US EditionArctic region was permafrost-free when global temperatures were 4.5˚C higher than today, study reveals
5 Articles
5 Articles
Permafrost in the Cretaceous supergreenhouse
Earth’s climate during the last 4.6 billion years has changed repeatedly between cold (icehouse) and warm (greenhouse) conditions. The hottest conditions (supergreenhouse) are widely assumed to have lacked an active cryosphere. Here we show that during the archetypal supergreenhouse Cretaceous Earth, an active cryosphere with permafrost existed in Chinese plateau deserts (astrochonological age ca. 132.49–132.17 Ma), and that a modern analogue fo…
Arctic region was permafrost-free when global temperatures were 4.5˚C higher than today, study reveals
Scientists have found evidence that the Asian continent was free of permafrost all the way to its northerly coast with the Arctic Ocean when Earth's average temperature was 4.5˚C warmer than today, suggesting that the whole Northern Hemisphere would have also been free of permafrost at the time.
Madrid, 4 Jul (EFE).- In the past, the Arctic was covered by a seasonal sea ice layer that allowed life even in the coldest periods of the last 750,000 years. The finding will help to understand how this ocean responded to climate change in the past and how it could do so in the future. For years, scientists have debated whether a gigantic thick ice platform once covered the entire Arctic Ocean during the coldest ice ices, but the new study ques…
Environmental News Network - Research Reveals Arctic Region Was Permafrost-Free When Global Temperatures Were 4.5˚C Higher Than Today
Scientists have found evidence that the Asian continent was free of permafrost all the way to its northerly coast with the Arctic Ocean when Earth’s average temperature was 4.5˚ C warmer than today, suggesting that the whole Northern Hemisphere would have also been free of permafrost at the time.
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