From: Keith Briffa <k.briffa@uea.ac.uk>
To: t.m.melvin@uea.ac.uk
Subject: Fwd: Yamal treeline figures
Date: Mon Aug 23 16:48:58 2004

     Date: Mon, 9 Oct 2000 18:08:04 +0500
     From: Rashit Hantemirov <rashit@ipae.uran.ru>
     X-Mailer: The Bat! (v1.00 Build 1311) Registered to Andy Malyshev
     Reply-To: Rashit Hantemirov <rashit@ipae.uran.ru>
     Organization: IPAE
     Priority: Normal
     X-Confirm-Reading-To: Rashit Hantemirov <rashit@ipae.uran.ru>
     To: Keith Briffa <k.briffa@uea.ac.uk>
     Subject: Yamal treeline figures
     Dear Keith,
     Stepan Shiyatov tell me that you need some figures concerning
     Yamal chronology and tree line dynamics to show somewhere in
     France.
     Attached are archived files contained some figures.
     File MAP - the map of region of research. Red dots - subfossil
     wood sites, green marks - recent northern border of larch along
     river valleys.
     File FIGURES - in Excel format, contains several figures.
      Sheet "Values-10" - data on northernmost position of trees and
        number of trees dated for corresponding year (decadal step)
      Sheet "Treeline" - dynamics of treeline in Yamal during last 7000
        years reconstructed using about 1000 subfossil wood remains.
        Recent treeline position is about 67°34.
        One year ago we supposed (C-14 data, Hantemirov, Shiyatov
        1999) that significant drop of treeline (the transition from
        "middle" to "late" Holocene) was about 1700-1600 AD. According
        new data it was earlier (about 2550 BC). May be it is because
        of lack of data from region northward of 68°N (only 25
        datings)?
      Sheet "Treeline and Nu" - treeline dynamics and number of dated
        trees. May be number of trees reflects the long scale climate
        fluctuations as well.
      Sheet "2600-all" - for last 4600 years: treeline dynamics,
        number of trees, 11 most cold summers for last 7000 years
        (according our version of reconstruction), most expressed
        frosts in July (reconstructed using junipers from Polar Urals,
        see file PATHOL, frost in 1626 BC - based on subfossil larch -
        you can put away it), summer temperatures reconstruction
        smoothed with 20- and 100-year filters (our version of
        reconstruction).
      Sheet "Values-2" - values for preceding figures, in 2-years
        step.
      Sheet "Yam-Ur-fig" - comparing of treeline data for Yamal and
        Polar Urals upper treeline dynamics (data by S.G.Shiyatov)
      Sheet "Yamal-Ural" - values for preceding figure, in 2-years
        step.
      Sheet "Treeline-std" - treeline dynamics and 50-year standard
        deviations of summer temperatures (our version of
        reconstruction). This figure shows surprising high negative
        correlation. However may be both of them just reflect long
        scale climate fluctuations?
      Sheet "Std" - 50-year standard deviations of summer
        temperatures (our version of reconstruction) .
     File PATHOL - in Excel format, contains data and figure on
     pathological structures in tree rings of Siberian juniper
     (Juniperus sibirica Burgsd.). According our data (Hantemirov et
     al., 2000) the presence of frost rings provides evidence for
     frosts that occurred in late June or first days of July (frost
     rings in earlywood) and in the first half of July (frost rings in
     late wood). Long term and pronounced temperature drop in the
     middle of very warm period in the second half of July is the
     factor responsible for wood density fluctuations (false rings).
     Please let me know when you receive this. Some time large
     messages get lost.
     P.S. We (Eugene Vaganov, Stepan Shiyatov, Leonid Agafonov and I)
     will be in Birmensdorf from 23 till 29 October. Are you going to
     Switzerland after your meeting? We would be happy to see you
     there.
     Best regards,
     Rashit M. Hantemirov
     Lab. of Dendrochronology
     Institute of Plant and Animal Ecology
     8 Marta St., 202
     Ekaterinburg, 620144, Russia
     e-mail: rashit@ipae.uran.ru
     Fax: +7 (3432) 29 41 61; phone: +7 (3432) 29 40 92

   --
   Professor Keith Briffa,
   Climatic Research Unit
   University of East Anglia
   Norwich, NR4 7TJ, U.K.

   Phone: +44-1603-593909
   Fax: +44-1603-507784
   [1]http://www.cru.uea.ac.uk/cru/people/briffa/

References

   1. http://www.cru.uea.ac.uk/cru/people/briffa/

