Dynamics of North Atlantic Deep Water masses during the Holocene

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doi: 10.1029/2011PA002155
Author(s): Hoogakker, Babette A. A.; Chapman, Mark R.; McCave, I. Nick; Hillaire-Marcel, Claude; Ellison, Christopher R. W.; Hall, Ian R.; Telford, Richard J.
Author Affiliation(s): Primary:
University of Cambridge, Department of Earth Sciences, Cambridge, United Kingdom
University of East Anglia, United Kingdom
Université du Québec à Montréal, Canada
University of Cardiff, United Kingdom
University of Bergen, Norway
Volume Title: Paleoceanography
Source: Paleoceanography, 26(4). Publisher: American Geophysical Union, Washington, DC, United States. ISSN: 0883-8305 CODEN: POCGEP
Note: In English. 61 refs.; illus., incl. 1 table
Summary: High resolution flow speed reconstructions of two core sites located on Gardar Drift in the northeast Atlantic Basin and Orphan Knoll in the northwest Atlantic Basin reveal a long-term decrease in flow speed of Northeast Atlantic Deep Water (NEADW) after 6,500 years. Benthic foraminiferal oxygen isotopes of sites currently bathed in NEADW show a 0.2 ppm depletion after 6,500 years, shortly after the start of the development of a carbon isotope gradient between NEADW and Norwegian Sea Deep Water. We consider these changes in near-bottom flow vigor and benthic foraminiferal isotope records to mark a significant reorganization of the Holocene deep ocean circulation, and attribute the changes to a weakening of NEADW flow during the mid to late Holocene that allowed the shoaling of Lower Deep Water and deeper eastward advection of Labrador Sea Water into the northeast Atlantic Basin.
Year of Publication: 2011
Research Program: ODP Ocean Drilling Program
Key Words: 07 Marine Geology and Oceanography; 24 Surficial Geology, Quaternary Geology; Absolute age; Anomalinidae; Atlantic Meridional Overturning Circulation; Atlantic Ocean; C-13/C-12; C-14; Carbon; Cassidulinacea; Cenozoic; Cibicidoides; Dates; Dynamics; Feni Ridge; Foraminifera; Gardar Drift; Holocene; Hydrodynamics; Invertebrata; Isotope ratios; Isotopes; Leg 162; Microfossils; North Atlantic; North Atlantic Deep Water; Norwegian Sea Deep Water; O-18/O-16; ODP Site 980; Ocean Drilling Program; Ocean circulation; Orphan Knoll; Oxygen; Paleo-oceanography; Protista; Quaternary; Radioactive isotopes; Rockall Bank; Rotaliina; Salinity; Sea water; Sea-surface temperature; Stable isotopes
Coordinates: N552906 N552906 W0144208 W0144208
Record ID: 2014039637
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