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Science 25 April 2003:
Vol. 300. no. 5619, pp. 589 - 590
DOI: 10.1126/science.1083122
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Perspectives

PALEOCLIMATE:
Toward Integrated Reconstruction of Past Climates

Kevin E. Trenberth and Bette L. Otto-Bliesner

Reconstructions of past climates rely to a large extent on the difficult interpretation of climate proxies such as tree rings, ice cores, and sediments. In their Perspective, Trenberth and Otto-Bliesner argue that important issues such as the seasonality of past climate and changes in large-scale climate patterns such as the El Niño-Southern Oscillation (ENSO) can only be resolved if climate modelers and paleoclimate experts work closely together. They warn that conclusions about changes in ENSO from records that do not resolve interannual variability are especially fraught with difficulty.

The authors are at the National Center for Atmospheric Research (NCAR), Boulder, CO 80307, USA. E-mail: trenbert{at}cgd.ucar.edu

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Science. ISSN 0036-8075 (print), 1095-9203 (online)