Friday, April 13, 2012

3380.txt

date: Thu Nov 5 08:31:28 2009
from: Phil Jones <p.jonesatXYZxyz.ac.uk>
subject: Re: Clarification on data availability
to: philatXYZxyzenbridge.com

Phil,
I wouldn't believe this some person - the one you linked to. Of course I don't agree
with this assertion. I doubt that Pat Michaels has read through the papers I sent you
details of yesterday - the one on the CRU Temperature web page and the one I attached.
The dataset isn't changing that much. We recently added revisions to many stations in
the Alpine area as a result of an EU project. In the last couple of years we've also added
revised data for Canada, Australia and NZ. We've yet to write these up, but I can tell you
the net effect if essentially zero change to trends over the time periods that the IPCC
report used. There are differences but they are well within the error estimates of
individual years that Brohan et al (2006) produced.
There is a paper coming out soon in JGR which shows excellent agreement with the latest
set of Reanalyses performed in Europe. This should prove to people that the record is
reliable. It is an extension of this paper attached. In the attached NCEP and ERA are
incorrect before the late-1970s because of the problems discussed in the paper - mainly the
lack of satellite estimates before this time.
It would take a few months to get back to what we had in the mid-1980s. As I said
yesterday the effort would be a waste of resources.
Cheers
Phil

At 02:27 05/11/2009, you wrote:

Phil--thanks for the prompt reply. If I understand you correctly, you remove data
series because of things such as urbanization effects that affect the station errors, or
the stations moving? I suppose this means the data set is always changing because of
these issues?
When you say you could reassemble it quite easily, how long would it take? To which
state would you reassemble it if it is always changing?
Some [1]people are saying that this means there are no "reliable records of global
surface temperature" because of this. Do you agree?
Many thanks
Phil
Phil Jones wrote:

Phil,
Yes - we could reassemble it quite easily. We have all the adjustment factors.
We also have the lists of the few stations totally removed (~150). We could get these
back from GHCN.
These were removed because of urbanization effects and multiple jumps/moves.
We're not keen on doing any of this as we know it is a complete waste of time. To
know why read this paper.
Brohan, P., Kennedy, J., Harris, I., Tett, S.F.B. and Jones, P.D., 2006: Uncertainty
estimates in regional and global observed temperature changes: a new dataset from 1850.
J. Geophys. Res. 111, D12106, doi:10.1029/2005JD006548.
You can get this from here - [2]http://www.cru.uea.ac.uk/cru/data/temperature/ This
links to the pre-publication version.
Look in this paper about homogeneity adjustments - and see that they have hardly any
effect. See also the attached - Figure 6.
Apart from the stations that we deleted (which we can get back) we haven't deleted
anything.
We never had the original records to destroy anyway - the relevant Met Services have
these!
I know the web says other things - but hardly anybody has ever bothered to check with
me or look over our web site.
A lot of people read what they want to read.....
Cheers
Phil
At 16:11 04/11/2009, you wrote:

Hi Phil,
Can you kindly clarify this statement regarding data availability from CRU's [3]website
: "We, therefore, do not hold the original raw data but only the value-added
(i.e.quality controlled and homogenized) data.". Does this mean that to if CRU wanted
to recreate the value added data you would have to reassemble the original data?
There is information on the web, such as [4]this, that the data has been "destroyed." Is
this true?
Thank you
Phil
--
Phil Green
Greenbridge Management Inc.
905-271-6262 land/cell
[5]http://www.greenbridge.com
[6]phil@greenbridge.com

Prof. Phil Jones
Climatic Research Unit Telephone +44 (0) 1603 592090
School of Environmental Sciences Fax +44 (0) 1603 507784
University of East Anglia
Norwich Email [7]p.jones@uea.ac.uk
NR4 7TJ
UK
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--
Phil Green
Greenbridge Management Inc.
905-271-6262 land/cell
[8]http://www.greenbridge.com
[9]phil@greenbridge.com

Prof. Phil Jones
Climatic Research Unit Telephone +44 (0) 1603 592090
School of Environmental Sciences Fax +44 (0) 1603 507784
University of East Anglia
Norwich Email p.jonesatXYZxyz.ac.uk
NR4 7TJ
UK
----------------------------------------------------------------------------

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