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By: Medieval Treeline in Finland « Climate Audit

Medieval Treeline in Finland « Climate Audit — Thu, 28 Oct 2010 16:41:38 +0000

[...] 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 [...]

By: TCO

TCO — Mon, 05 Sep 2005 17:41:17 +0000

An interesting double check: what is the rate of pioneering of oak? How long would it take forests to move 150km and is this reasonable to reconcile with a 300 year warm period?

By: Jean S

Jean S — Wed, 23 Feb 2005 12:17:01 +0000

There was a very interesitng PhD thesis defended in Finland last summer, you can download it (in English)
from:
http://ethesis.helsinki.fi/julkaisut/mat/geolo/vk/helama/

I especially liked the comment on p. 31:
“Based on the present results (I,
III) it could be concluded that the warmness around the 1930s were amongst the highest during the past millennium but because of cold periods after that as well as in the beginning of the 20th century the century as a whole was not that warm. Towards the end of the past century (reconstruction in Paper I ends in the beginning of the 1990s) summertime temperatures do not seem to be rising (as with
the observational records from the study region) unlike some of the hemispheric
average series (Mann et al. 1998; Jones & Moberg 2003), implying the presence of spatial non-homogeneities in temperature climate.”

I.e. since the “consensus” says the north is warming, and your study shows the opposite,
it must be because of the regional differencies and Finland must be an exception…

By: John A.

John A. — Wed, 23 Feb 2005 11:42:22 +0000

Let me guess. The Finnish farmers had an organized oak planting in the previous century….