A couple of days ago, I canvassed the ITRDB data bank for all tree ring series with values later than 1998, noting that there were many new series. Mann has justified the reliance on proxies not updated since 1980 and earlier, and thus not calibrated against recent warmth, on the basis that it is very […]
Two respected dendrochronologists wrote in criticizing my recent post averaging new white spruce chronology contributions to the ITRDB data bank. [Update: see post here with further thoughts on the location of this site. Next post in category] Rob Wilson wrote, using an uncharacteristic Gavin-esque sigh, as follows:
I wa reading through Rob Wilson’s article on Gulf of Alaska ring widths and the following sentence caught my eye: Mean temperature data for Sitka (1832—1887), that are not included in the GHCN archive, were also obtained (Phil Jones personal communication). You may recall CRU’s refusal letter to Willis Eschenbach, one of a number of […]
We’ve discussed CRU and GISS gridded data, but many of the recent news stories about the “warmest winter” come from NOAA gridded data (for example here and here) , which seems to be gaining a little market share of news attention for gridded data. I’ve started taking a look at the data. Given the intransigence […]
CSPAN webcast of House Energy Subcmte hearing on Global Climate Change starring Al Gore – starting 9:30 ET today.
UC inquired about the variance adjustment in Osborn et al (Dendrochronologia 1998), which is used in many Team publications. The number of series in many reconstructions declines as you go back in time. If you take an average of standardized series (the CVM method), the variance over an early time interval will be larger than […]
“Bring the proxies up to date” was the title of one of my earliest posts. Michael Mann had explained that doing so required the use of heavy equipment (like tree ring borers) and travel to out-of-the way sites such as Bishop, California or even Niwot Ridge, a full 45 minute drive from UCAR world headquarters […]
One of the Team’s more adventurous assumptions in creating temperature histories is that there was an abrupt and universal change in SST measurement methods away from buckets to engine inlets in 1941, coinciding with the U.S. entry into World War II. As a result, Folland et al introduced an abrupt adjustment of 0.3 deg C […]
Continued from Unthreaded #6
Here is a remarkable graphic from a new publication, Kent et al 2007, showing the distribution of SST measurements between buckets and engine inlets from 1970 on. I think that this evidence has great significance for the Folland and Parker SST adjustment, which is one of the most fundamental Team adjustments. I’ll discuss this more […]
Climate Audit 