Barker et al. [Science 2001] studied two glacier-fed tarns (micro-lakes) high on Mount Kenya -, Small Hall Tarn (SHT) at 4289 m and Simba Tarn (ST) at 4595 m.
The last thing that I should be doing is working on new proxies without finishing off work in hand, but this new data is interesting and, with it in hand, Thompson et al [2002] is even more frustrating. There are some weird splices that you don’t notice at a first read, but start to stick […]
A climateaudit first:- here is the first sample-by-sample àŽⳏ18 for an entire Thompson drill core – in this case KNIF2 and KNIF3 from Kilimanjaro. I had hoped that the data would be properly archived, but it was sent to me by Science and is webbed up here pending a more official archive, which will presumably […]
After a couple of bitchy posts about Ritson and Huybers, I’d like to do something a little more cheerful. Here’s some information that I’ve collected about Timber Gap Upper (ca529) and Timber Gap Lower (ca532), two Graybill foxtail pine sites that were important components of the MBH98 PC1 and have been used elsewhere. I’ve identified […]
David Stockwell has suggested a discussion of nonlinear responses of tree growth to temperature. I’ve summarized here some observations which I’ve seen about bristlecones, limber pine, cedars and spruce – all showing an upside-down U-shaped response to temperature. The implications of this type of relationship for the multiproxy project of attempting to reconstruct past temperatures […]
Naurzbaev et al [2004] is a terrific article by Naurzbaev, Hughes (yes, that Hughes) and Vaganov about deducing climate information from tree-ring growth curves in Siberia. (I find Naurzbaev’s work consistently interesting.) They studied 34 larch sites in a meridional transect from 55 to 72 N (at a longitude of about 90-100E) and 23 larch […]
I have recently located a copy of Graybill and Funkhouser [1993], Dendroclimatic Reconstructions during the past millennium in the southern Sierra Nevada and Owens Valley, California, which has been very hard to find. This appears to be Graybill’s last publication before he died. A detailed excerpt follows. Some key quotes: Unfortunately the chronologies from the […]
I have obviously been very critical of the 11th century portion of the Polar Urals dataset used in Briffa et al. [1995], without which Jones et al [1998] does not have a cold 11th century (and which is a staple of other studies). It turns out that Schweingruber collected new subfossil samples for this site […]
Here is Lamarche’s diagram of altitudes at the key bristlecone sites of Sheep Mountain and Campito Mountain (as noted below, when wood erosion is allosed for, the post-MWP decline is placed after 1500.)
Valmore Lamarche was perhaps the first person to suggest that temperature information could be extracted from bristlecone pine information and his early publications are often referenced. Lamarche et al. [1984] (with Fritts, Graybill and Rose) first postulated CO2 fertilization. As you know, I’m increasingly interested in changes in treeline elevation as a "low-frequency proxy". It […]
Climate Audit 