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Science 25 June 2004:
Vol. 304. no. 5679, pp. 1959 - 1962
DOI: 10.1126/science.1097863
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Reports

Antarctic Timing of Surface Water Changes off Chile and Patagonian Ice Sheet Response

Frank Lamy,1,2* Jérôme Kaiser,2 Ulysses Ninnemann,3 Dierk Hebbeln,2 Helge W. Arz,1 Joseph Stoner4

Marine sediments from the Chilean continental margin are used to infer millennial-scale changes in southeast Pacific surface ocean water properties and Patagonian ice sheet extent since the last glacial period. Our data show a clear "Antarctic" timing of sea surface temperature changes, which appear systematically linked to meridional displacements in sea ice, westerly winds, and the circumpolar current system. Proxy data for ice sheet changes show a similar pattern as oceanographic variations offshore, but reveal a variable glacier-response time of up to ~1000 years, which may explain some of the current discrepancies among terrestrial records in southern South America.

1 GeoForschungsZentrum-Potsdam, Telegrafenberg, 14473 Potsdam, Germany.
2 Deutsche Forschungsgemeinschaft (DFG) Research Center Ocean Margins, Klagenfurter Strasse, 28359 Bremen, Germany.
3 Department of Earth Sciences and Bjerknes Centre for Climate Research, University of Bergen, Allégaten 41, 5007 Bergen, Norway.
4 Institute of Arctic and Alpine Research, University of Colorado, Boulder CO, 80309–0450, USA.

* To whom correspondence should be addressed. E-mail: flamy{at}gfz-potsdam.de

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