Foraminifer and IRD counts from ODP Site 162-983 ...

Throughout the last glacial cycle millennial timescale variations in atmospheric CO2 occurred in parallel with perturbations in deep ocean circulation, which were themselves reflected by observable changes in surface conditions across the North Atlantic region. Here we use continuous proxy records t...

Full description

Bibliographic Details
Main Authors: Barker, Stephen, Knorr, Gregor, Conn, Stephen, Lordsmith, Sian, Newman, Dhobasheni, Thornalley, David J R
Format: Dataset
Language:English
Published: PANGAEA 2019
Subjects:
IRD
%NPS
ODP 983
pachyderma
Event label
Sample code/label
DEPTH, sediment/rock
Density, dry bulk
AGE
Sedimentation rate
Accumulation rate, mass
Size fraction > 0.063 mm, sand
Size fraction < 0.063 mm, mud, silt+clay
Split
Total counts
Foraminifera, planktic, whole test
Neogloboquadrina pachyderma sinistral
Ice rafted debris
Accumulation rate, ice rafted debris by number
Composite Core
Drilling/drill rig
Mass spectrometer VG Prism Series II
Calculated
Counting >150 µm fraction
Leg162
Joides Resolution
Ocean Drilling Program ODP
Neogloboquadrina pachyderma
North Atlantic
Online Access:https://dx.doi.org/10.1594/pangaea.904398
https://doi.pangaea.de/10.1594/PANGAEA.904398
Description
Summary:Throughout the last glacial cycle millennial timescale variations in atmospheric CO2 occurred in parallel with perturbations in deep ocean circulation, which were themselves reflected by observable changes in surface conditions across the North Atlantic region. Here we use continuous proxy records to argue that an equivalent relationship has held throughout the last 800kyr i.e. since before the first occurrence of Heinrich events sensu stricto. Our results highlight the importance of internal climate dynamics in amplifying external (insolation) forcing on the climate system to produce the large amplitude of glacial terminations (deglaciations) during the mid to late Pleistocene. We show that terminations are characterized by an interval of intense ice rafting followed by a subsequent and abrupt shift to anomalously warm surface conditions (with respect to the more gradually evolving background state), which we interpret to reflect an abrupt recovery of deep ocean circulation in the Atlantic. According to our ... : Supplement to: Barker, Stephen; Knorr, Gregor; Conn, Stephen; Lordsmith, Sian; Newman, Dhobasheni; Thornalley, David J R (2019): Early Interglacial Legacy of Deglacial Climate Instability. Paleoceanography and Paleoclimatology, 34(8), 1455-1475 ...

Similar Items