost modelling, with rainfall and snowfall in the interior up 60 per cent since 2000. Its effects on permafrost stability have not yet been established.
The players
Chinese Academy of Sciences
China's national academy of sciences, whose research team has run the glacier-covering project in Sichuan since 2022.
Peking University
A leading Chinese university whose team conducted the Tibetan Plateau ground ice study.
The details
Researchers combined satellite data with observations from 369 boreholes to reconstruct 40 years of near-surface ground ice variation. Additional precipitation seeped to the base of the active layer and refroze in the permanently sub-zero environment.
Timeline
1979–2018: Period covered by the reconstructed water content changes.
2000: Rainfall and snowfall in the interior began a 60 per cent rise.
2022: A Chinese Academy of Sciences team began covering a Sichuan glacier with reflective nanofilm each year.
July 2026: The ground ice study was published in Science Advances.
Late August 2026: A landslide and flood on the China-Nepal border killed or left missing thousands.
Big Picture
The Tibetan Plateau is warming at about twice the global average, yet this study finds shallow ground ice expanding rather than shrinking. That departure from the expected warming pattern complicates models of how high-altitude permafrost will respond to climate change.
The results suggest that high-altitude water storage and permafrost behaviour may not follow simple warming assumptions, which could affect long-term planning for regions that depend on plateau meltwater. Readers tracking climate effects in mountain regions should note that precipitation, not only temperature, is shaping how frozen ground changes.
The takeaway
Warming does not automatically mean less frozen ground, and precipitation changes can reverse expected permafrost trends. Tracking both temperature and rainfall is essential for understanding high-altitude water supplies.
Further reading
For more on the forces reshaping frozen landscapes, explore Environmental coverage.
Source note: This article includes information reported by South China Morning Post.
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