02568nas a2200385   4500000000100000000000100001008004100002260000800043653006300051653003100114653005500145653003500200653003500235653002000270653000800290653001600298100001500314700001600329700001800345700002300363700002100386700002100407700001600428700002000444700002000464700001600484700001200500700001700512245010800529856004300637300001100680490000700691520147000698020001402168       2009                            d  bAGU10a0473 Biogeosciences: Paleoclimatology and paleoceanography10a1635 Global Change: Oceans10a4901 Paleoceanography: Abrupt/rapid climate change10a4926 Paleoceanography: Glacial10a4960 Paleoceanography: Stadial10aHeinrich events10aLGM10aPolar Front1 aFr\ Eynaud1 aL. de Abreu1 aAntje Voelker1 aJoachim Schönfeld1 aEmilia Salgueiro1 aJean-Louis Turon1 aAur\ Penaud1 aSamuel Toucanne1 aFilipa Naughton1 aMar\ Go\~ni1 aBruno e1 aIsabel Cacho00aPosition of the Polar Front along the western Iberian margin during key cold episodes of the last 45 ka  uhttp://dx.doi.org/10.1029/2009GC002398  aQ07U050 v103 aThis 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\textdegreeN. Planktonic δ 18O (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.  a1525-2027