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One Year Ago Today Breaking News Story: CRU has apparently been hacked
Watts Up With That? ^ | November 19, 2010 | Anthony Watts

Posted on 11/19/2010 11:46:32 AM PST by Ernest_at_the_Beach

One year ago today, after returning from a conference in Brussels, I sat down in Dulles airport, connected to WiFi, researched and wrote this article, called two people, CEI’s Chris Horner to check legality issues, and Marc Morano (who was traveling in car on the PCH in California) to give him a heads up, and pressed the “publish” button just seconds before they closed the door to my flight back to Sacramento. When I landed five hours later, I immediately got back on WiFi and found the the story had exploded, and we lived in a different world. I spent so much time moderating and checking the responses elsewhere, that when I looked up from the computer, I found the airport deserted, and my bag was to lone one sitting on the carousel.

This story, written in haste, uncertainty, and pressure to board a plane, is the most viewed story on WUWT, and spawned hundreds of other stories and links. I’m repeating it again to mark the event, consider this an open thread on Climategate, one year later. – Anthony


UPDATE: Response from CRU in interview with another website, see end of this post.

The details on this are still sketchy, we’ll probably never know what went on. But it appears that University of East Anglia Climate Research Unit has been hacked and many many files have been released by the hacker or person unknown.

UPDATED: Original image was for Met Office – corrected This image source:

I’m currently traveling and writing this from an airport, but here is what I know so far:

An unknown person put postings on some climate skeptic websites that advertised an FTP file on a Russian FTP server, here is the message that was placed on the Air Vent today:

We feel that climate science is, in the current situation, too important to be kept under wraps.

We hereby release a random selection of correspondence, code, and documents

The file was large, about 61 megabytes, containing hundreds of files.

It contained data, code, and emails from Phil Jones at CRU to and from many people.

I’ve seen the file, it appears to be genuine and from CRU. Others who have seen it concur- it appears genuine. There are so many files it appears unlikely that it is a hoax. The effort would be too great.

Here is some of the emails just posted at Climate Audit on this thread:

I’ve redacted email addresses and direct phone numbers for the moment. The emails all have US public universities in the email addresses, making them public/FOIA actionable I believe.

From: Phil Jones
Subject: Fwd: John L. Daly dead
Date: Thu Jan 29 14:17:01 2004


From: Timo H‰meranta

Subject: John L. Daly dead
Date: Thu, 29 Jan 2004 12:04:28 +0200
X-Mailer: Microsoft Outlook, Build 10.0.4510
Importance: Normal

In an odd way this is cheering news ! One other thing about the CC paper – just found
another email – is that McKittrick says it is standard practice in Econometrics journals
to give all the data and codes !! According to legal advice IPR overrides this.



“It is with deep sadness that the Daly Family have to announce the sudden death of John
Daly.Condolences may be sent to John’s email account (

Reported with great sadness

Timo H‰meranta

Timo H‰meranta, LL.M.
Moderator, Climatesceptics

Martinlaaksontie 42 B 9
01620 Vantaa
Finland, Member State of the European Union

Private: timo.hameranta@xxxxx.xx

Home page: [1]

Moderator of the discussion group “Sceptical Climate Science”

“To dwell only on horror scenarios of the future

shows only a lack of imagination”. (Kari Enqvist)

“If the facts change, I’ll change my opinion.
What do you do, Sir” (John Maynard Keynes)


Prof. Phil Jones
Climatic Research Unit Telephone +44 (0)xxxxxx
School of Environmental Sciences Fax +44 (0) xxxxxx
University of East Anglia
Norwich Email p.jones@xxx.xx.xx




From: Phil Jones
To: ray bradley ,,
Subject: Diagram for WMO Statement

Date: Tue, 16 Nov 1999 13:31:15 +0000
Cc: k.briffa@xxx.xx.xx,


Dear Ray, Mike and Malcolm,
Once Tim’s got a diagram here we’ll send that either later today or
first thing tomorrow.
I’ve just completed Mike’s Nature trick of adding in the real temps
to each series for the last 20 years (ie from 1981 onwards) amd from
1961 for Keith’s to hide the decline. Mike’s series got the annual
land and marine values while the other two got April-Sept for NH land

N of 20N. The latter two are real for 1999, while the estimate for 1999
for NH combined is +0.44C wrt 61-90. The Global estimate for 1999 with
data through Oct is +0.35C cf. 0.57 for 1998.
Thanks for the comments, Ray.


Prof. Phil Jones
Climatic Research Unit Telephone +44 (0) xxxxx
School of Environmental Sciences Fax +44 (0) xxxx

University of East Anglia
Norwich Email


From: Jonathan Overpeck
To: “Michael E. Mann”
Subject: letter to Senate
Date: Tue, 22 Jul 2003 16:49:31 -0700

Cc: Caspar M Ammann , Raymond Bradley , Keith Briffa , Tom Crowley , Malcolm Hughes , Phil Jones ,,,, Tim Osborn , Kevin Trenberth , Tom Wigley


Hi all – I’m not too comfortable with this, and would rather not sign – at least not
without some real time to think it through and debate the issue. It is unprecedented and
political, and that worries me.

My vote would be that we don’t do this without a careful discussion first.

I think it would be more appropriate for the AGU or some other scientific org to do this -
e.g., in reaffirmation of the AGU statement (or whatever it’s called) on global climate

Think about the next step – someone sends another letter to the Senators, then we respond,


I’m not sure we want to go down this path. It would be much better for the AGU etc to do

What are the precedents and outcomes of similar actions? I can imagine a special-interest
org or group doing this like all sorts of other political actions, but is it something for
scientists to do as individuals?

Just seems strange, and for that reason I’d advise against doing anything with out real
thought, and certainly a strong majority of co-authors in support.

Cheers, Peck

Dear fellow Eos co-authors,
Given the continued assault on the science of climate change by some on Capitol Hill,
Michael and I thought it would be worthwhile to send this letter to various members of
the U.S. Senate, accompanied by a copy of our Eos article.
Can we ask you to consider signing on with Michael and me (providing your preferred
title and affiliation). We would like to get this out ASAP.
Thanks in advance,
Michael M and Michael O


Professor Michael E. Mann
Department of Environmental Sciences, Clark Hall
University of Virginia
Charlottesville, VA 22903
e-mail: Phone: (434) 924-7770 FAX: (434) xxx-xxxxx

Attachment converted: Macintosh HD:EOS.senate letter-final.doc (WDBN/MSWD) (00055FCF)

Jonathan T. Overpeck
Director, Institute for the Study of Planet Earth
Professor, Department of Geosciences
Mail and Fedex Address:
Institute for the Study of Planet Earth
715 N. Park Ave. 2nd Floor
University of Arizona
Tucson, AZ 85721
direct tel: +xxxx

fax: +1 520 792-8795

It appears that the proverbial Climate Science Cat is out of the bag.


Developing story – more later

UPDATE1: Steve McIntyre posted this on Climate Audit, I used a screen cap rather than direct link because CA is overloaded and slow at the moment.

UPDATE2: Response from CRU h/t to WUWT reader “Nev”

The director of Britain’s leading Climate Research Unit, Phil Jones, has told Investigate magazine’s TGIF Edition tonight that his organization has been hacked, and the data flying all over the internet appears to be genuine.

In an exclusive interview, Jones told TGIF, “It was a hacker. We were aware of this about three or four days ago that someone had hacked into our system and taken and copied loads of data files and emails.”

“Have you alerted police”

“Not yet. We were not aware of what had been taken.”

Jones says he was first tipped off to the security breach by colleagues at the website RealClimate.

“Real Climate were given information, but took it down off their site and told me they would send it across to me. They didn’t do that. I only found out it had been released five minutes ago.”

TGIF asked Jones about the controversial email discussing “hiding the decline”, and Jones explained what he was trying to say….

UPDATE3: McIntyre has posted an article by Jean S at which is terribly overloaded. We have mirrored it.

TOPICS: Crime/Corruption; Extended News; Foreign Affairs; News/Current Events
KEYWORDS: academicbias; blacklist; climategate; criminalconspiracy; eastanglia; globalwarminghoax; globalwarmingscare; junkscience; pseudoscience; redistributionscam

1 posted on 11/19/2010 11:46:41 AM PST by Ernest_at_the_Beach
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To: NormsRevenge; steelyourfaith; Grampa Dave; SierraWasp; tubebender; Carry_Okie; Brad's Gramma; ...

Memories ping!

2 posted on 11/19/2010 11:48:02 AM PST by Ernest_at_the_Beach ( Support Geert Wilders)
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To: Ernest_at_the_Beach
Chris Horner Climate Realist is a hero for exposing the scam long ago.

There is so much information against this hoax. I hope blowing up the schoolchildren in the “No Pressure” PSA has dealt the Death blow to this foolishness.

The local paper still quacks on about AGW, but it seems that most people do not believe it anymore.

3 posted on 11/19/2010 11:51:49 AM PST by PATRIOT1876 (Language, Borders, Culture, Full employment for those here legally)
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To: Ernest_at_the_Beach

Ahhh, that was beautiful wasn’t it. I’d like to buy that person a few shots.

4 posted on 11/19/2010 11:57:36 AM PST by wheresmyusa (FTUN)
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To: Ernest_at_the_Beach
And one year later: November 17, 2010, NY Times

Cap-and-Trade Exchange Calls It Quits

The only national carbon cap-and-trade exchange in the United States is shutting down because of Congressional inaction on limiting emissions, company officials say.

The Chicago Climate Exchange is a voluntary but legally binding greenhouse gas emissions allowance trading system modeled after a federal cap-and-trade program from the 1980s that successfully curbed emissions tied to acid rain

5 posted on 11/19/2010 12:00:43 PM PST by TexasCajun
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To: TexasCajun; wheresmyusa; PATRIOT1876
And now we have this from a UN official:

IPCC Official: “Climate Policy Is Redistributing The World’s Wealth”

And I add that is the intent of the Global Warming Hoax!

****************************************EXCERPT INTRO******************************************

Climate policy has almost nothing to do anymore with environmental protection, says the German economist and IPCC official Ottmar Edenhofer. The next world climate summit in Cancun is actually an economy summit during which the distribution of the world’s resources will be negotiated. – Ottmar Edenhofer

For those who may not know, Ottmar Edenhofer is the co-chair of the IPCC Working Group III.

6 posted on 11/19/2010 12:08:38 PM PST by Ernest_at_the_Beach ( Support Geert Wilders)
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To: Ernest_at_the_Beach

Remember it well. ;-)

I still have the info saved on my hard drive somewhere.

7 posted on 11/19/2010 12:08:59 PM PST by RushIsMyTeddyBear (Not under the influence of Hope-nosis.)
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To: TexasCajun

That was a nice anniversary present.

8 posted on 11/19/2010 12:11:20 PM PST by IrishCatholic (No local Communist or Socialist Party Chapter? Join the Democrats, it's the same thing!)
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To: Ernest_at_the_Beach
Another thread :

UN’s Ideal – Global Government ( with funding via carbon credits )

9 posted on 11/19/2010 12:11:22 PM PST by Ernest_at_the_Beach ( Support Geert Wilders)
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To: Ernest_at_the_Beach

climate change has made al gore and several other rich..just like green products. its just to get money

10 posted on 11/19/2010 12:33:32 PM PST by dalebert
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To: Ernest_at_the_Beach
Edenhofer does have a book coming....:

The Economics of Climate Change in China: Towards a Low Carbon Economy [Hardcover]

pricey book.

11 posted on 11/19/2010 12:35:06 PM PST by Ernest_at_the_Beach ( Support Geert Wilders)
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To: Ernest_at_the_Beach
I went out and bought a bottle of very good champagne.
12 posted on 11/19/2010 12:35:38 PM PST by Excellence (Buy Progresso, take off the label, write "not halal," mail to Campbell's soup company.)
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To: Ernest_at_the_Beach
And by Dec 2009 we have this entry at Climate Audit regarding the "Hide the Decline":

A href=>IPCC and the “Trick”

******************************************EXCERPT INTRO**********************************

Much recent attention has been paid to the email about the “trick” and the effort to “hide the decline”. Climate scientists have complained that this email has been taken “out of context”. In this case, I’m not sure that it’s in their interests that this email be placed in context because the context leads right back to a meeting of IPCC authors in Tanzania, raising serious questions about the role of IPCC itself in “hiding the decline” in the Briffa reconstruction.

Relevant Climategate correspondence in the period (September-October 1999) leading up to the trick email is incomplete, but, in context, is highly revealing. There was a meeting of IPCC lead authors between Sept 1-3, 1999 to consider the “zero-order draft” of the Third Assessment Report. The emails provide clear evidence that IPCC had already decided to include a proxy diagram reconstructing temperature for the past 1000 years and that a version of the proxy diagram was presented at the Tanzania meeting showing the late twentieth century decline. I now have a copy of the proxy diagram presented at this meeting (see below).

The emails show that the late 20th century decline in the Briffa reconstruction was perceived by IPCC as “diluting the message”, that “everyone in the room at IPCC” thought that the Briffa decline was a “problem” and a “potential distraction/detraction”, that this was then the “most important issue” in chapter 2 of the IPCC report and that there was “pressure” on Briffa and other authors to show a “nice tidy story” of “unprecedented warming in a thousand years or more”. [Update Dec 11 - see note at bottom on the chronology. Comments from readers have clarified that the issue at the Arusha meeting was that the Briffa reconstruction "diluted the message" more through its overall inconsistency as opposed to the decline, which was still relatively attenuated in the Arusha version. After the Arusha meeting, Briffa hastily re-calculated his reconstruction sending a new version to Mann on Oct 5, 1999 and it was this hastily re-done version that introduced the very severe decline that was hidden in the First Order Draft and Jones WMO Report]

The chronology in today’s posts show that the version of the Briffa reconstruction shown in the subsequent proxy diagram in the IPCC “First Order Draft” (October 27, 1999), presumably prepared under the direction of IPCC section author Mann, deleted the inconvenient portion (post-1960) of the Briffa reconstruction, together with other modifications that had the effect of not “diluting the message”.

About two weeks later (Nov 16, 1999) came the now infamous Jones email reporting the use of “Mike’s Nature trick” to “hide the decline” in a forthcoming WMO (World Meteorological Organization) report. Jones’ methodology is different than the IPCC methodology. Jones’ trick has been described in previous posts.

Today, I’ll describe both the context of the IPCC version of the “trick” and progress to date in reverse engineering the IPCC trick.

IPCC Lead Authors’ Meeting, Sept 1999
IPCC Lead Authors met in Arusha, Tanzania from September 1 to 3, 1999 (see Houghton, 929985154.txt and 0938018124.txt), at which the final version of the “zero-order” draft of the Third Assessment Report was presented and discussed. The “First-Order Draft” was sent out to reviewers two months later (end of October 1999).

By this time, IPCC was already structuring the Summary for Policy-makers and a proxy diagram showing temperature history over the past 1000 years was a “clear favourite”.

A proxy diagram of temperature change is a clear favourite for the Policy Makers summary. (Folland, Sep 22, 1999, in 0938031546.txt)

This desire already placed “pressure” on the authors to “present a nice tidy story” about “unprecedented warming in a thousand years”:

I know there is pressure to present a nice tidy story as regards ‘apparent unprecedented warming in a thousand years or more in the proxy data’ …(Briffa, Sep 22, 1999, 0938031546.txt)

The “zero-order” draft (their Figure 2.3.3a as shown below) showed a version of the Briffa reconstruction with little variation and a noticeable decline in the late 20th century.

Figure 1. IPCC Third Assessment Report Zero-Order Draft Figure 2.3.3a Comparison of millennial Northern Hemisphere (NH) temperature reconstructions from different investigators (Briffa et al, 1998; Jones et al, 1998; Mann et al, 1998;1999a)… All the series were filtered with a 40 year Gaussian filter. The problematic Briffa reconstruction is the yellow series.

No minutes of this meeting are available, but Climategate correspondence on Sep 22-23, 1999 provides some contemporary information about the meeting. Mann noted that “everyone in the room at IPCC was in agreement that the [decline in the Briffa reconstruction] was a problem”:

Keith’s series… differs in large part in exactly the opposite direction that Phil’s does from ours. This is the problem we all picked up on (everyone in the room at IPCC was in agreement that this was a problem and a potential distraction/detraction from the reasonably concensus viewpoint we’d like to show w/ the Jones et al and Mann et al series. (Mann, Sep 22, 1999, 0938018124.txt)

IPCC Chapter Author Folland of the U.K. Hadley Center wrote to Mann, Jones and Briffa that the proxy diagram was a “clear favourite” for the Summary Policy-makers, but that the existing presentation showing the decline of the Briffa reconstruction “dilutes the message rather significantly”. After telling the section authors about the stone in his shoe, Folland added that he only “wanted the truth”.

A proxy diagram of temperature change is a clear favourite for the Policy Makers summary. But the current diagram with the tree ring only data [i.e. the Briffa reconstruction] somewhat contradicts the multiproxy curve and dilutes the message rather significantly. [We want the truth. Mike thinks it lies nearer his result (which seems in accord with what we know about worldwide mountain glaciers
and, less clearly, suspect about solar variations). The tree ring results may still suffer from lack of multicentury time scale variance. This is probably the most important issue to resolve in Chapter 2 at present..(Folland, Sep 22, 1999, in 0938031546.txt)

Climategate Letters, Sep 22-23, 1999

The Climategate Letters contain a flurry of correspondence between Mann, Briffa, Jones and Folland (copy to Tom Karl of NOAA) on Sep 22-23, 1999, shedding light on how the authors responded to the stone in IPCC’s shoe. By this time, it appears that each of the three authors (Jones, Mann and Briffa) had experimented with different approaches to the “problem” of the decline.

Jones appears to have floated the idea of using two different diagrams - one without the inconvenient Briffa reconstruction (presumably in the Summary for Policy-makers) and one with the Briffa reconstruction (presumably in the relevant chapter). Jones said that this might make it “somewhat awkward for the reader trying to put them into context”, with it being unclear whether Jones viewed this as an advantage or disadvantage:

If we go as is suggested then there would be two diagrams - one simpler one with just Mann et al and Jones et al and in another section Briffa et al. This might make it somewhat awkward for the reader trying to put them into context. (Jones, Sep 22, 1999 Jones 093801949)

Another approach is perhaps evidenced in programming changes a week earlier (Sep 13-14, 1999), in which programs in the osborn-tree6/mann/oldprog directory appear to show efforts to “correct” the calibration of the Briffa reconstruction, which may or may not be relevant to the eventual methodology to “hide the decline”.

The correspondence implies (though this is at present not proven) that IPCC section author Mann’s first reaction to the “problem” was to totally delete the Briffa reconstruction from the proxy diagram, as the correspondence of September 22 seems to have been precipitated by Briffa being unhappy at an (unseen) version of the proxy diagram in which his reconstruction had been deleted.

Briffa’s length email of Sep. 22, 19990 (938031546.txt) should be read in full. Briffa was keenly aware of the pressure to present a “nice tidy story” of "unprecedented warming", but is worried about the proxy evidence:

I know there is pressure to present a nice tidy story as regards 'apparent unprecedented warming in a thousand years or more in the proxy data' but in reality the situation is not quite so simple… [There are] some unexpected changes in response that do not match the recent warming. I do not think it wise that this issue be ignored in the chapter. (Briffa, Sep 22, 1999, 0938031546.txt)

He continued:

For the record, I do believe that the proxy data do show unusually warm conditions in recent decades. I am not sure that this unusual warming is so clear in the summer responsive data. I believe that the recent warmth was probably matched about 1000 years ago. I do not believe that global mean annual temperatures have simply cooled progressively over thousands of years as Mike appears to and I contend that that there is strong evidence for major changes in climate over the Holocene (not Milankovich) that require explanation and that could represent part of the current or future background variability of our climate. (Briffa, Sep 22, 1999, 0938031546.txt)

Thus, when Mann arrived at work on Sep 22, 1999, Mann observed that he had walked into a “hornet’s nest”. (Mann Sep 22, 1999, 0938018124.txt). In an effort to resolve the dispute, Mann said that (subject to the agreement of Chapter Authors Karl and Folland) he would add back Briffa’s reconstruction, but pointed out that this would present a “conundrum”:

So if Chris[Folland] and Tom [Karl] are ok with this, I would be happy to add Keith’s series. That having been said, it does raise a conundrum: We demonstrate [through comparining an exatropical averaging of our nothern hemisphere patterns with Phil's more extratropical series) that the major discrepancies between Phil's and our series can be explained in terms of spatial sampling/latitudinal emphasis (seasonality seems to be secondary here, but probably explains much of the residual differences). But that explanation certainly can't rectify why Keith's series, which has similar seasonality *and* latitudinal emphasis to Phil's series, differs in large part in exactly the opposite direction that Phil's does from ours.] This is the problem we all picked up on (everyone in the room at IPCC was in agreement that this was a problem and a potential distraction/detraction from the reasonably concensus viewpoint we’d like to show w/ the Jones et al and Mann et al series. (Mann Sep 22, 0938018124.txt

Mann went on to say that the skeptics would have a “field day” if the declining Briffa reconstruction were shown and that he’d “hate to be the one” to give them “fodder”:

So, if we show Keith’s series in this plot, we have to comment that “something else” is responsible for the discrepancies in this case. [Perhaps Keith can help us out a bit by explaining the processing that went into the series and the potential factors that might lead to it being "warmer" than the Jones et al and Mann et al series?? We would need to put in a few words in this regard] Otherwise, the skeptics have an field day casting doubt on our ability to understand the factors that influence these estimates and, thus, can undermine faith in the paleoestimates. I don’t think that doubt is scientifically justified, and I’d hate to be the one to have to give it fodder! (Mann Sep 22, 0938018124.txt)

By the following day, matters seem to have settled down, with Briffa apologizing to Mann for his temporary pangs of conscience. On Oct 5, 1999, Osborn (on behalf of Briffa) sent Mann a revised version of the Briffa reconstruction with more “low-frequency” variability (Osborn, Oct 5, 1999, 0939154709.txt), a version that is identical up to 1960, this version is identical to the digital version archived at NCDC for Briffa et al (JGR 2001). (The post-1960 values of this version were not “shown” in the version archived at NCDC; they were deleted.)

As discussed below, this version had an even larger late-20th century decline than the version shown at the Tanzania Lead Authors’ meeting. Nonetheless, the First Order Draft (Oct 27, 1999) sent out a few weeks later contained a new version of the proxy diagram (Figure 2.25), a version which contains the main elements of the eventual Third Assessment Report proxy diagram (Figure 2.21). Two weeks later came Jones’ now infamous “trick” email (0942777075.txt).

The IPCC Trick

Mann’s IPCC trick is related to the Jones’ trick, but different. (The Jones trick has been explained in previous CA posts here, here and consists of replacing the tree ring data with temperature data after 1960 – thereby hiding the decline – and then showing the smoothed graph as a proxy reconstruction.) While some elements of the IPCC Trick can be identified with considerable certainty, other elements are still somewhat unclear.

The diagram below shows the IPCC version of the Briffa reconstruction (digitized from the IPCC 2001) compared to actual Briffa data from the Climategate email of October 5, 1999, smoothed using the methodology said to have been used in the caption to the IPCC figure (a 40 year Hamming filter with end-point padding with the mean of the closing 20 years).

Figure 3. Versions of the Briffa Reconstruction in controversy, comparing the original data smoothed according to the reported methodology to a digitization of the IPCC version.

Clearly, there are a number of important differences between the version sent to Mann and the version that appeared in the IPCC report. The most obvious is, of course, that the decline in the Briffa reconstruction has, for the most part, been deleted from the IPCC proxy diagram. However, there are some other frustrating inconsistencies and puzzles that are all too familiar.

There are some more technical inconsistencies that I’ll record for specialist readers. It is very unlikely that that the IPCC caption is correct in stating that a 40-year Hamming filter was used. Based on comparisons of the MBH reconstruction and Jones reconstruction, as well as the Briffa reconstruction, to versions constructed from raw data, it appears that a Butterworth filter was used – a filter frequently used in Mann’s subsequent work (a detail that, in addition, bears on the authorship of the graphic itself).

Second, the IPCC caption stated that “boundary constraints imposed by padding the series with its mean values during the first and last 25 years.” Again, this doesn’t seem to reconcile with efforts to replicate the IPCC version from raw data. It appears far more likely to me that each of the temperature series has been padded with instrumental temperatures rather than the mean values of the last 25 years.

Finally, there are puzzling changes in scale. The underlying annual data for the Jones and Briffa reconstructions are expressed in deg C (basis 1961-1990) and should scale simply to the smoothed version in the IPCC version, but don’t quite. This may partly derive from errors introduced in digitization, but is a loose end in present replication efforts.

The final IPCC diagram (2.21) is shown below. In this rendering, the Briffa reconstruction is obviously no longer “a problem and a potential distraction/detraction”and does not “dilute the message”. Mann has not given any “fodder” to the skeptics, who obviously did not have a “field day” with the decline.

IPCC Third Assessment Report Figure 2.21: Comparison of warm-season (Jones et al., 1998) and annual mean (Mann et al., 1998, 1999) multi-proxy-based and warm season tree-ring-based (Briffa, 2000) millennial Northern Hemisphere temperature reconstructions. The recent instrumental annual mean Northern Hemisphere temperature record to 1999 is shown for comparison. Also shown is an extra-tropical sampling of the Mann et al. (1999) temperature pattern reconstructions more directly comparable in its latitudinal sampling to the Jones et al. series. The self-consistently estimated two standard error limits (shaded region) for the smoothed Mann et al. (1999) series are shown. The horizontal zero line denotes the 1961 to 1990 reference period mean temperature. All series were smoothed with a 40-year Hamming-weights lowpass filter, with boundary constraints imposed by padding the series with its mean values during the first and last 25 years.

Contrary to claims by various climate scientists, the IPCC Third Assessment Report did not disclose the deletion of the post-1960 values. Nor did it discuss the “divergence problem”. Yes, there had been previous discussion of the problem in the peer-reviewed literature (Briffa et al 1998) – a point made over and over by Gavin Schmidt and others. But not in the IPCC Third Assessment Report. Nor was the deletion of the declining values reported or disclosed in the IPCC Third Assessment Report. [Dec 11.- IPCC TAR does contain a sly allusion to the problem; it mentions "evidence" that tree ring density variations had "changed in their response in recent decades". Contrary to claims of realclimate commenters, this does not constitute disclosure of the deletion of the post-1960 values in the controversial figure or even of the decline itself.] The hiding of the decline was made particularly artful because the potentially dangling 1960 endpoint of the Briffa reconstruction was hidden under other lines in the spaghetti graph as shown in the following blow-up:

Figure. Blow-up of IPCC Third Assessment Report Fig 2-21.

To my knowledge, no one noticed or reported this truncation until my Climate Audit post in 2005 here. The deletion of the decline was repeated in the 2007 Assessment Report First Order and Second Order Drafts, once again without any disclosure. No dendrochronologist recorded any objection in the Review Comments to either draft. As a reviewer of the Second Order Draft, I asked the IPCC in the strongest possible terms to show the decline reported at CA here:

Show the Briffa et al reconstruction through to its end; don’t stop in 1960. Then comment and deal with the “divergence problem” if you need to. Don’t cover up the divergence by truncating this graphic. This was done in IPCC TAR; this was misleading. (Reviewer’s comment ID #: 309-18)]

They refused, stating that this would be “inappropriate”, though a short discussion on the divergence was added – a discussion that was itself never presented to external peer reviewers.

Returning to the original issue: climate scientists say that the “trick” is now being taken out of context. The Climategate Letters show clearly that the relevant context is the IPCC Lead Authors’ meeting in Tanzania in September 1999 at which the decline in the Briffa reconstruction was perceived by IPCC as “diluting the message”, as a “problem”, as a “potential distraction/detraction”. A stone in their shoe.

Update (Dec 11) : Some of the follow-up comments on this post do shed light on this sequence and enable a more precise interpretation of the emails. With the benefit of these comments, there are a couple of points on the chronology that I need to modify, particularly in respect to the role of the October 5 revision of the Briffa reconstruction in respect both to the Arusha meeting and to the hide the decline.

The Arusha meeting objected to the Briffa reconstruction “diluting the message” and reducing confidence in the multiproxy reconstructions. And, of course, it is the overstated confidence that has been the primary objection here. However, I agree with critics who observe that the proximate objection to the Briffa reconstruction at Arusha was not that the decline per se diluted the message, but the Briffa reconstruction overall diluted the message and interfered with a “tidy story”. The stone in the shoe was that the Briffa reconstruction prevented a “tidy story”; the “decline” as a separate problem came a bit later.

After the Arusha meeting, Briffa hurriedly re-did his chronology and the new version was delivered to Mann on Oct 5, 1999 – it was this version that had the big decline. In the First Order Draft of Oct 27, 1999, IPCC author Mann deleted the post-1960 portion of the Briffa reconstruction plus other things that I don’t yet quite understand. Jones’ trick, as observed in the post, is a little different. (The post-1960 portion of the Briffa reconstruction was also deleted from the NCDC archive and the Climategate Letters, as previously noted, was the first digital “archive” of the post-1960 Briffa reconstruction used in TAR.)

As of Oct 5, 1999, the revised Briffa reconstruction had not been presented in any peer-reviewed literature but nonetheless was adopted by IPCC. The hasty recalculation of the Briffa reconstruction resulted in a big decline in the late 20th century – this is the decline illustrated in the graphic in my post.

In the First Order Draft of late October 1999, IPCC did not show the decline. In the Jones trick email two weeks later, as noted above, Jones hid the decline in a slightly different way.

Another issue raised by readers pertains to quotations. The post was already long and I tried to keep the quotations relatively concise. Some readers have criticized the ellipsis. I’ve accordingly amended the quotations (amendments in square brackets.)

This entry was written by Steve McIntyre, posted on Dec 10, 2009 at 6:50 PM

13 posted on 11/19/2010 12:45:42 PM PST by Ernest_at_the_Beach ( Support Geert Wilders)
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To: Excellence
A Good move....California Vintners thank You!

Any consumption helps reduce the surplus.

14 posted on 11/19/2010 12:49:16 PM PST by Ernest_at_the_Beach ( Support Geert Wilders)
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To: Ernest_at_the_Beach

“Hide the decline” that one simple statement of fact, destroyed years of planning and scheming to rob industrialized countries of their wealth. Thank God, that someone posted those insightful documents on a server in Russia. Truth is hard to hide with a fishnet of lies.
We must purge these thieves out of our government who uses this silly hoax as a excuse to rob us.
United Nations should be cast out of this country. I suggest the Canary Islands or Madagascar. Get them off our soil, cancer can’t be negotiated with it must be cut out.

15 posted on 11/19/2010 12:56:56 PM PST by Doulos1 (Bitter Clinger Forever!)
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To: Ernest_at_the_Beach

A tip of the hat to the hackers! ;)

16 posted on 11/19/2010 1:20:55 PM PST by SouthTexas (WE are the Wave)
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To: Ernest_at_the_Beach; Clive; scripter; Darnright; WL-law; bamahead; carolinablonde; SolitaryMan; ...

Beam me to Planet Gore !

17 posted on 11/19/2010 3:24:27 PM PST by steelyourfaith (ObamaCare Death Panels: a Final Solution to the looming Social Security crisis ?)
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To: Ernest_at_the_Beach

The pro-AGW frauds are still not in prison, but it is nice to smile about this again.

18 posted on 11/19/2010 4:45:15 PM PST by SunkenCiv (The 2nd Amendment follows right behind the 1st because some people are hard of hearing.)
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To: Ernest_at_the_Beach
"Memories ping!"
I have been away from FR boards as well as most of the Internet for a bit. Lots of things that had to get done recently.
I was among those that November that downloaded and unziped that huge file package and started to shift through a lot of the damaging info contained. It is interesting the original "who" that made the stuff available still has not been found.
That is good. I still think it was an inside job, someone close to the admin level, perhaps a root level user who allowed the stuff to be grabbed off a given server.
But what the heck. The main thing is it came to past.
It made a lot of criminals across spectrum involved start to squirm.
19 posted on 11/23/2010 12:15:09 PM PST by Marine_Uncle (Honor must be earned....)
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