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Cave deposits show surprising shift in permafrost over last 400,000 years

Massachusetts Institute of Technology
Nearly one quarter of the land in the Northern Hemisphere, amounting to some 9 million square miles, is layered with permafrost – soil, sediment, and rocks that are frozen solid for years at a time. Vast stretches of permafrost can be found in Alaska, Siberia, and the Canadian Arctic, where persistently freezing temperatures have kept carbon, in the form of decayed bits of plants and animals, locked in the ground.
Scientists estimate that more than 1,400 gigatons of carbon is trapped in the Earth’s permafrost. As global temperatures climb, and permafrost thaws, this frozen reservoir could potentially escape into the atmosphere as carbon dioxide and methane, significantly amplifying climate change. However, little is known about permafrost’s stability, today or in the past. ....

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Cave deposits show surprising shift in permafrost over the last 400,000 years

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Earth’s permafrost shifted to a more stable state in the last 400,000 years and has been less susceptible to thawing since then, according to a new study by MIT researchers and their colleagues, who are pictured here on a research expedition. ....

Northwest Territories , Nahanni National Park , United States , Alberto Reyes , Nicole Biller Celander , Jeremy Shakun , Bernard Lauriol , David Mcgee , National Sciences , University Of Alberta , Department Of Earth , Engineering Research Council Of Canada , National Science Foundation , Planetary Sciences , Polar Continental Shelf Program , University Of Ottawa , Derek Ford At Mcmaster University , Corinne Wong At Boston College , Oxford University , Boston College , Northern Hemisphere , Canadian Arctic , Science Advances , Ben Hardt , Irit Tal , Corinne Wong ,

Cave deposits show surprising shift in permafrost over the last 400,000 years

Cave deposits show surprising shift in permafrost over the last 400,000 years
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