Mann’s 1209 temperature proxies

January 21, 2010

I believe that data used temperature reconstructions, which are in turn used to push for re-structuring the economy of the world, should be easily accessible to everybody.

You can view the plots of all 1,209 proxies used by Michael Mann for his 2008 hockey stick temperature reconstruction joined together into one giant image. Amazingly, the images are relatively small (less than one megabyte) and will download quite quickly. The proxies are arranged in alphabetical order, right to left and up to down.

Steve McIntyre, Jeff Id, and others have done a vast amount of work analyzing how Mann, et. al., used this data in hockey stick construction.  I am just starting to look at it in my own ignorant fashion, and expect to have a lot a fun

1000AD to 2000AD

Click on the graph at the left to see the 1209 proxies from which Michael Mann created his 2008 hockey stick.  This graph plots the data from 1000AD to 2000AD.  Note that most of these proxies cover only part of that year range.  There are some proxies that extend back further that 1000AD, but the pre 1000AD portion of the data has been truncated in these plots.

1500AD to 2000AD

Click on the graph on the left to see plots the data from 1500AD to 2000AD.  This shows the last 500 year a little closer up.

Download data

If you see a proxy of particular interest, note the name at the top of the graph.  Then go here to download the corresponding text file.  The file is tab delimited and will open nicely  in any spreadsheet.  The first column is the year, the second column is the proxy value.


Finally, you can get banner type versions of the graphical data.   The following banners are each 3 feet by 6 feet, each showing half of the proxy data (1000AD to 2000AD).   These versions will print out on a large format printer at Fedex-Kinko’s stores for about $14 each.  They  might make interesting conversation pieces in the classroom or office.  Left click on the links to see the banners, right-click on the links to download the files (only about 300 kilobytes each).

Part 1

Part 2


  1. Thanks for this reference! It IS a lot of fun.

    One of the best stat guys I have ever known always, always, always preached that one should go back and LOOK at the data. The human eye can be fooled, but more often than not it sees quite well.

    If scientists had done what they are supposed to do and asked questions or simply looked for themselves in the beginning, I wonder where we would be now?

  2. Jeff Id at The Air Vent has a hockeystick-o-matic ™ at http://noconsensus.wordpress.com/hockey-stick-posts/

    Using Mann’s own data, and Mann’s own algorithm; you can generate your own hockeystick, upside down hockeystick, or just about any other pattern you would like to prove is in the proxy record.

    If you want to learn the data manipulation language and program “R”, this is a good way to get started.

    • Dear Charlie A,

      Thanks for pointing out Jeff Id’s work. I had already downloaded his and found it useful. However, my preferred programming language is LabVIEW.

      Best Regards

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