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TZUNTIL:20061029T010000Z
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DTSTART:20041031T030000
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UID:www.bayceer.uni-bayreuth.de-bayceer-t53288id
DTSTAMP:20260919T072927Z
DESCRIPTION:The important data for the understanding of climate fluctuation
 s and the related environment changes since the Late Weichselian were obta
 ined by the study of lacustrine cores from the Russian Arctic. It has been
  proved that such continuous records provide the high-resolution environme
 ntal history up to the 30\,000 years. Although\, they are mostly not yearl
 y\, but decade or centennial resolution records\, they are only available 
 data from vast Eurasian regions\, providing a base to reconstruct climate 
 variability on time scales from decades to hundreds or thousands of years.
 \nSeveral lake cores from the Lake Lyadhej-To (68°15\'N\, 65°45\'E) situat
 ed at the NW rim of the Polar Ural to the Lake Nikolay (73°20²N\, 124°12²E
 ) from Arga Island in the Lena River Delta. Three statistical approaches w
 ere used to reconstruct climate from the pollen records: the Best Modern A
 nalogue method (Guiot\, 1990)\, the Plant Functional Types method (Peyron 
 et al.\, 1998) is based on the biomization concept of Prentice et al. (199
 6) and Information-Statistical method (Klimanov\, 1976\, 1984). The method
 s show comparable results in reconstruction of thermal and hydrological ch
 anges during the last 10\,000 years. The time of maximum warmth took place
  during the Early-Middle Holocene. The differences are relatively small co
 mpared to the statistical errors of the reconstructions. \nSurface pollen 
 spectra tests demonstrate that the Best Modern Analogue method reconstruct
 s modern climate variables at Arctic with a reasonably high accuracy (Tara
 sov et al. 2002). Correlation coefficients between reconstructed and calcu
 lated climate variables have suggested that TVII and annual sum of the day
  temperatures above 5ºC (the so-called sum of growing-degree-days with tem
 peratures above 5ºC) can be reconstructed with reasonably high confidence 
 (R=0.80 and 0.82 respectively). Among the other tested variables P and run
 off (difference between P and evaporation (E)) were reconstructed from the
  modern spectra with relatively high accuracy (R=0.68 and 0.61 respectivel
 y).
DTSTART;TZID=Europe/Berlin:20050127T161500
DTEND;TZID=Europe/Berlin:20050127T235959
LOCATION:H6
SUMMARY:Dr. Andrej Andreev\, Alfred Wegener Institute for Polar and Marine 
 Research\, Potsdam:  Arctic lake sediments as paleoclimatic archives
TRANSP:TRANSPARENT
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