Climate of the Past Discussions www.clim-past-discuss.net 1814-9340 1814-9359 4 2 2008 10.5194/cpd-4-375-2008 http://www.clim-past-discuss.net/4/375/2008/ http://www.clim-past-discuss.net/4/375/2008/cpd-4-375-2008.html http://www.clim-past-discuss.net/4/375/2008/cpd-4-375-2008.pdf 375 414 2008-03-28 Millennial-scale climatic variability between 340 000 and 270 000 years ago in SW Europe: evidence from a NW Iberian margin pollen sequence S. Desprat sdesprat@whoi.edu M. F. Sánchez Goñi J. Duprat E. Cortijo J. F. McManus EPHE, UMR-CNRS 5805, EPOC, Université Bordeaux 1, Avenue des Facultés, 33405 Talence, France Woods Hole Oceanographic Institution, Department of Geology and Geophysics, Woods Hole, MA 02543, USA Laboratoire des Sciences du Climat et de l'Environnement, LSCE-Vallée, Bât. 12, avenue de la Terrasse, F-91198 Gif-Sur-Yvette cedex, France We present a new high-resolution marine pollen record from NW Iberian margin sediments (core MD03-2697) covering the interval between 340 000 and 270 000 years ago a time period centred on Marine Isotope Stage (MIS) 9 and characterised by particular baseline climate states. This study enables to document the vegetation changes in north-western Iberian Peninsula and therefore the terrestrial climatic variability at orbital and in particular at millennial scales during MIS 9, directly on a marine stratigraphy. Suborbital vegetation changes in NW Iberia in response to cool/cold events are detected throughout the studied interval even during MIS 9e ice volume minimum. However, they appears more frequent and of higher amplitude during the 30 000 years following the MIS 9e interglacial period and during the MIS 9a-8 transition which correspond to intervals of an intermediate to high ice volume and mainly periods of ice growth. Each suborbital cold event detected in NW Iberia has a counterpart in the southern Iberian margin SST record. High to moderate amplitude cold episodes detected on land and in the ocean appears related to changes in deep water circulation and likely to iceberg discharges at least during MIS 9d, the mid-MIS 9c cold event and MIS 9b. This work provides therefore additional evidence of a pervasive millennial-scale climatic variability in the North Atlantic borderlands throughout past climatic cycles of the Late Pleistocene, regardless of glacial state. 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