Isotope measurements from ODP Hole 104-642B

The Pliocene (5.3-2.6 Ma) is often described as a relatively stable climatic period, with warm temperatures characterizing high latitudes. New suborbital resolved stable isotope records from ODP Hole 642B in the Eastern Nordic Seas document that the Pliocene was not a stable period characterized by...

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Bibliographic Details
Main Authors: Risebrobakken, Bjørg, Andersson, Carin, De Schepper, Stijn, McClymont, Erin L
Format: Dataset
Language:English
Published: PANGAEA 2016
Subjects:
104-642B
AGE
Cassidulina teretis
δ13C
δ18O
Corrected
DEPTH
sediment/rock
top/min
DRILL
Drilling/drill rig
DSDP/ODP/IODP sample designation
Globigerina bulloides
Joides Resolution
Leg104
Mass spectrometer Finnigan MAT 252 and Finnigan MAT 253
Norwegian Sea
Sample code/label
Arctic
Foraminifera*
Nordic Seas
Sea ice
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.863867
https://doi.org/10.1594/PANGAEA.863867
Description
Summary:The Pliocene (5.3-2.6 Ma) is often described as a relatively stable climatic period, with warm temperatures characterizing high latitudes. New suborbital resolved stable isotope records from ODP Hole 642B in the Eastern Nordic Seas document that the Pliocene was not a stable period characterized by one climate. Rather, seven distinct climate phases, each lasting between 150,000 and 400,000 years, are identified and characterized in the time interval 5.1-3.1 Ma. Four of the transitions between the defined climate phases occurred close to an eccentricity minimum and a minimum in amplitude of change for Northern Hemisphere summer insolation, while two occurred around an eccentricity maximum and a maximum in amplitude in insolation change. Hence, a low frequency response of the Nordic Seas to insolation forcing is indicated. In addition, paleogeographic and related paleoceanographic changes, expansion of the Arctic sea ice cover and onset of NHG were important factors behind the evolving Pliocene low frequency variability in the eastern Nordic Seas. It is likely that the identified climate phases and transitions are important beyond the Nordic Seas, due to their association with changes to both insolation and paleogeography. Also, a strong and variable degree of diagenetic calcite overgrowth is documented for the planktic foraminifera, especially influencing the planktic d18O results; the absolute values and amplitude of change cannot be taken at face value.

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