A science presenter, writer, speaker & former TV host; author of The Skeptic's Handbook (over 200,000 copies distributed & available in 15 languages).



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Climate Science (Key points & Scandals)

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The Missing Hot Spot

The models are wrong (but only by 400%)

Hockey Stick Graph


Missing Heat

How the oceans drive the climate

Sea-Levels:   Last 200 years | Adjustments lift it by 10% | Australian (All sea level pages)

Temperature Sets

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5 comments to Climate Science (Key points & Scandals)

  • #

    do we have any discussions or references to the isotope analysis of atmospheric CO2 calculates the relative proportion of fossil derived CO2 , either ppm or % ?
    I have seen the isotope analysis results , but they never seem to translate the isotope ratio into real world ppm data.


    • #
      Gee aye

      Odd place for this.

      It is rather simple I think. The methods used for measuring relative abundances of isotopes are pretty much blind to the ppm of CO2 in the sample. The input sample also varies in ppm and ratios depending on time of year and collection location. To work out the ppm simply use the ratios and apply them to the ppm found at the time of collection using the assumption of concordance. The answer you get will be an estimate so should be stated as “estimated ppm”.


      • #

        Thanks Gee Aye,
        But assuming the “sample” being analysed is a representitive (400ppm CO2) , i thought the whole objective of the analysis was to establish how much Fossil derived CO2 was present.
        All i see is the isotope “ratio” changing from -7 to -8.5 ….but that tells me nothing about the ppm of fossil CO2 content.
        There must be a conversion method/ factor,


        • #
          Gee aye

          I’m unsure of what numbers you are quoting there.

          A made up example – C 12:13:14 = 2:1:1 then that would be 200:100:100 in 400ppm.


  • #

    I posted here because i was looking for information via the “reference pages”. Section, but could find nothing there


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