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Ice cores suggest methane spike may be caused by plants, not hydrates

  1. Aug 24, 2006 #1


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  2. jcsd
  3. Aug 25, 2006 #2
    Isn't that curious. Well here is the abstract.

    However there is something fishy here and I'll explain later
  4. Aug 25, 2006 #3
    The fishy thing is here, of the last author, Jeff Severinghaus. http://icebubbles.ucsd.edu/pubs.html [Broken] is the most interesting.


    The idea is that temp changes change fractionation processes with heavy isotopes within the firn, causing an enrichment during the warming. Isotopes, that is, all the gas isotopes, isn't it? Seeing this abstract (anybody seen the complete study?) it does not appear that they corrected for this gravitational and molecular fractionation of the CH4 gas, did they?

    If indeed they did not, then the corrected 'warming' isotope ratio should be a lot lower, right?
    Last edited by a moderator: May 2, 2017
  5. Aug 25, 2006 #4


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    Here it is. http://static.mwnx.net/mac/Climatology/Ice%20record.pdf [Broken]
    Last edited by a moderator: May 2, 2017
  6. Aug 28, 2006 #5
    Testing Just lost a post worth of an hour work. :mad:

    Well here are the links

    http://www.ig.uit.no/~maarten/publications/Buenz_etal_Geophysics_2005.pdf [Broken]


    http://www.ig.uit.no/~maarten/publications/Mienert_Vanneste_etal_MPG_2005.pdf [Broken]

    http://www.sciencemag.org/cgi/data/313/5790/1109/DC1/1 [Broken]

    Bottom line was that Sowers and Schaefer et al see appear to see considerable differences in atmospheric oxidation and that the Clathrate methane source of the Preboreal, the Ormen Lange gas field was geologic methane not biogenic methane, with a different isotope signature.
    Last edited by a moderator: May 2, 2017
  7. Aug 28, 2006 #6


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    It hasn't happend to me for a while because I put a lot of saftey procautions on my browser, but I used to save long posts on notepad so I would still have them and laugh in the face of my computer when my window closed or something.
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