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Science 8 September 2000:
Vol. 289. no. 5485, pp. 1698 - 1699
DOI: 10.1126/science.289.5485.1698
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Perspectives

PALEOCLIMATE:
Taking the Temperature of Past Ocean Surfaces

Dirk Nürnberg

Accurate reconstructions of past climatic conditions on Earth are important for modeling future climate change. Researchers use climate "proxies" from deep-sea sediments, corals, or ice cores to reconstruct these past climatic conditions, but as Nürnberg explains in this Perspective, different techniques often give different answers. A relatively new technique, Mg/Ca paleothermometry, is a particularly promising tool, especially in conjunction with oxygen isotope measurements on the same planktonic foraminiferal specimens. The power of this method is exemplified by the study by Lea et al.

The author is at GEOMAR, Kiel, Germany. E-mail: dnuernberg{at}geomar.de

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