date: Tue Mar  4 14:47:10 2008
from: Keith Briffa <k.briffa@uea.ac.uk>
subject: Re: JQS-08-0020 - reviewing
to: pcoxon@tcd.ie

   Dear Pete
   I will review this - hopefully within your deadline. Please forward the pdf
   best wishes
   KeithAt 10:25 04/03/2008, you wrote:

     Dear Professor Briffa
     Manuscript # JQS-08-0020 entitled "Summer temperature variations in Lapland during the
     Medieval Warm Period and the Little Ice Age relative to natural instability of
     thermohaline circulation" has been submitted to the Journal of Quaternary Science.
     As an acknowledged expert in this field I am inviting you to review this manuscript. The
     abstract appears at the end of this letter, along with the names of the authors. Please
     let me know within 5 days if you will be able to review this paper and if you can I will
     attach a PDF file of the manuscript. I would ask that you complete your review within 3
     weeks and no longer than 4 weeks from receipt.
     If you are unable to review this paper, would you take a moment to please recommend one
     or two other possible referees with expertise in this area.
     Sincerely,
     Prof. Pete Coxon
     Journal of Quaternary Science
     MANUSCRIPT DETAILS
     TITLE:
     Summer temperature variations in Lapland during the Medieval Warm Period and the Little
     Ice Age relative to natural instability of thermohaline circulation
     AUTHORS:
     Helama, Samuli; Timonen, Mauri; Holopainen, Jari; Ogurtsov, Maxim; Mielikäinen, Kari;
     Eronen, Matti; Lindholm, Markus; Meriläinen, Jouko
     ABSTRACT:
     New tree-ring based analysis for climate variability at regional scale is presented for
     high altitudes of Europe. Our absolutely dated temperature reconstruction seeks to
     characterize the summer temperatures since AD 750. The warmest and coolest reconstructed
     250-year periods occurred AD 931-1180 and AD 1601-1850, respectively. These periods owe
     significant temporal overlap with the general hemispheric climate variability due to the
     Medieval Warm Period (MWP) and the Little Ice Age (LIA). Further, we detect an approx.
     50-60-year rhythm, attributable to instability of the North Atlantic deep water, in the
     regional climate during the MWP but not during the LIA. Intensified formation of the
     North Atlantic deep water further appeared coincident to the initiation and continuation
     of MWP, the mid-LIA transient warmth occurring during the period AD 1391-1440, and to
     recent warming. Our results suggest that the internal climate variability (i.e.
     thermohaline circulation) could have played a role behind the earlier start of the MWP
     in several proxy reconstructions compared to the externally forced model simulations.
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