What pushed Judith Curry over the edge?

Serious question. Look, we've all known that Judith has been getting more and more ratty as time goes on. Just when we think she can't sink any lower she surprises us again.  But this time she's really gone over the edge. I mean really and truly.

I've been a bit busy the last few days and have only just got around to checking out the various denier websites. I was surprised to see Judith Curry (archived here) putting up some old, wacky and long bit of idiocy from John Christy. Back in 2011, John was whining to the House Science, Space and Technology Committee, protesting the IPCC, the northern hemisphere temperature reconstructions pre-2001, and all else besides.

Earth is as cold as a summit in Central Greenland?

At face value John, and therefore Judith, were doing a Denier Don Easterbrook, arguing that the temperature of earth is the same as it is on the top of the summit in Greenland.  John was complaining that a paper by Dahl-Jensen et al (1998) wasn't referred to in Section 2.3.2 in Chapter 2 of TAR, Temperature of the Past 1,000 Years. Yes, they are talking about the IPCC WG1 report from 2001, thirteen years ago.  Not the current report, not the 2007 report. The third assessment report from 2001.

Anyway, John complained that instead of discussing the temperature of Greenland's ice sheets over the past 1,000 years as if it represented global temperatures, the authors decided to discuss the temperatures of the whole world over the past 1000 years as far as it was known at the time (weird, huh?).  Turns out that back then (as is still the case to a great extent) there was an emphasis on the northern hemisphere reconstructions because there wasn't a lot of data for the southern hemisphere in 2001.

John Christy even admitted the other authors didn't think much of his idiocy:

To me Dahl-Jensen et al.’s reconstruction was a more robust estimate of past temperatures than one produced from a certain set of western U.S. tree-ring proxies. But as the process stood, the L.A. was not required to acknowledge my suggestions, and I was not able to convince him otherwise. It is perhaps a failure of mine that I did not press the issue even harder or sought agreement from others who might have been likewise aware of the evidence against the Hockey Stick realization.

Note too that there were several paleoclimatologists as lead authors of Chapter 2, so I don't know why John talks about "him" rather than "them". It's a case of the Serengeti Strategy again I guess.

John didn't point out that the paper was referred to in Section 2.4.2, How Stable was the Holocene Climate? Here is the relevant passage (my bold italics):

The early Holocene was generally warmer than the 20th century but the period of maximum warmth depends on the region considered. It is seen at the beginning of the Holocene (about 11 to 10 ky BP) in most ice cores from high latitude regions e.g., north-west Canada (Ritchie et al., 1989), central Antarctica (Ciais et al., 1992; Masson et al., 2000) and in some tropical ice cores such as Huascaran in Peru (Thompson et al., 1995). It is also seen during the early Holocene in the Guliya ice core in China (Thompson et al., 1998) but not in two other Chinese cores (Dunde, Thompson et al., 1989; and Dasuopu, to be published). North Africa experienced a greatly expanded monsoon in the early and mid-Holocene, starting at 11 ky BP (Petit-Maire and Guo, 1996), and declining thereafter. In New Zealand the warmest conditions occurred between about 10 to 8 ky BP, when there was a more complete forest cover than at any other time. Glacial activity was at a minimal level in the Southern Alps and speleothem analyses indicate temperatures were about 2°C warmer than present (Salinger and McGlone, 1989; Williams et al., 1999).

By contrast, central Greenland (Dahl-Jensen et al., 1998), and regions downstream of the Laurentide ice sheet, did not warm up until after 8 ky BP (including Europe: COHMAP Members, 1988; eastern North America: Webb et al., 1993). 

Nor did John Christy point out that the temperature reconstructions described in Chapter 2 of TAR were based on many more proxies than just tree rings.  Nor that there were several reconstructions discussed, not just those of Michael Mann and colleagues. Nor that there were lots of caveats in TAR (as always).

Now the fact that John and Judith think that the summit of Greenland on its own is a proxy for global temperatures is wacky enough and way beyond Judith's usual fare. But she not only put forward John's silliness as if it ought to be taken seriously, she threw in snippets of stolen emails as evidence of something or other.

Not only that, but she resurrected her jealousy of Michael Mann, that he was one of eight lead authors of a chapter in the IPCC's third assessment report, whereas she was but a lowly contributing author of Chapter 7. John Christy was a lead author in the same chapter as Michael Mann, so goodness knows why he and Judith were whinging. (Maybe she was miffed that Michael Mann wasn't just a lead author of Chapter 2, he was also a contributing author of Chapter 7 and Chapter 8.)

I mean we're talking TAR, the third assessment report. Judith is going back thirteen years.

Here is another reason I think Judith has finally lost it for good. She wrote:

Christy’s assessment, when combined with the UEA emails, provides substantial insight into how this hockey stick travesty occurred.  

John Christy's assessment! Climategate! Sheesh, Judith is scraping the bottom of the barrel isn't she.  What will Judith write about next? The fake Oregon Petition?

Here is a sample of John Christy's conspiracy ideation - and this is only a snippet.  There's more of the same where that came from.  Here he is referring to authors of the IPCC reports, writing:

As time went on, nations would tend to nominate only those authors whose climate change opinions were in line with a national political agenda which sought perceived advantages (i.e. political capital, economic gain, etc.) by promoting the notion of catastrophic human-induced climate change. Scientists with well-known alternative views would not be nominated or selected. Indeed, it became more and more difficult for dissention and skepticism to penetrate the process now run by this establishment. As noted in my IAC testimony, I saw a process in which L.A.s were transformed from serving as Brokers of science (and policy-relevant information) to Gatekeepers of a preferred point of view. 

John Christy is so deluded as to think that politicians throughout the world will gain economically and politically as a result of global warming. Tell that to Kevin Rudd and Julia Gillard! Tell that to Tony Abbott! Tell that to the James Inhofe and the GOP!

And what "hockey stick travesty"? The hockey stick keeps showing up in all the subseqent IPCC reports.  This is from the latest AR5:

Box TS5 Fig 1 Source: IPCC AR5 WG1 

Doesn't Judith know what the current instrumental record shows compared to the Holocene as a whole?  I don't believe it. She has subsequently written an article about the recent Neukom paper under a weird title: "The inconvenient southern hemisphere".  In that article she "rebuts" the paper by referring her readers to, of all places, WUWT! Yep. She's well and truly gone over the edge. Here is Figure 2 from that paper - guess what it shows. You guessed it, a hockey stick:

Figure 2 Temperature variability over the past millennium. a, 30-year loess filtered ensemble mean temperature reconstruction for the Southern Hemisphere (SH; blue) and Northern Hemisphere (NH; red) relative to the millennium mean for the period 1000–2000. Blue shading based on Southern Hemisphere reconstruction uncertainties (Supplementary Section 2.4). Thin orange lines represent the ensemble means of the nine individual temperature reconstructions making up the Northern Hemisphere dataset5. b, as a but for the 24-member climate model ensemble. Note for consistency with reconstruction data, simulated temperatures are shown as individual simulations for the Northern Hemisphere and a probabilistic range based on ensemble percentiles for the Southern Hemisphere.

Source: Neukom14

Back to basic Curry - the IPCC and Michael Mann

For once Judith isn't being her usual ambiguous self.  She is up front about her motivation. She has it in for Michael Mann and the IPCC. She has ever since I first heard of her - when she "came out" as a denier on Keith Kloor's blog way back when.  This is what she wrote the other day:

Back in April 2011, I had a post on The U.S. House of Representatives Hearing on Climate Change: Examining the Processes Used to Create Science and Policy.  John Christy’s testimony is worth revisiting, in two contexts:

• problems with the IPCC process, most recently highlighted in context of WG3 [link]
• the Steyn versus Mann and Mann versus Steyn lawsuits [link]

So she's back to basics - Judith Curry waging a war on the IPCC and Michael Mann. That's bare bones Judith Curry - in a nutshell. Forget science. Forget politics. For Judith, this is personal.

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Neukom, Raphael, Joëlle Gergis, David J. Karoly, Heinz Wanner, Mark Curran, Julie Elbert, Fidel González-Rouco et al. "Inter-hemispheric temperature variability over the past millennium." Nature Climate Change 4, no. 5 (2014): 362-367. doi:10.1038/nclimate2174