Monday, March 5, 2012

2360.txt

cc: Keith Briffa <k.briffaatXYZxyz.ac.uk>
date: Mon, 16 Mar 2009 18:57:43 +0100
from: Bo Vinther <boatXYZxyz.ku.dk>
subject: Re: PAGES OSM talk
to: Edward Cook <drdendroatXYZxyzo.columbia.edu>

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Hi Ed

I have attached the data files for you - one file corresponding to the
figure on slide 2 (vdO18_50.xls) - and two files containing the ice core
data that went into the GRIP (6 cores) and DYE-3 (2 cores) averages....
Note that GISP2 data are based on deuterium measurements (instead of
oxygen-18) - this make the variability increase by a factor of 8 - but
the signal should be the same.

In general the more southerly cores experience higher annual
accumulation rates and therefore have the better signal to noise ratios.
Looking forward to hearing about what you find in the data....

Cheers.....Bo


Edward Cook wrote:

> Hi Keith,
>
> Very helpful. Bo, if you would be so kind to send me the individual
> ice core records I would have more freedom to play some games with
> them with respect to replication and signal strength issues for the
> OSM. Keith, any good examples from your Scandinavian tree-ring stuff
> would be useful as well.
>
> Thanks!
>
> Ed
> ==================================
> Dr. Edward R. Cook
> Doherty Senior Scholar and
> Director, Tree-Ring Laboratory
> Lamont-Doherty Earth Observatory
> Palisades, New York 10964 USA
> Email: drdendroatXYZxyzo.columbia.edu
> Phone: 845-365-8618
> Fax: 845-365-8152
> ==================================
>
> On Mar 15, 2009, at 11:44 PM, Keith Briffa wrote:
>
>> Bo
>> thanks for this - Joe Osborne is away at present but said he will
>> send the MSc report on tuesday - when I will pass it on to you and
>> Ed . Perhaps Ed might like the data used in your second slide - to
>> plot selected high and medium frequency curves separately ?
>> Whatever, it is important to stress other examples than tree rings
>> and this is a nice example- the coral work of Janice Lough and
>> others is also relevant here. Ed do you want any simple examples of
>> replication and quantification of signals from our Scandinavian tree-
>> ring stuff?
>>
>> cheers all
>> Keith
>>
>> At 09:08 16/03/2009, Bo Vinther wrote:
>>
>>> Dear Keith and Ed
>>>
>>> I have attached some ppt-slides showing the work on winter season
>>> ice core data that I have done together with Keith and Phil.
>>> Relationships with Greenland winter temperatures and the NAO for
>>> the past 150-200 years are also shown.
>>> Note (final slide) that whereas the PC1 of the ice core data is
>>> excellent for reconstructing Greenland temperatures - it tend to be
>>> less able to capture decadal NAO trends. But so does Greenland
>>> temperature data....
>>> If something is unclear/missing or you have any questions, then
>>> please feel free to ask....
>>>
>>> Cheers......Bo
>>>
>>>
>>>
>>> Keith Briffa wrote:
>>>
>>>> FYI
>>>>
>>>> Wondered if you might have something separate to send him - I will
>>>> send copy of Joe Osborne MSc report to you also - to ask if we
>>>> might publish anything from it?
>>>> Keith
>>>>
>>>>
>>>>> From: Edward Cook <drdendroatXYZxyzo.columbia.edu>
>>>>> To: Keith Briffa <K.BriffaatXYZxyz.ac.uk>
>>>>> Subject: PAGES OSM talk
>>>>> Date: Sun, 8 Mar 2009 12:13:51 +0800
>>>>> Cc: Edward Cook <drdendroatXYZxyzo.columbia.edu>
>>>>> X-Mailer: Apple Mail (2.930.3)
>>>>> X-Spam-Score: 0.00 () [Tag at 5.00] SPF(none,0)
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>>>>> Antispam-Training-Spam:
>>>>> Hi Keith,
>>>>>
>>>>> I am giving an invited talk at the PAGES Open Science Meeting (OSM)
>>>>> being held in Corvallis, OR on July 8-11, 2009. (I did not notice
>>>>> your
>>>>> name as a participant, so I guess you will not be there.) The
>>>>> title of
>>>>> my talk is "Reconstructing climate over the past millennium: the
>>>>> need
>>>>> for replication, calibration, and verification from a tree ring
>>>>> perspective". While I will emphasize replication, calibration, and
>>>>> verification using some tree-ring examples, I would also like to
>>>>> include some other proxies like ice cores. Several weeks ago you
>>>>> indicated some great success in using a well-dated d18O ice core
>>>>> stack
>>>>> from Greenland for reconstructing the NAO and also local
>>>>> temperatures.
>>>>> I believe a student of yours was doing this with you. It would be an
>>>>> excellent example of replication and calibration with a annually
>>>>> resolved (true?) proxy other than tree rings. Can you provide me
>>>>> with
>>>>> some figures I can use for presentation? All would be properly
>>>>> attributed to you and your student, others too if you so indicate.
>>>>>
>>>>> You also indicated that you would send me the NAO recon paper you
>>>>> did
>>>>> with your student. Can you send it to me? I would not give it out to
>>>>> anyone else of course without your permission.
>>>>>
>>>>> Am presently in Taiwan and go to Hawaii on March 11 to meet up with
>>>>> Michele. Of course the winter has been bad back in NY while I am
>>>>> over
>>>>> in Taiwan and Vietnam. I think Michele needs a break.
>>>>>
>>>>> I hope all is going well for you. Give my regards to Sarah and
>>>>> daughters when you see them.
>>>>>
>>>>> Cheers,
>>>>>
>>>>> Ed
>>>>> ==================================
>>>>> Dr. Edward R. Cook
>>>>> Doherty Senior Scholar and
>>>>> Director, Tree-Ring Laboratory
>>>>> Lamont-Doherty Earth Observatory
>>>>> Palisades, New York 10964 USA
>>>>> Email: drdendroatXYZxyzo.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/
>>>
>>>
>>>
>>>
>>>
>>
>> --
>> 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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Attachment Converted: "c:\eudora\attach\vdO18_50.xls"

Attachment Converted: "c:\eudora\attach\DYE3_vdO18_50.xls"

Attachment Converted: "c:\eudora\attach\GRIP_vdO18_50.xls"

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