Quelccaya Accumulation

Quelccaya accumulation are 2 of only 14 proxies in MBH99. I think that it was the very first Mann proxy series that I posted about (circa May 2003), as the underlying data looked very strange when plotted. Hans Erren has posted up an interesting analysis which both explains the strange appearance of the series as an aliasing effect and Thompson never digitized key aspects of the underlying data set and has no plans to do so. I’ve mentioned elsewhere that Thompson has distributed 3 different and inconsistent versions of the Dunde data and has not archived original data for Dunde, Guliya and Dasuopu. Someone really needs to tie strings to the mittens of the Hockey Team.

See here. Aliasing artifact illustrated as follows:


  1. Hans Erren
    Posted Feb 11, 2005 at 4:01 AM | Permalink

    Hi Steve,

    Thanks for posting. But to be honest Lonnie Thompson actually didn’t lose the information. He just didn’t see the importance of digitally archiving the observed layer thicknesses.

    I would suggest digitizing the core log is still an interesting exercise for an undergraduate thesis, and 20 years overdue.

  2. Steve McIntyre
    Posted Feb 11, 2005 at 7:24 AM | Permalink

    Hans, I edited the comment to correct for this. Thanks, Steve

  3. Posted Aug 5, 2005 at 3:04 PM | Permalink

    After my webserver crashed I changed host. My quelccaya study can now be found here:

  4. TCO
    Posted Sep 11, 2005 at 3:44 PM | Permalink

    Why don’t you publish, Hans? And wrt to the old data logs. Can’t they be scanned into a pdf or faxed or something? Then someone else can transcribe them into digital data. Just pay a secretary or whatever. use some of that grant money that steve is overdue for applying for.

  5. Posted Sep 11, 2005 at 4:32 PM | Permalink

    wrt 4:
    It is published. http://home.casema.nl/errenwijlens/co2/quelccaya.htm More completely and to a much wider audience (and free of charge) than anybody can wish for in a “peer” reviewed journal.

    As with the Quelccaya ice core data: Dr Lonnie Thompson is sitting on them, it is HIS duty to release it fully and completely, instead of spending his grants on collecting new stuff. He can easily put a student or two doing an MSc to digitize the lot.

    Thompson: “Sorry I can not be more helpful on these old data sets.”

    Au contraire, he SHOULD be more helpful on this old dataset. As it is one of the cornerstones of MBH98, which is THE cornerstone of IPCC TAR.

  6. TCO
    Posted Sep 11, 2005 at 4:39 PM | Permalink

    If you publish it in a peer-reviewed format, you will be forced to better work and it will be available in hard copy as a matter of record.

  7. Posted Sep 12, 2005 at 8:57 AM | Permalink

    re: #6
    Nature isn’t available in hardcopy anymore in Delft University Library. It’s all digital subscription these days.

    When time permits I’ll submit. I only have eight hours per week for climate.

  8. TCO
    Posted Sep 12, 2005 at 9:20 AM | Permalink

    It’s not that it’s available to you! It’s that it is recorded as a matter of record!

    gotta publish in the real journals. If not, it’s just playing around…

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