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Human Carbon Dioxide Emissions Reverse 2000 Years of Arctic Cooling

  1. Sep 8, 2009 #1
    http://www.ucar.edu/news/releases/2009/arctic2k.jsp [Broken]

    The associated albedo flip will amplify the warming.
     
    Last edited by a moderator: May 4, 2017
  2. jcsd
  3. Sep 10, 2009 #2
    One of the arguments against AGW causing problems is that the spectra where CO2 absorbs IR is saturated by water absorbing. This is not a problem with the arctic atmosphere. Its too dry.

    This is not the only source of Arctic amplificaiton but it is one of them.
     
  4. Sep 10, 2009 #3

    Xnn

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    attachment.php?attachmentid=20509&stc=1&d=1252598357.jpg

    So, while "Global Warming" did not offically start until about 1950, "Artic Warming" started far sooner.

    Could we call it around 1900?
     

    Attached Files:

  5. Sep 12, 2009 #4
    CO2 does not have an instantaneous effect. The reason CO2 has an effect on climate is due to the fact that it is a long lived greenhouse gas.
     
    Last edited: Sep 13, 2009
  6. Sep 29, 2009 #5

    Xnn

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    Currently the ongoing increase of CO2 in the atmosphere is contributing about 0.015C/year to average annual global temperatures. This value is so small that it is hardly noticeable.

    El Nino an La Nina on the other hand can swing global temperatures about 0.3C within a year or two. So, while CO2 additions do have a long term impact, it can be easily overwhelmed in the short term. It takes about 20 years of CO2 addition (at current rates) to approximately equal the amount of temperature swing we see from El Nino/La Nina (0.3/0.015).
     
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