TY - JOUR
KW - 0473 Biogeosciences: Paleoclimatology and paleoceanography
KW - 1635 Global Change: Oceans
KW - 4901 Paleoceanography: Abrupt/rapid climate change
KW - 4926 Paleoceanography: Glacial
KW - 4960 Paleoceanography: Stadial
KW - Heinrich events
KW - LGM
KW - Polar Front
AU - Fr\ Eynaud
AU - L. de Abreu
AU - Antje Voelker
AU - Joachim Schönfeld
AU - Emilia Salgueiro
AU - Jean-Louis Turon
AU - Aur\ Penaud
AU - Samuel Toucanne
AU - Filipa Naughton
AU - Mar\ Go\~ni
AU - Bruno e
AU - Isabel Cacho
AB - 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\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.
BT - Geochem. Geophys. Geosyst.
M1 - 7
N2 - 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\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.
PB - AGU
PY - 2009
SN - 1525-2027
EP - Q07U05
T2 - Geochem. Geophys. Geosyst.
TI - Position of the Polar Front along the western Iberian margin during key cold episodes of the last 45 ka
UR - http://dx.doi.org/10.1029/2009GC002398
VL - 10
ER -