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

American Association for the Advancement of Science (AAAS) - Tập 304 Số 5679 - Trang 1959-1962 - 2004
Frank Lamy1,2,3, Jérôme Kaiser1,2,3, Ulysses S. Ninnemann1,2,4,3, Dierk Hebbeln1,2,3, Helge W. Arz1,2,4,3, Joseph S. Stoner1,2,4,3
1Department of Earth Sciences and Bjerknes Centre for Climate Research, University of Bergen, Allégaten 41, 5007 Bergen, Norway.
2Deutsche Forschungsgemeinschaft (DFG) Research Center Ocean Margins, Klagenfurter Strasse, 28359 Bremen, Germany.
3Institute of Arctic and Alpine Research, University of Colorado, Boulder CO, 80309–0450, USA.
4GeoForschungsZentrum-Potsdam, Telegrafenberg, 14473 Potsdam, Germany

Tóm tắt

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.

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We thank A. Mix and R. Tiedemann the Shipboard Scientific Party captain and crew of ODP Leg 202; U. Röhl for support in x-ray fluorescence core scanning; N. Hulton for discussions on Patagonian ice sheet changes; and G. Haug for helpful comments. Supported by the DFG (Projekt HE 3412/1-2) and the Bjerknes Centre for Climate Research. This research used samples provided by the ODP. The ODP is sponsored by NSF and participating countries under management of Joint Oceanographic Institutions (JOI) Inc.

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American Association for the Advancement of Science (AAAS)

Tập 304 Số 5679

1959-1962

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