Permafrost, or frozen soil, is rapidly collapsing across a 52,000 square mile area in northwest Canada – about the size of the entire state of Alabama. New research from the Northwest Territories Geological Survey (NTGS) finds the permafrost thaw is intensifying, a dramatic disintegration that could speed up climate change.
When these slabs of Arctic permafrost collapse, they send silt and mud rich in carbon into waterways. The research shows the decay is resulting in landslides that could alter large swaths of landscape. Similar phenomenon have been noted in Scandinavia, Siberia, and Alaska. The new study sought to measure permafrost decay in Canada using satellite images and other data – and Steven Kokelj of NTGS, lead author of a paper published in February by Geology, said “things have really taken off” in the face of climate change. Scientists from universities in New Zealand and Canada also contributed to the research.
The scientists observed permafrost disintegrating in 40- to 60-mile stretches of the terrain, revealing “extensive landscapes [that] remain poised for climate-driven change.” Other research has suggested thawing permafrost could lead to the collapse of coastlines or creation of new lakes or valleys.
All that silt and mud could affect fish and other species living in the waterways, limiting development of aquatic plants, but scientists still need to determine how exactly this added mud might impact fish. Also up for debate is how quickly the carbon in melted permafrost becomes carbon dioxide (CO2). Scientist Suzanne Tank of the University of Alberta told InsideClimate News the carbon in permafrost becomes coarse particles that don’t become CO2 right away. But Swedish researchers conducted a study suggesting soil particles are in fact converted rapidly to CO2 when the soil is carried along to the sea.
by Lacy Cooke