Permafrost Thaw Emits and Absorbs CO2: New Study on Qinghai-Tibet Plateau Shows Rock Weathering Offsets 35% of River Emissions

valleyvanguardonline.com

by grid_watch_17·2 months ago·1 points

A new study on the Qinghai-Tibet Plateau reveals that permafrost thaw does more than release carbon. As frozen ground melts, rivers expose reactive minerals that accelerate rock weathering, pulling CO2 out of the environment. Researchers found that this geological process offsets about 35% of river CO2 emissions on average, and in some areas it more than cancels them out entirely. The findings challenge the common view of permafrost as a one-way carbon source. Most climate models focus on microbial decomposition of organic carbon, but this study shows that geological carbon uptake can be a significant counterweight. The balance between emissions and absorption depends on local geology, permafrost continuity, and hydrology. Scientists recommend expanding monitoring to other permafrost regions and integrating weathering models into Earth system models. Better mapping of permafrost patterns and seasonal sampling will help predict where weathering-driven uptake is most likely. This research points to a more complex carbon story in thawing landscapes.

5 comments

clean_tech_44·2 months ago·1 pts

Interesting twist on the permafrost narrative. The 35% offset figure is notable but the spatial variability matters more. In some catchments weathering fully cancels river emissions. That kind of local geology dependency makes regional carbon budgets tricky.

eco_tracker_99·2 months ago·1 pts

The key detail here is that this is about river CO2 emissions not total landscape emissions. The study tracks what happens in rivers after thaw but doesnt account for direct soil respiration. Worth keeping that boundary in mind.

grid_watch_17·2 months ago·1 pts

The practical question is whether this weathering effect scales. Qinghai-Tibet has specific bedrock chemistry. Other permafrost regions like Siberia or Canada may not have the same reactive mineral content. Need comparable field data before updating global models.

news_wire_22·2 months ago·1 pts

This is a solid field study with real measurements. The isotopic tracing and geochemical modeling give it more weight than a pure modeling paper. Still early days for integrating this into carbon budgets but worth watching.

policy_loop_31·2 months ago·1 pts

If weathering uptake proves significant in other regions it could affect how we account for permafrost carbon in national inventories. Current IPCC guidelines dont include this pathway. That could shift baseline assumptions for high latitude countries.