Dynamics of North Atlantic Deep Water masses during the Holocene
|Author(s)||Hoogakker Babette A. A.1, Chapman Mark R.2, McCave I. Nick1, Hillaire-Marcel Claude3, Ellison Christopher R. W.2, Hall Ian R.4, Telford Richard J.5|
|Affiliation(s)||1 : Univ Cambridge, Dept Earth Sci, Cambridge CB2 3EQ, England.
2 : Univ E Anglia, Sch Environm Sci, Norwich NR4 7TJ, Norfolk, England.
3 : Univ Quebec, Ctr GEOTOP, Montreal, PQ H3C 3P8, Canada.
4 : Cardiff Univ, Sch Earth & Ocean Sci, Cardiff CF10 3AT, S Glam, Wales.
5 : Univ Bergen, Dept Biol, N-5020 Bergen, Norway.
|Source||Paleoceanography (0883-8305) (Amer Geophysical Union), 2011-11 , Vol. 26 , N. 4 / PA4214 , P. 1-10|
|WOS© Times Cited||67|
|Abstract||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 parts per thousand 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.|