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  discussed here and adds to the growing inventory of articles both demonstrating higher medieval treelines and using this to estimate MWP temperatures locally higher than at present, some of which I’ve posted about from time to time Medieval Category. These “local” results from treelines are not limited to the north Atlantic and Greenland, but extend to the Sierra Nevadas (117 W), Sweden, Finland, Polar Urals (65 E) and a Siberian transect (90-100E). I’ll add a comment on Chinese proxies of this type. Kultti et al. also consider information from other proxies and report similar results for all proxies EXCEPT the tree ring width chronology of Helama et al . Here are some extended quotes.
Kultti et al. report that treeline is a proxy for July temperature, They state that:
During the “ÅMediaeval Warm Period’ the distribution area of pine was 7200 km2 more extensive than at present, and pines were growing at 40-/80 m higher altitudes. For this period, the mean July temperature reconstruction shows /0.55 deg C shift compared with the present….
Their survey of similar results mention:
At the same time, presence of pine has been detected c. 100 m above the current pine limit in Sweden (Kullman, 1998) and 100/140 m above in the Kola Peninsula (Hiller et al., 2001). The same pattern at the upper larch (Larix sibirica) timberline on the Eastern side of the Ural Mountains has also been found; from c. 1000 cal. yr BP to c. 600 cal. yr BP numerous megafossils have been found from above the present tree limit (Shiyatov, 1993). Assuming a lapse rate 0.6 deg C per 100 m, these finds correspond with a shift of/0.6-0.8 deg C in temperatures.The conifer limit during the “ÅMediaeval Warm Period’ appears to have been well above the present conifer limit in extensive areas in Fennoscandia and Russia. This suggests that the climate during the “ÅMediaeval Warm Period’ was even warmer than during the twentieth century in northern Fennoscandia. Most of the quantitative reconstructions from Finnish Lapland (Figure 4) show warmer than at present at c. 1000 years ago (Korhola et al., 2000, 2002; Seppa and Birks, 2001, 2002, Seppa et al., 2002). Only reconstruction made from tree-ring widths suggests colder than at present mean July temperature (Helama et al., 2002)
Their Figure 4 shows the following other reconstructions. The Korhola proxy is used in Moberg et al 2005, where it contributes to the warmish MWP in Moberg. However, this proxy in Moberg is swamped by two non-normal series – the offshore Oman coldwater diatoms and Agassiz melt, discussed elsewhere.
Original Caption. Figure 4 The mean July temperature anomalies from present in the reconstructions from Finnish Lapland. Reconstruction a shows minimum shift in mean July temperatures between 8300 cal. yr BP and present based on this study. Reconstructions from lake sediments (b, c, d, e and f) show deviations from the mean of three uppermost samples. In reconstruction g non-overlapping 100-yr mean deviations from the twentieth century are shown. Reconstructions b and c are from Tsuolbmajavri and d, e and f from Toskaljavri. Reconstructions a, b, c, d, e and f are elevation adjusted for land uplift. Numbers in parentheses in reconstruction a refer to the site number in Table 2
Kultti et al  was submitted on 2 February 2004; the revised manuscript was accepted 19 October 2005. Thus, its submission long preceded the May 2005 data for consideration in the IPCC First Draft and the acceptance long preceded the December 2005 cut-off data, in marked contrast to (say) Wahl and Ammann 2006 or Osborn and Briffa 2006, which met neither date. I wonder if Kultti et al will be incorporated in IPCC 4AR.
Kultti, Seija, Kari Mikkola, Tarmo Virtanen, Mauri Timonen and Matti Eronen, 2006.1Past 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 16,3 (2006) 381-/391.
Huldén, Lena, 2001. Terra 113, 171-8. Oak barrels and the medieval warm period in Satakunta [Finland] (Finnish) .