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Low-Frequency Signals in Long Tree-Ring Chronologies for Reconstructing Past Temperature Variability
Jan Esper,1Edward R. Cook,2*Fritz H. Schweingruber1
Preserving multicentennial climate variability in long tree-ring
records is critically important for reconstructing the fullrange of
temperature variability over the past 1000 years. Thisallows the
putative "Medieval Warm Period" (MWP) to be describedand to be
compared with 20th-century warming in modeling and attributionstudies.
We demonstrate that carefully selected tree-ring chronologiesfrom 14 sites in the Northern Hemisphere (NH) extratropics canpreserve such
coherent large-scale, multicentennial temperaturetrends if proper
methods of analysis are used. In addition, weshow that the average of
these chronologies supports the large-scaleoccurrence of the MWP over
the NH extratropics.
1 Swiss Federal Research Institute WSL,
Zuercherstrasse 111, 8903 Birmensdorf, Switzerland.
2 Lamont-Doherty Earth Observatory, Palisades, NY
10964, USA.
*
To whom correspondence should be addressed. E-mail:
drdendro{at}ldeo.columbia.edu
The editors suggest the following Related Resources on Science sites:
In Science Magazine
LETTERS
Michael E. Mann, Malcolm K. Hughes;, Edward R. Cook, and Jan Esper (3 May 2002) Science296 (5569), 848.
[DOI: 10.1126/science.296.5569.848] |Full Text »
PERSPECTIVES
Keith R. Briffa and Timothy J. Osborn (22 March 2002) Science295 (5563), 2227.
[DOI: 10.1126/science.1069486] |Summary »|Full Text »|PDF »
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