date: Thu, 26 Jun 2003 14:23:00 -0400 from: Edward Cook subject: Re: IMAGES meeting extended abstract to: Keith Briffa Hi Keith, With suitable revision, do you think that what I have written could go into The Holocene as a Forum article? I think that there is still enough controversy and uncertainty about all of this stuff that a Forum article would be justified. I still get a number of inquiries about the Esper paper and recently was invited by Crowley to talk at Duke (same meeting Phil was at). Let me know what you think. Ed >Ed tried to ring but this will do >Have read the abstract and my comments are >1/ thanks for keeping me in the loop and the citations >2/ reads well , and quaint at times >3/ page 2 half way down - the 2out of growing season2 signal could >also arise through the winter climate preconditioning the growing >season climate ( ie cold winter = delayed soil thawing, or dry >reducing groundwater recharge etc). >4/ bottom of page with Figure 6 in - you say not clear why ECS has >highest amplitude. Partly as you have scaled low-frequency against >Mann ( but you cover this later) >5/ next page - a third way down - our purpose in re-calibrating ECS >against high frequency data was not to say that was the "right" way >- but only to demonstrate the sensitivity in the absolute amplitude >of early fluctuations (trends) to the calibration procedure >(important if the reconstruction is to be used to define the >sensitivity of EBMs - such as in Crowley's work. >Your point at the end re the 500-1000 year variability is well taken >- and re-emphasised by spectra of the long Fennoscandian or Russian >(or composite Eurasian ) curves I et al have produced. > >ALL THE ABOVE ARE COMMENTS FOR DISCUSSION AND I WOULD NOT SUGGEST >THE CHANGE OF EVEN A SINGLE CURVE. >I would just mention that the lack of coherence in the below 20-year band >should be explored more , through the local/regional calibration of >the data and aggregation of reconstructions - as we will do - won't >we? >Keith > > >At 09:51 AM 6/26/03 -0400, you wrote: >>Hi Keith, >> >>Here is an extended abstract of a talk I am giving at the IMAGES >>Workshop to be held in Norway in August. Because it touches on a >>number of issues relating to the Esper et al. (2002) work, >>including some of yours, I am sending it to you for comments. I >>need to send it to the meeting convenor by Friday, so any changes >>you want me to make must be sent to me by Friday afternoon your >>time. I don't think that there is anything in it that you would >>STRONGLY disagree with. >> >>I am NOT sending it to Phil or Mike for comments, but I am sure >>they will see it at some point. Bradley will too since he will be >>at the workshop as well. >> >>Cheers, >> >>Ed >>-- >>================================== >>Dr. Edward R. Cook >>Doherty Senior Scholar and >>Director, Tree-Ring Laboratory >>Lamont-Doherty Earth Observatory >>Palisades, New York 10964 USA >>Email: drdendro@ldeo.columbia.edu >>Phone: 845-365-8618 >>Fax: 845-365-8152 >>================================== >> > >-- >Professor Keith Briffa, >Climatic Research Unit >University of East Anglia >Norwich, NR4 7TJ, U.K. > >Phone: +44-1603-593909 >Fax: +44-1603-507784 > >http://www.cru.uea.ac.uk/cru/people/briffa/ -- ================================== Dr. Edward R. Cook Doherty Senior Scholar and Director, Tree-Ring Laboratory Lamont-Doherty Earth Observatory Palisades, New York 10964 USA Email: drdendro@ldeo.columbia.edu Phone: 845-365-8618 Fax: 845-365-8152 ==================================