Late Quaternary variability of Mediterranean Outflow Water from radiogenic Nd and Pb isotopes.

Stumpf, Roland, Frank, Martin , Schönfeld, Joachim and Haley, Brian A. (2010) Late Quaternary variability of Mediterranean Outflow Water from radiogenic Nd and Pb isotopes. Quaternary Science Reviews, 29 (19/20). pp. 2462-2472. DOI 10.1016/j.quascirev.2010.06.021.

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Abstract

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 MOWbut 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.

Document Type: Article
Additional Information: Leg MSM1/3 nicht vorhanden
Keywords: Paleoceanography; Mediterranean Outflow Water; RV Meteor, M39/1, RV Poseidon, POS287, RV Maria S. Merian, MSM1/3
Research affiliation: OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-P-OZ Paleo-Oceanography
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1016/j.quascirev.2010.06.021
ISSN: 0277-3791
Projects: Future Ocean
Expeditions/Models/Experiments:
Date Deposited: 30 Aug 2010 07:55
Last Modified: 23 Sep 2019 18:17
URI: http://oceanrep.geomar.de/id/eprint/8814

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