
Parts of the Tibetan Plateau’s near- surface permafrost (frozen ground) have been gaining ground ice since around 2000, despite regional warming, due to increased precipitation driven by stronger westerly winds.
This comes from a July 2026 study in Science Advances titled “Westerly induced precipitation increases drives near- surface ground ice gain on the Tibetan Plateau despite warming,” led by Yi Zhao and Dongfeng Li (Peking University) with co- authors including Jan Nitzbon (Alfred Wegener Institute) and others.
Key findings
- Across roughly 35% of the plateau’s permafrost area (mainly the interior, westerly- influenced regions), near- surface ground ice (frozen water content or FWC in the soil pores) has increased at the base of the active layer (the seasonally thawing top layer, typically ~1.4– 3.2 m depth). The southeastern monsoon- dominated areas show the expected ice loss.
- Evidence includes:
- Borehole data from 369 sites (194 pre- 2000, 175 post- 2000): older holes averaged ~16% ice by volume; newer ones ~25%. Paired nearby boreholes drilled years apart consistently showed higher ice in the later samples, concentrated at the active- layer base.
- A physics- based permafrost model (SHAW) driven by climate data (1979–2018), validated against the boreholes and supported by satellite InSAR ground- deformation data.
- Model estimates: westerly- fed regions gained ~144 km³ (~35 cubic miles) of ice in the top ~3.2 m between 1979 and 2018; monsoon areas lost less; net plateau- wide gain ~98 km³.
Why this happens despite warming
The Tibetan Plateau is warming roughly twice as fast as the global average, which would normally promote thaw and ice loss. However, strengthened westerlies have increased annual precipitation in the interior by about 60% after 2000 (from ~227.5 mm to ~364.8 mm), bringing extra moisture from the Mediterranean/Iran region.
Extra rain and snowmelt infiltrate the thawed active layer in summer, reach the cold base (near or below 0 °C year- round), and refreeze there. Near- surface ice still melts seasonally. Model experiments isolating variables confirmed precipitation increase as the dominant driver: holding precipitation at pre-2000 levels produced ice loss under observed warming, while holding temperature steady and allowing precipitation to rise produced even faster ice gain.
This is analogous to the “Karakoram anomaly”, where some nearby glaciers have held or gained mass due to increased snowfall from similar circulation changes.
Implications
- Accumulated ice amplifies seasonal freeze- thaw heave and settlement (InSAR shows higher deformation rates, ~18 mm/year vs. ~14 mm/year elsewhere), which can destabilize landscapes, infrastructure (roads, buildings), and increase erosion or sediment delivery to rivers.
- The ice gain may be temporary; in some modeled areas it slowed or reversed as thaw deepened. Long- term projections still indicate substantial permafrost degradation later this century.
- The study highlights that rapid precipitation changes can locally outweigh temperature effects on cryosphere evolution.
Note: The provided attribution (Ahsan Tanveer, Akaash Babar, Peking University) does not match the paper’s authors; Tanveer is a robotics researcher at PKU, so this may refer to a news summary or secondary piece. The primary research is the Science Advances paper by Zhao, Li et al.

The Karakoram anomaly (also called the Karakoram glacier anomaly) refers to the unusual behavior of glaciers in the Karakoram Range, where they have remained roughly stable or shown slight mass gains (and sometimes advances or increased surge activity) over recent decades, while most mountain glaciers worldwide, including those elsewhere in High Mountain Asia (the Himalayas, etc.), have been losing mass and retreating due to climate warming.
Key details
- Location: The Karakoram is a high mountain range straddling parts of Pakistan, India, China, Afghanistan, and Tajikistan. It contains some of the world’s tallest peaks (including K2) and one of the largest concentrations of glaciers outside the polar regions (thousands of glaciers covering more than 20,000 km²).
- Observations: Noted from the 1990s onward (formally named by glaciologist Kenneth Hewitt around 2005), remote sensing, geodetic measurements, and field data showed balanced to slightly positive mass budgets, stable or advancing termini in places, increased ice- flow speeds in some cases, and widespread surging. Similar (though weaker or shifting) behavior has been observed in nearby areas such as the Western Kunlun and parts of the Pamir (sometimes called the broader Pamir- Karakoram anomaly).
- Contrast: Globally, glaciers outside Greenland and Antarctica lost substantial mass (on the order of hundreds of kg m⁻² per year on average in recent decades). Most of High Mountain Asia followed this pattern of retreat and mass loss.
Main explanations
The leading drivers involve regional meteorology rather than (or in addition to) local factors like heavy debris cover on glaciers or steep topography and avalanche feeding:
- Strengthened or shifted westerly winds (mid-latitude circulation) delivering more winter snowfall and moisture from the Mediterranean, Caspian, or North Atlantic regions.
- Related changes such as increased precipitation intensity, possible summer cooling or reduced melt energy (via cloud cover, albedo, or other factors), and interactions with the region’s extreme topography.
A 2020 review in Nature Geoscience summarized complementary meteorological and process explanations but noted that understanding remains incomplete.
Recent status and outlook
More recent studies (into the 2020s) indicate the anomaly has weakened or shifted. Some analyses show near- equilibrium overall for Karakoram glaciers over ~2000– 2023 but with emerging mass deficits in parts (e.g., recent years or eastern sectors), a westward migration of the stable and gain core, and clearer losses in adjacent ranges like the Pamir. Temperature rise is increasingly dominant, and long- term persistence is considered unlikely under projected continued warming.
This phenomenon was referenced in the recent Tibetan Plateau permafrost study as a parallel example of localized cryospheric ice gain (or stability) driven by precipitation changes outweighing warming effects in specific High Mountain Asia settings.

Westerly induced precipitation increase drives near-surface ground ice gain on the Tibetan Plateau despite warming
Abstract (key points)
Near- surface ground ice loss is typically a key sign of permafrost degradation under global warming, affecting ground stability and carbon feedback. However, field evidence shows ground ice can locally accumulate.
Using borehole ground- ice observations, a physics- based permafrost model (SHAW), and satellite- based ground deformation (InSAR) data, the authors identify an anomalous increase in ice at the bottom of the active layer across the interior Tibetan Plateau. This affects about 35% of the plateau’s permafrost area, despite ongoing climate warming.
Mechanism: Strengthened mid- latitude westerlies have increased precipitation (by ~60% after 2000 in the affected regions), supplying extra soil moisture that infiltrates the seasonally thawed active layer and refreezes at its cold base.
The freeze- thaw cycles linked to this accumulated ice amplify ground deformation, which can destabilize landscapes and infrastructure.
The authors note this as a divergent cryospheric response (local ice gain) against the global trend of ice loss, paralleling the Karakoram glacier anomaly, and highlight that rapid precipitation increases can locally outweigh temperature effects in driving cryosphere changes on the Tibetan Plateau.
Additional highlights from the paper and coverage
- Borehole data (369 sites): higher ice content post-2000, especially at 1.4–3.2 m depth.
- Model results (1979– 2018): net ground- ice gain of ~+98 km³ across the plateau’s permafrost (gains of ~+144 km³ in westerly regions offsetting losses of ~–46.5 km³ in monsoon regions).
- Scenario experiments confirmed precipitation (wetting) as the dominant driver over warming.
- Implications for infrastructure stability and regional hydrology.
The full paper (including figures, methods, and supplementary materials) is available at the link you provided.
Journal: Science Advances, (Vol. 12, Issue 30), open- access paper
Provided: Peking University
Published: 23 Jul 2026
Authors: Yi Zhao, Dongfeng Li, Jan Nitzbon, Zhuotong Nan, Yuqi Song, Xie Hu, Youhua Ran, Shang Tian, Rui Deng, Yingzhong Luo, and Yiyi Li












You must be logged in to post a comment.