Position of the Polar Front along the western Iberian margin during key cold episodes of the last 45 ka.

Eynaud, Frédérique, De Abreu, Lúcia, Voelker, Antje, Schönfeld, Joachim, Salgueiro, Emilia, Turon, Jean-Louis, Penaud, Aurélie, Toucanne, Samuel, Naughton, Filipa, Sánchez Goni, Maria Fernanda, Malaizé, Bruno and Cacho, Isabel (2009) Position of the Polar Front along the western Iberian margin during key cold episodes of the last 45 ka. Open Access Geochemistry, Geophysics, Geosystems, 10 (Q07U05). DOI 10.1029/2009GC002398.

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Abstract

This paper documents the migration of the Polar Front (PF) over the Iberian margin during some of the cold climatic extremes of the last 45 ka. It is based on a compilation of robust and coherent paleohydrological proxies obtained from eleven cores distributed between 36 and 42°N. Planktonic δ18O (Globigerina bulloides), ice-rafted detritus concentrations, and the relative abundance of the polar foraminifera Neogloboquadrina pachyderma sinistral were used to track the PF position. These three data sets, compared from core to core, show a consistent evolution of the sea surface paleohydrology along the Iberian margin over the last 45 ka. We focused on five time slices representative of cold periods under distinct paleoenvironmental forcings: the 8.2 ka event and the Younger Dryas (two recent cold events occurring within high values of summer insolation), Heinrich events 1 and 4 (reflecting major episodes of massive iceberg discharges into the North Atlantic), and the Last Glacial Maximum (typifying the highest ice volume accumulated in the Northern Hemisphere). For each event, we generated schematic maps mirroring past sea surface hydrological conditions. The maps revealed that the Polar Front presence along the Iberian margin was restricted to Heinrich events. The sea surface conditions during the Last Glacial Maximum were close to those at present day, except for the northern sites which briefly experienced subarctic conditions.

Document Type: Article
Keywords: Polar Front; LGM; Heinrich events, western Iberian Margin
Research affiliation: OceanRep > The Future Ocean - Cluster of Excellence
OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-P-OZ Paleo-Oceanography
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1029/2009GC002398
ISSN: 1525-2027
Projects: Future Ocean, HERMES
Date Deposited: 06 Jul 2009 12:11
Last Modified: 14 Mar 2018 14:08
URI: http://oceanrep.geomar.de/id/eprint/3176

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