Nd isotopes of sediments, foraminifera and fish debris of the western North Atlantic

Understanding changes in ocean circulation during the last deglaciation is crucial to unraveling the dynamics of glacial-interglacial and millennial climate shifts. We used neodymium isotope measurements on postdepositional iron-manganese oxide coatings precipitated on planktonic foraminifera to rec...

Full description

Bibliographic Details
Main Authors: Roberts, Natalie L, Piotrowski, Alexander M, McManus, Jerry F, Keigwin, Lloyd D
Format: Dataset
Language:English
Published: PANGAEA 2010
Subjects:
172-1061
172-1063
Blake-Bahama Outer Ridge
North Atlantic Ocean
COMPCORE
Composite Core
EN120
EN120-1GGC
Endeavor
GC
GGC5
GGC6
Gravity corer
Joides Resolution
Leg172
North Atlantic
OCE326-GGC5
OCE326-GGC6
Ocean Drilling Program
ODP
Planktonic foraminifera
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.771834
https://doi.org/10.1594/PANGAEA.771834
Description
Summary:Understanding changes in ocean circulation during the last deglaciation is crucial to unraveling the dynamics of glacial-interglacial and millennial climate shifts. We used neodymium isotope measurements on postdepositional iron-manganese oxide coatings precipitated on planktonic foraminifera to reconstruct changes in the bottom water source of the deep western North Atlantic at the Bermuda Rise. Comparison of our deep water source record with overturning strength proxies shows that both the deep water mass source and the overturning rate shifted rapidly and synchronously during the last deglacial transition. In contrast, any freshwater perturbation caused by Heinrich event 1 could have only affected shallow overturning. These findings show how changes in upper-ocean overturning associated with millennial-scale events differ from those associated with whole-ocean deglacial climate events.

Similar Items