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"The Holocene" Online
This entry was written by Stephen McIntyre, posted on Nov 11, 2006 at 1:02 PM, filed under General. Bookmark the permalink. Follow any comments here with the RSS feed for this post.
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15 Comments
It’s been added to the Weblogs and Resources section in the sidebar.
Thanks! I found an interesting study:
Seija Kultti, Kari Mikkola, Tarmo Virtanen, Mauri Timonen, and Matti Eronen (2006): Past changes in the Scots pine forest line and climate in Finnish Lapland: a study based on megafossils, lake sediments, and GIS-based vegetation and climate data, The Holocene 16: 381-391.
Abstract:
Subfossil samples of Scots pine (Pinus sylvestris) and evidence of pine stomata and pollen accumulation rates from previously studied lakes located beyond the present pine forest line in Finnish Lapland were used to reconstruct the extent of the past forest line and the corresponding minimum shift in mean July temperatures, compared with the present. The location of the present pine forest line follows the c. + 12.2C mean July temperature isoline (1961-1990). When minimum shifts in mean July temperatures during the Holocene were studied, the estimated glacio-isostatic land uplift and its regional differences were taken into account. Results indicate that pine reached its maximum distribution between 8300 and 4000 cal. yr BP. The inferred minimum shift in mean July temperature was at that time c. +2.5. Until 3000 cal. yr BP, the results indicate a shift of c. + 1°C. Between 2538 and 1721 cal. yr BP, evidence for a wider distribution of pine in Finnish Lapland is lacking. During the “Mediaeval Warm Period’ the reconstructed minimum shift in mean July temperature was +0.5. The record of subfossil pines beyond the present pine treeline ceases during the initiation of the “Little Ice Age’, c. 700 years ago.
Steve/John A: Please, could you extract here the figure 4 (7 temperature reconstructions from Finnish Lapland (~69N 26E) compared) from the study for people to see?
re #3: Thanks! Now everyone can see the dangerous arctic warming … notice also the treering study compared to the other ones. For Helama’s sake, as I have said here before, he now has better reconstructions. See also the new high frequency 800-year reconstruction by Weckstràƒ et al..
#4. Jean S, the Tsuolmajavri reconstruction linked here was one of the Moberg proxies. It goes up to 1980, but was left out of Juckes’ Moberg CVM and Juckes’ all-star team – althogh he used Tornetrask tree rings twice.
Steve, I think it would be interesting to take the Weckstràƒ et al (also from Tsuolmajavri) decadal smoothed curve as one of MBH (e.g. AD1400) proxies … I’m sure it has a nice correlation with the caliberation instrumental series 😉 Here the figure:
I don’t have time to extract the curve (blue), so if any kind soul here would volunteer to do it, I (and I’m sure Steve also) would appreciate it a lot!
Did not show up: http://photos1.blogger.com/blogger/536/1821/1600/0.jpg
#7. Hans Erren digitized a Tsuolmajavroi version for me last year. If you go to http://www.climateaudit.org/data/moberg.proxy.txt, the Tsuol series is one of the collated proxies.
re #8: Thanks! That’s the series from:
A. Korhola, J. WeckstràÆà, L. HolmstràÆà, and P. EràÆà⣳tàÆà A quantitative Holocene climatic record from diatoms in northern Fennoscandia. Quaternary Research, 54:284-294, 2000.
Some relevant comments from WeckstràÆà et al (2006) (my emphasis):
Of course I forgot to say that Korhola et al (2000) in #8/#9 is the f series in #3.
Re: 7, Jean S
I got a 403 error when I used the link.
re #11: Sorry, I used the link to a blog, where I saw the image posted (as I think most people here do not have access to the original publications). I guess there is a limit how many times it can be viewed etc.
Those with the access you can find the image (figure 4) from:
http://dx.doi.org/10.1016/j.yqres.2006.01.005
In Hiroshi Moriwaki et al. 2006: Sea level and coastal environments of Rarotonga, Cook Islands, the authors’ conclusions were stated as follows:
A tectonically stable island lying roughly 3,000 km NE of New Zealand shows a significantly highly sea level prior to 800 – 500 years BP. This level was ~1.5 m higher than present sea level.
On page 845 the authors discuss sea level change:
Rorotonga is a long way from Europe where the LIA and the preceeding warm period are said to be anomolies by those who claim that the global climate was essentially stable until recent times.
Sea level and coastal environments of Rarotonga, Cook Islands
I sampled a dozen papers from 2006, and added several more from “climate Science” and this unscientific study would suggest strongly that the “consensus” has broken down. All of the papers sampled show a MWP and LIA, and most show a MWP warmer than the present, and prior warm periods considerably warmer than present. Has anyone taken a similar look at the 2005 archive? I suspect the AGW panic is in the early stages of fading away. Murray
Notice that the reconstructions c (also from Tsuolbajavri) and d (Lake Toskaljavri, 69º12’N, 21º28’E) in #3 are downloadable from here:
http://www.helsinki.fi/science/palaeoclim/datadown.htm