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Lyco

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  • @lyco
    Lyco @lyco 31/05/2017
    3
    @kassem
    @sinehebdo
    @biggrizzly
    3

    Add Nitrous Oxide to the List of Permafrost Melt Concerns
    ▻http://www.climatecentral.org/news/nitrous-oxide-permafrost-melt-21491

    Melting #permafrost is among the biggest #climate change issues. That’s because it contains billions of tons of carbon that, if it melts, will be released in the form of carbon dioxide and methane, an even more potent greenhouse gas.

    Less studied is what happens to the 67 billion tons of nitrogen stored in the currently frozen soil. New research shows that a permafrost meltdown could cause that nitrogen to be released as nitrous oxide, a greenhouse gas that’s nearly 300 times more powerful than carbon dioxide. That would crank up the planetary heat even further, and with it, the risks posed by sea level rise, increasingly extreme weather, and other climate change impacts.

    #arctique

    Lyco @lyco
    • @sinehebdo
      Dror@sinehebdo @sinehebdo 31/05/2017

      à ajouter aux compilations :
      ►https://seenthis.net/messages/524060
      ►https://seenthis.net/messages/499739

      #effondrement #collapsologie #catastrophe #fin_du_monde #it_has_begun #Anthropocène #capitalocène
      #réchauffement_climatique #dérèglement_climatique

      Dror@sinehebdo @sinehebdo
    • @lyco
      Lyco @lyco 21/06/2019

      No laughing matter
      ▻https://news.harvard.edu/gazette/story/2019/06/harvard-chemist-permafrost-n2o-levels-12-times-higher-than-expected

      a paper published this month in the journal Atmospheric Chemistry and Physics shows that nitrous oxide emissions from thawing Alaskan permafrost are about 12 times higher than previously assumed.

      [...] In just one month, the plane had recorded enough nitrous oxide to fulfill the expected cap for an entire year. Though the Anderson data represented just 193 of the 5.5 million square miles of the Arctic — like using a Rhode Island–sized plot to represent the entire United States — “it was 10 million times larger than any previous study looking at permafrost N2O emissions,” said Wilkerson. “It makes [previous] findings quite a bit more serious.”

      Wilkerson hopes this new analysis will inspire further research. “We don’t know how much more it’s going to increase,” he said, “and we didn’t know it was significant at all because the other studies were on such a small spatial scale that we didn’t know whether they were representative of the larger region.”

      Lyco @lyco
    • @sinehebdo
      Dror@sinehebdo @sinehebdo 21/06/2019

      Article original :

      Permafrost nitrous oxide emissions observed on a landscape scale using the airborne eddy-covariance method
      Jordan Wilkerson, Ronald Dobosy, David S. Sayres, Claire Healy, Edward Dumas, Bruce Baker, and James G. Anderson
      Atmos. Chem. Phys., 19:4257-4268 (2019)
      ▻https://doi.org/10.5194/acp-19-4257-2019

      Ajouté à la troisième compilation :
      ►https://seenthis.net/messages/680147

      Dror@sinehebdo @sinehebdo
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thèmes

  • #arctique
  • #climate
  • #permafrost
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