Rock Weathering Offsets 35% of Qinghai-Tibet Permafrost River CO2 Emissions
Updated
Updated · Nature.com · Jun 17
Rock Weathering Offsets 35% of Qinghai-Tibet Permafrost River CO2 Emissions
2 articles · Updated · Nature.com · Jun 17
Summary
A Qinghai-Tibet Plateau study found net CO2 drawdown from rock weathering equals about 35% of river CO2 emissions triggered by permafrost thaw, and can exceed 100% in catchments with discontinuous or isolated permafrost.
Data from 50 rivers sampled over more than three years showed river CO2 emissions decline as permafrost cover decreases, while solute fluxes from chemical weathering rise along the thaw gradient.
Researchers estimated total riverine CO2 emissions at 2.3 TgC a year across the study area, versus 0.80 TgC of net CO2 consumption from weathering after accounting for sulfide-driven CO2 production.
The rivers still carry substantial ancient carbon from thawing permafrost and rocks, but the findings suggest warming can strengthen geological CO2 uptake on decadal-to-centennial timescales.
The study argues carbon-cycle models should track both biological emissions and inorganic weathering sinks to gauge the net climate impact of permafrost thaw.
As Tibet's permafrost thaws, will its rivers' carbon capture outweigh the carbon released from its land and lakes?
Could humanity replicate Tibet's natural carbon capture by spreading crushed rock in other rapidly warming regions?
Are current climate models wrong about the Arctic's net impact on warming by overlooking this powerful weathering effect?
Natural Rock Weathering Significantly Offsets Permafrost Carbon Emissions on the Qinghai-Tibet Plateau: Impacts for Climate Models and Policy
Overview
New research published in June 2026 reveals that thawing permafrost on the Qinghai-Tibet Plateau exposes fresh rock surfaces, which accelerates rock weathering. This intensified weathering acts as a crucial carbon sink by consuming atmospheric carbon dioxide. As CO2 dissolves in water to form carbonic acid, it reacts with rocks, locking away carbon in minerals. This natural process offers a new perspective on how Earth's systems can partially counteract greenhouse gas emissions from thawing permafrost, highlighting an important balance between carbon release and uptake in changing climates.