Comments on: Graumlich Archives Two Foxtail Series

By: Steve Sadlov

Steve Sadlov — Fri, 19 May 2006 03:44:39 +0000

Scratch that last comment, I was thinking Boreal Plateau was Boreal Ridge. I saw my mistake when I looked at the coordinates in the June thread.

By: Steve Sadlov

Steve Sadlov — Fri, 19 May 2006 03:41:25 +0000

Minor observation. In modern times (at least, since my childhood) Boreal Plateau has been a place of very, very high snowfall. Some of the highest I’ve seen anywhere on earth. It is also one of the lesser disected blocks up at the Sierra crest. A very interesting place.

By: jae

jae — Thu, 18 May 2006 18:09:04 +0000

Hey, Steve: did you ever audit a promotion that had as many deficiencies as these HS studies?

By: Steve McIntyre

Steve McIntyre — Wed, 17 May 2006 19:43:59 +0000

The standardization methods would be different. Graumlich probably did “conservative” standardization i.e. detrending each core individually with a neg-exp curve, while Esper may have done RCS in which he detrended using one curve for all series.

The existence of such differences is evidence (if any were needed) why one needs to see Briffa’ measurement data and simply providing a “chronology” for Tornetrask, Taimyr etc, is insufficient.

Thes series are very important in contributing to the medieval-modern difference in Esper. Can anyone give me a good reason why Esper needs TWO foxtail series when he only has 14 series to cover the entire NH?

Also the average of these two series (Esper version) is used by Osborn and Briffa 2006, where is is one of the 2 strongest contributors to 20th century anomalies. (The other, of course, is Mann’s PC1 dominated by bristlecones about 50 km away.) Again can anyone give me a good reason why Osborn and Briffa need TWO of these series out of 14 to cover the entire NH?

By: Willis Eschenbach

Willis Eschenbach — Wed, 17 May 2006 19:33:53 +0000

The differences in the series are far from insignificant.

a) In both series, the 1800-2000 slope is much larger in the Esper version.

b) In the Boreal Plateau series, the overall trend is upwards in the Esper version, and downwards in the Graumlich version.

c) In the Upper Wright Lake series, the Graumlich version is consistently smaller than the Esper version.

Overall, the match is very poor. I am hard pressed to think of a reason that these two would be that different.

By: John A

John A — Wed, 17 May 2006 19:22:18 +0000

And they’re not exactly copies of each other are they?

By: John Lish

John Lish — Wed, 17 May 2006 17:31:46 +0000

2 down, 5 to go then. At least it is encouraging that the WDCP is now being used more frequently.