From: Darrell Kaufman <Darrell.Kaufman@nau.edu>
To: "K.Briffa@uea.ac.uk" <K.Briffa@uea.ac.uk>
Subject: Re: 2k Arctic synthesis
Date: Fri, 6 Mar 2009 11:59:30 -0700

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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/>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/
>>>
>>
>>
>
>

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