cc: Annie_Petsonk@environmentaldefense.org, "raymond s.bradley" , mhughes@ltrr.arizona.edu, Tim Osborn , "Phil Jones" , Keith Briffa date: Thu, 30 Oct 2003 07:02:45 -0500 from: "Michael E. Mann" subject: RE: Re: Fwd: Re: Editor's comments to: "Loschnigg, Johannes (Govt Affairs)" Dear Annie, Johannes, There is a late breaking development. It now looks, upon closer and closer reading, as if M&M, very subtly, dropped the key indicators of the Mann et al (1998) network from the period AD 1400-1600 in the reconstruction that they performed based on their own supposed 'version' of the Mann et al network--thats the version that has the huge spike between 1400-1600 (recall that the authors analysis using the Mann et al data network is wrong because of the data merge/scramble problems we've discussed before). The authors appear to generate the erroneous early warming spike by dropping out the key proxy data from the Mann et al network that gives that reconstruction its characteristic shape prior to 1600 or so. They appear to have eliminated the pre-1600 Western North American and Texas/Mexico data used by Mann et al (1998) based on the argument they couldn't find the older data in the public domain. This despite that fact the data is on NOAAs website and our public site. I'm working to confirm that w/ a 2nd opinion/read from various colleagues, but I'm almost sure this is true. If so, it constitutes intellectual dishonesty most foul indeed! Will update ASAP, mike ______________________________________________________________ Professor Michael E. Mann Department of Environmental Sciences, Clark Hall University of Virginia Charlottesville, VA 22903 _______________________________________________________________________ e-mail: mann@virginia.edu Phone: (434) 924-7770 FAX: (434) 982-2137 [1]http://www.evsc.virginia.edu/faculty/people/mann.shtml