Here’s an example of how one can wander off curious little by-ways in trying to replicate Hockey Team materials. I’m working on the seemingly simple task of testing the correlations to gridcell temperature in Osborn and Briffa 2006. One of the series – a "quiet" series – is Fisher’s "West Greenland dO18 Stack". Also with […]
Rutherford et al 2005 (the et al being half the Hockey Team: Mann, Bradley, Hughes, Briffa, Jones, Osborn) is a re-statement of the MBH98 network (flawed PCs and all) and the Briffa et al 2001 network using RegEM. I haven’t figured out exactly what the properties of the RegEM method are as compared to other […]
Mann and Jones have a new post at realclimate discussing warmth at Svalbard, an island archipelago north of Norway. May temperatures are very warm there. They say that the differences are 5 standard deviations based in i.i.d. We’ve talked about the inappropriateness of i.i.d. assumptions in the context of Rasmus (BTW what ever happened to […]
The two “lost” Graumlich foxtail series used in Esper et al 2002 were archived today at WDCP. Only the specific series that I had requested were archived; other series in Bunn et al 2005 were not archived – see prior discussion here. UPDATE May 17: Graumlich also archived two chronologies (Boreal -ca636.crn; Upper Wright – […]
Kultti et al. [Holocene 2006] has just been published in Holocene, showing higher medieval treeelines in northern Finland (27 deg E). This is consistent with the more northerly distribution of oak in medieval Finland reported in Hulden [2001] discussed here and adds to the growing inventory of articles both demonstrating higher medieval treelines and using […]
I’m actually looking into the WDCP updates page more regularly now to see if any new information has been archived. Five more Jacoby data sets have been archived in the past week: one from the Yukon, 4 from Mongolia. There are still far more that have not been archived than have been archived, but that […]
During the past 20 years, Jacoby and D’Arrigo had obtained over 45 RW series and at least 35 MXD series in North America. To the end of 2005, despite receiivng millions in grants, he had only archived a couple of North American RW series and no North American MXD series. I discussed this before here, […]
I mentioned a couple of days ago that Schweingruber et al [1993] seems to arrive at opposite conclusions to Jacoby and D’Arrigo [1989] as to whether anomalous post-1950 ring widths occur (let alone whether that is due to CO2 fertilization or temperature.) It was interesting to compare Schweingruber-Kienast results at Niwot Ridge. It turns out […]
Reviewing the bidding: at Niwot Ridge, a short drive from UCAR world headquarters, we have disparate chronologies from Graybill and Woodhouse for limber pine at similar elevations (with Graybill’s chronology also discrepant from nearby chronologies from Kienast and Schweingruber for very close PCEN series). Despite the disparate appearances, the correlation between the Graybill and Woodhouse […]
As I mentioned earlier today, Niwot Ridge is about 45 minutes drive from UCAR headquarters in Boulder (which hosts the IPCC WG1 TSU). I’ve identified 5 archived chronologies from Niwot Ridge, including two chronologies discussed in Kienast and Luxmoore 1988 as contradicting Graybill’s claims of enhanded post-1950 growth. Graumlich 1991 distinguished the two studies on […]
Climate Audit 