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

Map of Core location and modern Sea Surface Temperature Antarctic Timing of Surface Water Changes off Chile and Patagonian Ice Sheet Response
Science, Vol. 304, No. 5679, pp.1959-1962, 25 June 2004.

Frank Lamy1,2, Jérôme Kaiser2, Ulysses Ninnemann3,
Dierk Hebbeln2, Helge W. Arz1, Joseph Stoner4


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

Download data from the WDC Paleo archive:
Southeast Pacific Alkenone Sea Surface Temperature Reconstruction


To read or view the full study, please visit the Science website.
It was published in Science, Vol. 304, No. 5679, pp.1959-1962, 25 June 2004.

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National Oceanic and Atmospheric Administration
14 January 2005