Permafrost—ground that remains frozen year-round—is capped by a few feet of dirt and plant detritus. Called the active layer, this soil normally thaws each summer and refreezes in winter ...

Core samples had been taken from just the top three metres of permafrost. The study instead analysed mercury in sediments in riverbanks and sandbars, tapping into deeper soil layers. It found that ...

For the SSP126 scenario that limits warming to 2.0°C, the model determined that permafrost degradation would make 119 Gt of carbon available for decomposition by 2100 from soil that was ...

“It’s fast and dramatic, affecting landscapes in unprecedented ways,” Turetsky said. Permafrost, a perpetually frozen layer under the ground surface, contains rocks, soil, sand and, in some cases, ...

Lachenbruch was an expert in permafrost, the rock-like layer of frozen soil just below the thin, insulated cover of soil and vegetation. In December 1970, he released a study in which he explained ...