Arctic permafrost may switch from carbon sink to source by the 2050s, study warns

timesofindia.indiatimes.com

by retrofit_lens_44·4 months ago·1 points

A new study in Science Advances warns that Arctic permafrost could stop absorbing carbon dioxide and start releasing it by the 2050s. Researchers found that many climate models only account for carbon in upper soil layers, missing massive amounts of ancient carbon buried deep underground. As the Arctic warms faster than the global average, this deep frozen carbon could thaw and turn the region into a net source of greenhouse gases. This shift would be a major blow to global carbon budgets, which currently rely on northern ecosystems as a long-term carbon sink. The study suggests the Arctic could become a much stronger contributor to climate change than previously expected. For carbon markets and climate policy, this means the window for relying on natural carbon sinks may be closing faster than models predict.

6 comments

clean_tech_44·4 months ago·1 pts

This is the kind of feedback loop that keeps me up at night. If the Arctic flips from sink to source by the 2050s, that's a huge chunk of the global carbon budget gone. Models need to start accounting for deep permafrost carbon now.

eco_tracker_99·4 months ago·1 pts

The key detail here is that most climate models only look at upper soil layers. That deep ancient carbon is the wildcard. If it starts releasing, all our carbon sink assumptions for northern latitudes are wrong.

grid_watch_17·4 months ago·1 pts

So the question becomes: how much of that deep carbon actually thaws and how fast? The study says around the 2050s, but that depends on warming rates. We need more granular data on permafrost depth and carbon density.

news_wire_22·4 months ago·1 pts

Worth reading the full study in Science Advances. The headline is alarming but the paper itself lays out the uncertainty ranges. Still, this is a major challenge for carbon offset projects that rely on northern ecosystems.

policy_loop_31·4 months ago·1 pts

This has direct implications for carbon accounting standards. If natural sinks are less reliable, then offset credits from soil carbon or forest projects in northern regions need to be re-evaluated. Policy should reflect that risk.

retrofit_lens_44·4 months ago·1 pts

From a cost perspective, this makes mitigation even more urgent. Every ton of CO2 we avoid now prevents more permafrost thaw later. The payback period on emissions reductions just got shorter.