Saturday, May 19, 2012


date: Thu, 21 Dec 2000 17:17:52 +0200 (EET)
from: Atte Korhola <>
subject: Re: PAGES synthesis
to: Keith Briffa <>

Hi Keith,

First: I wish you the most pleasant Christmas time and a happy new year.

There is very little published, quantitative stuff on the subject, yet much
under work.

Anderson et al. have a annual record of diatom diversity cahnges from a
Swedish boreal lake with comparisons to your dendro records. ref:

Anderson NJ, Odgaard B, Segerstr�m U, Renberg I (1996) Climate-lake
interactions recorded in varved sediments from a Swedish boreal forest lake.
Global Change Biology, 2, 399-405.

We have recently published one of the first strictly quantitative Holocene
temperature reconstruction from a subarctic lake in Finnish Lapland that
nicely shows LIA, Medieval Climatic anomaly and perhaps slight recent
warming, yet the temporal resolution is only some 50 to 70 years. ref:

Korhola, A., Weckstr�m, J., Holmstr�m, L. & Er�st�, P. (2000). A
quantitative Holocene climatic record from diatoms in northern Fennoscandia.
Quaternary Research 54: 284-294.

Find attached the key figure of the paper showing the reconstructed July T
for the entire Holocene (temp.bmp).

We also just submitted a paper with 5 to 10 years resolution, a record of
diatoms, in which we connect the observed assemblage changes (as shown by
PCA) with the local reconstruction of climate (using historical records,
tree-rings series, lake and rive ice cover data etc...) as well as with the
"Arctic warming" as shown by Overpeck et al. (1997) (Science paper). Our
paper has been submitted to Glob. Change Biology quite recently and we do
not know yet anything about its destiny. ref:

Sorvari, S. Korhola, A. & Thompson, R. (2000). Marked aquatic ecosystem
response to recent Arctic warming in Finnish Lapland. Global Change Biology

I include an electronic version of the paper to this mail (text + 5 cdr.
figures), yet keep this still confidental. If you are interested about
inclusion of its findings in your chapter, please contact us again and we
could agree as how to proceed (its part of Sanna's doctoral thesis, so we
must think how to proceed in the case you would be interested.

I shall think some other publication, yet these are the one I have at the
moment on my mind.

Keep on going and see you soon in London in January.

Very best,

At 15:39 15.12.2000 +0000, you wrote:
>With Ray Bradley I am writing a Synthesis chapter for the PAGES book. Our
>subject is the climate of the last 1000 years and I am putting together a
>figure and some text on the circum North Atlantic region . Are there any
>high resolution - decades , records of temperature (or moisture) that come
>out of the lake records. If there is one or more "essential" curves that I
>should include for the last 1000 years only remember, than can you send me
>a Figure and the data with calendar years to re-plot in the summary Figure.
>Also , what is the summary of the evidence from lakes in northern Europe
>that I should mention. I will probably show a curve of Keith Barber's
>wetness index based on bog data in Ireland/Scotland. This shows a wet/cool
>17th century and a warm 10th/11th. As far as resolution goes it is the best
>I know - any help appreciated. I am unfortunately short of time so a
>paragraph or two to summarize the northern lake temperature story
>(diatoms/chironomids) would be great. Are there any "must Have " 1000-year
>series from else wher you think that I should include?
>Dr. Keith Briffa, Climatic Research Unit, University of East Anglia,
>Norwich, NR4 7TJ, United Kingdom
>Phone: +44-1603-592090 Fax: +44-1603-507784

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Atte Korhola, Ph.D. Docent
Senior Research Fellow of the Academy of Finland

Department of Ecology and Systematics
Division of Hydrobiology
P.O. Box 17 (Arkadiankatu 7)
FIN-00014 University of Helsinki, Finland
Phone: +358-9-19128612; +358-40-5360357 (mobile phone)
Fax: +358-9-19128701; +358-40-6360357 (mobile fax)


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