Topic
Zero-curtain dynamics, microbial activity near freezing, and the release of stored organic carbon from thawing Arctic ground.
Özpolat and colleagues found hillslope erosion 2 to 3 times more intense under discontinuous permafrost, using cores from 12 Alaska lakes. The cores come from landscapes near their present state, and the authors say the gap may be site-specific.
Reality
Two studies project that carbon leaking from thawing Arctic permafrost will add about a quarter degree Celsius of warming by 2100, beyond fossil fuels. Permafrost researchers Sue Natali and Gustaf Hugelius said the UN's 2.6C outlook for the century leaves that extra out.
Reality
Civil engineers are developing drone-carried electromagnetic surveys to find thawed permafrost in Alaska, where thaw damage could reach $51 billion. The surveys show crews where to look closely before drilling, though their depth estimates are still uncertain.
Reality
A paper in Environmental Research Letters estimates that permafrost, wildfire, wetland and inland-water emissions amplify human-caused warming by 20 to 30 percent, though at one standard deviation the low-emissions case still runs from zero to 0.4 C.
Reality
Satellite and seismic analyses point to ice that snapped off above 5,000 metres, blocked the Lhende Khola and burst through hours later. Almost no rain preceded it, which is why the region's flood warning tools had nothing to read.
Perspective Coverage
6 publishersReality
A NASA-led AI mapping effort puts Arctic-wide extent on the weeks-long near-freezing window when soil microbes keep breathing. Spring windows run longer than autumn ones. No flux number is attached yet.
Reality