Category Archives: MBH98

Articles relating to the Mann, Bradley and Hughes 1998 reconstruction of past climate

The MBH99 CO2 "Adjustment"

We’ve all had enough experience with the merry adjusters to know that just because someone “adjusts” something doesn’t necessarily mean that the adjustment makes sense. A lot of the time, the adjuster arm waves through the documentation and justification of the adjustment. Today I’m going to work through aspects of one of the most problematic […]

The Gift That Keeps On Giving

As I mentioned before, Hans Erren’s digitization of the Ababneh Sheep Mountain data has prompted me to pick up the MBH files to re-examine the vexed matter of Mann’s CO2 “adjustment”. Each step is fraught with problems. I’m going to try to pull something together listing the steps in the adjustment and the issues involved […]

Al Gore and "Dr Thompson's Thermometer" #2

Yesterday, I posted up about “Dr Thompson’s Thermometer” and, thanks to CA readers, some interesting results emerged. A special thanks to Tim Lambert for spotting the provenance of Dr Thompson’s thermometer. The post today will repeat some of yesterday’s material, but will recast it, since we now understand the puzzle much better. In Inconvenient Truth, […]

Al Gore and Dr Thompson's Thermometer

Surprisingly, I don’t think that I’ve written previously about the Al Gore Hockey Stick. In Inconvenient Truth, after a segment discussing glaciers, Gore stands in front of a Hockey Stick graph for the last 1000 years and tells his audience that “Dr Thompson’s thermometer” had shown the inconsequentiality of the Medieval Warm Period and, [in […]

David Holland on the Hockey Stick Affair

David Holland has a new and interesting article entiitled “Bias And Concealment In The IPCC Process: The “Hockey-Stick” Affair And Its Implications” in which the proprietor of this blog is mentioned on occasion.

The Wegman and North Reports for Newbies

In recent discussion of the Weblog 2007 Awards, several commenters at other blogs have argued that our criticisms of the Mannian parlor tricks have been “thoroughly refuted and discarded by climatologists, published in a credible journal”; that “other professionals in the field who also have “looked in great detail at the problem at hand” and […]

What other data series could be plugged in?

I recommend that CA readers visit UC’s blog for some interesting discussion. (BTW UC visited Toronto recently and we had a nice dinner.) UC posted the following interesting figure on Unthreaded as follows: BTW, got interesting result when I replaced Temperature PCs with solar in MBH98 algorithm. Similar RE values as in the original, and […]

IPCC AR4 and the Return of Chucky – He’s Baaack!

Here’s something I meant to post up when AR4 came out. I was reminded of this when Rob Wilson posted recently: Lastly, lets not forget that TR based reconstructions of NH temperatures exist that do not use Bristlecone pine or Foxtail data. Rob’s point here is very disingenuous (to use Mann-speak) since millennial reconstructions are […]

A Little Secret

Don’t you think that someone on the Team might have been a little curious as to what bristlecone ring widths have done during the past 25 years? For this, we have the classic excuse of Michael Mann and the Team for not updating bristlecone and proxy records is that it’s not practical within the limited […]

MBH Proxies in Bo Li et al

We have a new article from the Mannian school, this time involving supposedly “independent” NAS panelist, Doug Nychka, and geologist Caspar Ammann, who is very enthusiastic about calculating covariances using Mannian proxies. The lead author is a statistician, Bo Li. The article purports to use MBH99 proxies and says we do not critically evaluate these […]