Wednesday, April 25, 2012

3508.txt

date: Fri Apr 5 10:34:06 2002
from: Keith Briffa <k.briffaatXYZxyz.ac.uk>
subject: Re: grid square maximum temperature data
to: "Rob Wilson" <rjwilsonatXYZxyz.ca>

Rob
This is just to say paper accepted and forwarded to John. As for the request to Phil , I do
not believe we have the data in the form you want Phil will no doubt respond but I just
wanted to let you know
that the best thing to do in the meantime is look at Mark New's data set , available from
the web site . These have Diurnal Temperature range and mean and you may be able to extract
the maximums.I am following up your suggestion of the maximum temperature effect by looking
at mean / max differences in areas we have data to correspond with our gridded density data
(specifically areas of Canada and Russia) . We have an EC project just starting (ALPIMP)
that will collect and aggregate Alpine data.
Best wishes
Keith
At 09:57 PM 4/4/02 -0500, you wrote:

Dear Phil,
John Topham and I have recently extended living spruce ring-width data for the Bavarian
Forest and Austrian Alps back to the late 13th century using TR series measured from
violins and other string instruments.

We are writing a short paper to assess the potential of using these data for climate
reconstruction purposes.

When I compare the ring-width data to mean June/July temperatures, there is a reasonable
relationship between the series. However, after 1950, there is a divergence between the
RW and temperature data. This, of course, might be the same phenomenon that Keith has
written about.

I have also noted such a divergence with my work in Canada. I got around the problem by
developing reconstructions of maximum rather than mean temperatures . The hypothesis
being that trees respond more to daytime temperatures rather than night-time
temperatures. Therefore trends in minimum nightime temperatures, if different from
daytime maximum temperatures, may bias the trends in the mean function.

My ideas appear to work well in my Canadian work. However, it would be nice to validate
my hypothesis in a completely different region. I hope to try this in the Alpine region.

Presently I only have access to mean temperature data in the Alpine region - i.e. your
gridded anomaly data.

I was wondering if you could send me any maximum (and minimum?) temperature data for the
relevant region of the European Alps. The attached pdf file shows the 5x5 degree grid
square I am currently using. Its lats and longs are 45-50N 10-15E. The black circles
show the two locations where the living TR data come from.

I have taken the liberty to also cc this message to Keith as he may be interested in
what I am doing.

best regards
Rob
------------------------------------------
Rob Wilson.
Tree-Ring Lab, Department of Geography
University of Western Ontario
London, Ontario, Canada, N6G 3A9
Tel: 519 645 87 57
Home Page: [1]http://publish.uwo.ca/~rjwilson/
Curriculum Vitae: [2]http://publish.uwo.ca/~rjwilson/CV/CV.html

".....I have wondered about trees.

They are sensitive to light, to moisture, to wind, to pressure.
Sensitivity implies sensation. Might a man feel into the soul of a tree for
these sensations? If a tree were capable of awareness, this faculty might
prove useful. "

"The Miracle Workers" by Jack Vance

--
Professor Keith Briffa,
Climatic Research Unit
University of East Anglia
Norwich, NR4 7TJ, U.K.

Phone: +44-1603-593909
Fax: +44-1603-507784
[3]http://www.cru.uea.ac.uk/cru/people/briffa[4]/

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