Millennial-scale changes in deep water properties at the middepth western Iberian margin linked to Mediterranean Outflow Water activity
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Antje H.L. Voelker [1] ; Susana Lebreiro [2]
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[1] National Laboratory for Energy and Geology
National Laboratory for Energy and Geology
Socorro, Portugal
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[2] IGME. Departament of Geosciences Research and Prediction
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- Localización: Geotemas (Madrid), ISSN 1576-5172, Nº. 11, 2010 (Ejemplar dedicado a: Deep-Water Circulation: Processes & Products. International Congress. Baitona, Pontevedra, Spain. 16 & 17 June 2010), págs. 185-186
- Idioma: inglés
- Enlaces
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Resumen
Proxy records from core MD03-2699, retrieved from the western Iberian margin at 39°N and a water depth of 1895 m, reveal changes in the depth of the interface between Mediterranean Outflow Water (MOW) and Northeast Atlantic Deep Water (NEADW) during the glacial/ interglacial cycles between 580 and 300 ka, i.e.
Marine Isotope Stages (MIS) 15 to 9. MOW, identified by the bottom current intensity and bottom water temperatures (BWT), settled deeper in the water column than today and influenced site MD03-2699 especially during the icerafting events of the glacial inceptions and deglacia-tions and during the glacial maxima. MOW’s response to the climate forcing during these older glacial cycles was therefore similar to the last glacial cycle confirming that a seesaw pattern in deep convection strength between the western Mediterranean Sea and the North Atlantic Ocean existed also during those older climate periods.
