From	Darrell Kaufman	Date	Fri, 6 Mar 2009 11:59:30 -0700
To	Keith Briffa
Subject	Re: 2k Arctic synthesis
Great. I'll play with both the composite series and the three individuals. I was hoping to get some spatially distributed information, so might include all three. I will also subdivide by proxy time and use PCA to examine spatial patterns. I'll take a stab at revising the text to include a few sentences about how we chose the tree-ring series. Then maybe you can take a look on Monday. Have a good weekend. Darrell On Mar 6, 2009, at 11:54 AM, K.Briffa@uea.ac.uk wrote: > Darell > the short answer is yes - you need to give the appropriate weight > to the > Eurasian aggregate series though ie this one series should count as > 3 in > an average of all high -latitude (e.g. compared to Rosanne D'Arrigo > west > N. American series) unless you use the 3 separate > series(Fennoscania,Yamal, Taimyr) individually. I would use my single > average series as is though. While you are doing this work , I > suggest you > also produce separate proxy type series (ice, lakes, trees) - for > explicit > comparison and perhaps separate half-hemisphere (US side and Eurasian > side) though not sure if Greenland ice should go in either. Cheers > Keith > > > > > directlty> Keith: >> Thanks for the update. I'd like to revise the composite proxy record >> over the weekend (my only spare time). Can I assume that I need to >> omit the three tree-ring series that I took from Mann et al. (2008) >> because they were not processed to retain the low frequency signal, >> and that I should replace the Euraisan series with the three from >> your recent Phil Trans paper (using the data on your website)? >> >> If you agree, I can work on revising all of the calculations and >> figures and we can modify the text early next week. >> >> Would that work? >> Darrell >> >> >> On Mar 6, 2009, at 9:52 AM, Keith Briffa wrote: >> >>> Darrell >>> REALLY sorry - have not done this yet - had back >>> to back meetings for 2 days and am due to leave >>> now for the weekend - couple of days away from >>> computer - my comments are nothing earth >>> shattering or voluminous but I would still like >>> to make them for your consideration. I will try >>> to do this on Monday now - if too late - just ignore me . Sorry >>> again >>> Keith >>> >>> thanks for your consideration >>> cheers >>> Keith >>> >>> At 15:01 03/03/2009, you wrote: >>>> Keith: >>>> I appreciate your willingness to squeeze this in on such short >>>> notice. If you could get your comments to me by the end of the >>>> week, >>>> that would be more than I had hoped for. Thank you. Darrell >>>> >>>> >>>> On Mar 3, 2009, at 7:56 AM, Keith Briffa wrote: >>>> >>>>> Darrell >>>>> I would like to make some comments but the >>>>> earliest I can get to this is Thursday (we have >>>>> visitors here all day tomorrow. In short I would >>>>> like to be involved - but I would rather wait and >>>>> see the basis of your reaction to my initial >>>>> thoughts when I get a Tracked changes version >>>>> back to you. You are correct that there are >>>>> clear limitations in the preservation of trend >>>>> over two millennia in SOME of the data Mann et al >>>>> used - and in the current series you cite for >>>>> Yamal (Hantemirov et al) . I do believe that the >>>>> composite series in our Phil Trans paper is a >>>>> convenient representation of the circum-western >>>>> Eurasian Arctic tree-line data - though the Grudd >>>>> and Nauzbaev papers are virtually similar to our >>>>> data for their areas. However I have a few >>>>> reservations/comments on other aspects of the >>>>> manuscript that I believe any likely referee >>>>> might pick up on . Is it ok to wait til Thursday >>>>> or will this not be acceptable for getting >>>>> comments back? I know how these time lines are crucial. Best >>>>> wishes >>>>> Keith >>>>> >>>>> At 14:15 02/03/2009, you wrote: >>>>>> Hello Keith: >>>>>> Following the recommendations of Malcolm and Phil (via Ray), it's >>>>>> clear that I should have come to you sooner. I am now well along >>>>>> on a >>>>>> manuscript that summarizes 2000-year-long proxy temperature >>>>>> records >>>>>> from the Arctic (attached). The impetus for the paper is the new >>>>>> compilation of high-resolution lake records that my group >>>>>> recently >>>>>> published in J Paleolimnology. >>>>>> >>>>>> On the tree-ring side, it's clear to me now that I should not >>>>>> have >>>>>> used the series from the Mann et al. compilation, and I hadn't >>>>>> see >>>>>> your 2008 Phil Trans paper until just last week. As far as I can >>>>>> tell, the only records that meet the criteria for this study are >>>>>> your >>>>>> three new RCS series from Eurasia and D'Arrigo's Gulf of Alaska >>>>>> record. Apparently, none of the Malcolm's series in Mann et al. >>>>>> were >>>>>> processed in a way that would preserve the millennial trend, and >>>>>> these should be omitted from the synthesis. >>>>>> >>>>>> I now need to substantially revamp the manuscript. Before I do, I >>>>>> want to be sure that I get it right this time and hope that you >>>>>> will >>>>>> be interested in joining as co-author to help guide the tree-ring >>>>>> component of the synthesis. I see that you have posted the Phil >>>>>> Trans >>>>>> data on your website, but would much prefer to have your >>>>>> involvement >>>>>> before using the data. >>>>>> >>>>>> Unfortunately, the timing for submission is an issue. I am >>>>>> leading a >>>>>> 12-PI proposal that is currently pending and would benefit >>>>>> greatly if >>>>>> this paper were accepted for publication. >>>>>> >>>>>> Please have a look at the manuscript, which I realize needs >>>>>> substantial revisions, and let me know if you have time and >>>>>> interest >>>>>> in getting involved. >>>>>> >>>>>> Thanks, >>>>>> Darrell >>>>>>  >>>>>> >>>>>> Darrell S. Kaufman >>>>>> Professor of Geology and Environmental Sciences >>>>>> Northern Arizona University >>>>>> 928-523-7192 >>>>>> http://jan.ucc.nau.edu/~dsk5/ >>>>>> >>>>>> >>>>>> >>>>>> >>>>>> >>>>>> Hello Keith: >>>>>> Following the recommendations of Malcolm and >>>>>> Phil (via Ray), it's clear that I should have >>>>>> come to you sooner. I am now well along on a >>>>>> manuscript that summarizes 2000-year-long proxy >>>>>> temperature records from the Arctic (attached). >>>>>> The impetus for the paper is the new compilation >>>>>> of high-resolution lake records that my group >>>>>> recently published in J Paleolimnology. >>>>>> >>>>>> On the tree-ring side, it's clear to me now that >>>>>> I should not have used the series from the Mann >>>>>> et al. compilation, and I hadn't see your 2008 >>>>>> Phil Trans paper until just last week. As far as >>>>>> I can tell, the only records that meet the >>>>>> criteria for this study are your three new RCS >>>>>> series from Eurasia and D'Arrigo's Gulf of >>>>>> Alaska record. Apparently, none of the Malcolm's >>>>>> series in Mann et al. were processed in a way >>>>>> that would preserve the millennial trend, and >>>>>> these should be omitted from the synthesis. >>>>>> >>>>>> I now need to substantially revamp the >>>>>> manuscript. Before I do, I want to be sure that >>>>>> I get it right this time and hope that you will >>>>>> be interested in joining as co-author to help >>>>>> guide the tree-ring component of the synthesis. >>>>>> I see that you have posted the Phil Trans data >>>>>> on your website, but would much prefer to have >>>>>> your involvement before using the data. >>>>>> >>>>>> Unfortunately, the timing for submission is an >>>>>> issue. I am leading a 12-PI proposal that is >>>>>> currently pending and would benefit greatly if >>>>>> this paper were accepted for publication. >>>>>> >>>>>> Please have a look at the manuscript, which I >>>>>> realize needs substantial revisions, and let me >>>>>> know if you have time and interest in getting involved. >>>>>> >>>>>> Thanks, >>>>>> Darrell >>>>>> >>>>>> >>>>>> >>>>>> Darrell S. Kaufman >>>>>> Professor of Geology and Environmental Sciences >>>>>> Northern Arizona University >>>>>> 928-523-7192 >>>>>> http://jan.ucc.nau.edu/~dsk5/ >>>>> >>>>> -- >>>>> 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/ >>>> >>>> -- >>>> 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/ >>> >> >> > >