On climate reconstructions

  1. A new study is published, "A surrogate ensemble study of climate reconstruction methods: Stochasticity and robustness."

    From the abstract:

    A draft of the full article
     
  2. jcsd
    Earth sciences news on Phys.org
  3. The first author elaborates about it here. Unfortunately it's in Danish but the google translater produces this of the first two paragraphs:

     
  4. Too bad that it is so difficult to draw much of any conclusion from all of this.

    Should be kept in mind that CO2 levels varied during this time with a corresponding influence on climate.

    From 1520's to 1620, CO2 levels actually fell.
    Then levels gradually rose until around 1740, after which they started climbing faster. Levels have continued to rise up to the present except during 1935-1945 period.


    http://cdiac.ornl.gov/trends/co2/lawdome.html

    and

    http://cdiac.ornl.gov/ftp/trends/co2/lawdome.smoothed.yr75
     
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