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Science 15 August 2003:
Vol. 301. no. 5635, pp. 948 - 952
DOI: 10.1126/science.1084451
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Reports

340,000-Year Centennial-Scale Marine Record of Southern Hemisphere Climatic Oscillation

Katharina Pahnke,1* Rainer Zahn,1,2* Henry Elderfield,3 Michael Schulz4

In order to investigate rapid climatic changes at mid-southern latitudes, we have developed centennial-scale paleoceanographic records from the southwest Pacific that enable detailed comparison with Antarctic ice core records. These records suggest close coupling of mid-southern latitudes with Antarctic climate during deglacial and interglacial periods. Glacial sections display higher variability than is seen in Antarctic ice cores, which implies climatic decoupling between mid- and high southern latitudes due to enhanced circum-Antarctic circulation. Structural and temporal similarity with the Greenland ice core record is evident in glacial sections and suggests a degree of interhemispheric synchroneity not predicted from bipolar ice core correlations.

1 School of Earth, Ocean and Planetary Sciences, Cardiff University, Park Place, Cardiff CF10 3YE, UK.
2 Institució Catalana de Recerca i Estudis Avançats (ICREA) and Facultat de Geologia, Grup de Recerca Consolidat (GRC) en Geociències Marines, Department d' Estratigafia, Paleontologia i Geosciències Marines, Universitat de Barcelona, Campus de Pedralbes, 08028 Barcelona, Spain.
3 Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EQ, UK.
4 Department of Geosciences and DFG Research Center "Ocean Margins," University of Bremen, 28334 Bremen, Germany.

* To whom correspondence should be addressed. E-mail: pahnkek{at}cf.ac.uk (K.P); rainer{at}geo.ub.es (R.Z.)

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