Tim Channon: Extrapolating 10Be data from Fujidome

Posted: February 19, 2011 by tallbloke in solar system dynamics

10Be is an isotope of the element Beryllium. Scientists think that its concentration in ice cores is indicative of past solar activity and hence climate.
The Fujidome ice cores have been examined for their 10Be content for the period 700AD to 1900AD. The data is available from NOAA here.

Tim has been developing software which analyses signals. Originally he was developing this for audio/acoustic work, but has found that interesting results can be obtained when the code is fed with climatic datasets. Tim wishes to stress that the output is a tentative attempt at reconstruction and should not be taken as forming a strong claim to validity. However, we feel it worth ‘putting out there’ as it does seem to be consistent with other paleo reconstructions of past climate.

See the graph which extrapolates the Fujidome 10Be record below the break.

Red data is Fujidome 10Be. Blue curve is Tim’s reconstruction.

Hey look! A Roman Warm period and a Medieval Warm period! 🙂

  1. David says:

    What part of the solar spectrum most affects 10Be?

  2. tallbloke says:

    Hi David, I suspect it’s more a function of solar windspeed.

  3. lgl says:

    And then add Ljungqvist 2010 …


  4. tallbloke says:

    Brilliant. Thanks lgl.
    Vuk also emailed me earlier and added a geomag plot:
    Vuk - Geomag 10Be

  5. Tim Channon says:

    “What part of the solar spectrum most affects 10Be?”

    None. It is about cosmic radiation and magnetic fields affecting how much hits earth. The solar magnetic field is involved, hence the solar relationship.
    Trouble is that is not all.

    This of course is also related to cloud nucleation if that is a real effect.

    A major problem is the inconsistency between 10BE proxy records, a matter of ongoing work.

    In my opinion a major problem arises in flux calculation. 10BE is measured in an ice layer and then the amount of water is used to calculate a flux. This puts weather into the equation which moreover some say is related to the flux.

    I think the question could be ‘How is the magnetic flux related to the solar spectrum?’

  6. Tim Channon says:

    Those are interesting data additions.

  7. tallbloke says:

    Another series from Vuk. I’ve inverted the curve to maintain the orientation sense.

    Vuk McCracken 10Be