A meeting of wits trying to make the halfway mark.
From: Keith Briffa <k.briffa@xxxxxxxxx.xxx>
To: Tom Wigley <wigley@xxxxxxxxx.xxx>
Subject: Re:
Date: Tue Nov 4 09:42:07 1997
Tom
please do. Actually I would be interested to know whether Malcolm mentioned these results to Dave as he was in Krasnoyarsk a few months ago when I showed this stuff. I will be over in New York in a few weeks to discuss with Ed the possibility of putting in an NSF/NERC proposal to look at the tree biomass change question. Also,the initial impetus to redo this stuff was as part of a NERC project we have running in colllaboration with Ian Woodward - i which we are inputting high resolution climate data to Dolly to assess the roll of such variability on carbon uptake
cheers
Keith
At 02:54 PM 11/3/97 -0700, you wrote:
>Keith,
>
>Malcolm Hughes was here on Friday to see Dave Schimel about precisely the
>issue you raise. Dave wants to see if he can validate his ecosystem model
>using tree ring data. Sounds as if you already have the data to do this.
>Can I show your e-mail to Dave?
>
>Tom
>
>On Mon, 3 Nov 1997, Keith Briffa wrote:
>
>>
>> Tom
>> thanks for the info. Actually this is a chance for me to to mention that
>> we have for the last few months at least, been reworking the idea of
>> looking in the Schweingruber network data for evidence of increasing tree
>> growth and hence ,potentially at least, evidence of changing tree(read
>> biomass) uptake of carbon.
>> The results are dramatic - not to say earth shattering because they
>> demonstrate major time-dependent changes - but changes that are consistent
>> in different areas of the network. We have regionalised over 350 site
>> collections , each with ring width and density data , age-banded the data
>> so that we look only at relative growth in similar ages of trees through
>> time and recombined the standardisd curves to produce growth changes in
>> each region. Basically growth is roughly constant (except for relatively
>> small climate variablity forcing) from 1700 to about 1850.
It then
>> increases linearly by about up until about 1950 after which time young ( up
>> to 50 year old) basal area explodes but older trees remain constant . The
>> implication is a major increase in carbon uptake before the mid 20th
>> century - temperatue no doubt partly to blame but much more likely to be
>> nitrate/Co2 . Equally important though is the levelling off of carbon
>> uptake in the later 20th century...."
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I'm done being nice with you, Warmer
Your "science"
sucks!