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Science 22 March 2002:
Vol. 295. no. 5563, pp. 2250 - 2253
DOI: 10.1126/science.1066208
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Reports

Low-Frequency Signals in Long Tree-Ring Chronologies for Reconstructing Past Temperature Variability

Jan Esper,1 Edward R. Cook,2* Fritz H. Schweingruber1

Preserving multicentennial climate variability in long tree-ring records is critically important for reconstructing the full range of temperature variability over the past 1000 years. This allows the putative "Medieval Warm Period" (MWP) to be described and to be compared with 20th-century warming in modeling and attribution studies. We demonstrate that carefully selected tree-ring chronologies from 14 sites in the Northern Hemisphere (NH) extratropics can preserve such coherent large-scale, multicentennial temperature trends if proper methods of analysis are used. In addition, we show that the average of these chronologies supports the large-scale occurrence 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

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