Nd, Pb and Sr isotopes in sediment cores from the Gulf of Cadiz and the Portuguese margin, supplement to: Stumpf, Roland; Frank, Martin; Schönfeld, Joachim; Haley, Brian A (2010): Late Quaternary variability of Mediterranean Outflow Water from radiogenic Nd and Pb isotopes. Quaternary Science Reviews, 29(19-20), 2462-2472

Mediterranean Outflow Water (MOW) is characterised by higher temperatures and salinities than other ambient water masses. MOW spreads at water depths between 500 and 1500 m in the eastern North Atlantic and has been a source of salinity for the Atlantic Meridional Overturning Circulation in the Nort...

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Bibliographic Details
Main Authors: Stumpf, Roland, Frank, Martin, Schönfeld, Joachim, Haley, Brian A
Format: Article in Journal/Newspaper
Language:English
Published: PANGAEA - Data Publisher for Earth & Environmental Science 2010
Subjects:
Gravity corer Kiel type
MultiCorer
Gravity corer
Box corer
M39/1
MSM01/3
POS287
Meteor 1986
Maria S. Merian
Poseidon
Roland
North Atlantic
Online Access:https://dx.doi.org/10.1594/pangaea.774216
https://doi.pangaea.de/10.1594/PANGAEA.774216
Description
Summary:Mediterranean Outflow Water (MOW) is characterised by higher temperatures and salinities than other ambient water masses. MOW spreads at water depths between 500 and 1500 m in the eastern North Atlantic and has been a source of salinity for the Atlantic Meridional Overturning Circulation in the North Atlantic. We used high-resolution Nd and Pb isotope records of past ambient seawater obtained from authigenic ferromanganese coatings of sediments in three gravity cores at 577, 1745 and 1974 m water depth in the Gulf of Cadiz and along the Portuguese margin complemented by a selection of surface sediments to reconstruct the extent and pathways of MOWover the past 23 000 years. The surface and downcore Nd isotope data from all water depths exhibit only a very small variability close to the present day composition of MOW but do not reflect the present day Nd isotopic stratification of the water column as determined from a nearby open ocean hydrographic station. In contrast, the Pb isotope records show significant and systematic variations, which provide evidence for a significantly different pattern of the MOW pathways between 20 000 and 12 000 years ago compared with the subsequent period of time.

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