date: Fri Oct 6 07:55:19 2000 from: Phil Jones subject: Re: Power spectral figure for the TAR to: Myles Allen Myles, It is the sort of thing we plan to do. Tim is off next week to spend 2 weeks with Mike in Charlottesville. Cheers Phil At 05:19 PM 10/5/00 +0100, you wrote: >Hi Phil, > >Thanks for checking that -- doing the same thing with Mann et al would >obviously be interesting, but without subsampling and processing the >controls in the same way the observations have been massaged in his >reconstruction, I'm not sure how meaningful the results would be. Isn't >think pretty much what you're doing with Keith and Tim on that NERC >project I reviewed? > >The nice thing about the obs-minus-all-forcings case is that all the main >sources of bias in the observed spectrum are to over-estimate the variance >on all timescales, giving a defensible upper bound. I can imagine a lot >of the processing the Mann et al series has been through rather bleaching >the colour out of it. > >Myles > >---------------------------------------------------------------------- >Myles R. Allen Phone (RAL): 44-1235-446480 >Space Science & Technology Department Ph (Oxford): 44-1865-272085 >Rutherford Appleton Laboratory Fax: 44-1235-445848 >Chilton, Didcot, OX11 0QX e-mail: m.r.allen@rl.ac.uk >United Kingdom http://www.climate-dynamics.rl.ac.uk/ >---------------------------------------------------------------------- > >On Thu, 5 Oct 2000, Phil Jones wrote: > >> >> Myles, >> You have my data in OK. The warmth of the last few years seems to >> be having an effect. Have you tried a similar exercise with the Mann et al. >> data ? >> >> Cheers >> Phil >> >> Prof. Phil Jones >> Climatic Research Unit Telephone +44 (0) 1603 592090 >> School of Environmental Sciences Fax +44 (0) 1603 507784 >> University of East Anglia >> Norwich Email p.jones@uea.ac.uk >> NR4 7TJ >> UK >> >> ---------------------------------------------------------------------------- >> >> >> > >