cc: Scott Rutherford date: Mon, 19 Jan 2004 13:42:37 -0700 from: "Malcolm Hughes" subject: Re: J. Climate paper - in confidence to: "Malcolm Hughes" , Tim Osborn , Briffa Keith , "Michael E. Mann" Mike - there are the following density data in that set: 1) 20 Schweingruber/Frttss series from the ITRDB (those that met the criteria described in the Mann et al 2000 EI paper) 2) Northern Fennoscandia reconstruction (from Keith) 3) Northern Urals reconstruction (from Keith) 4) 1 density series for China (Hughes data) and one from India (also Hughes data) - neither included in Keith's data set, I think. 5) To my great surprise I find that you used the Briffa gridded temperature reconstruction from W. N. America (mis-attributed to Fritts and Shao) - of course I should have picked up on this 6 years ago when reading the proofs of the Nature sup mat. It was my understanding that we had decided not to use these reconstructions, as the data on which they were based were in the ITRDB, and had been subject to that screening process. So depending on whether you used the long or the shorter versions of these, there will have been a considerable number of density series included , some of them twice. It means that there is considerably more overlap between the two data sets, in North America, than I have been telling people. I stand corrected. Cheers, Malcolm . .Malcolm Hughes Professor of Dendrochronology Laboratory of Tree-Ring Research University of Arizona Tucson, AZ 85721 520-621-6470 fax 520-621-8229