Temporal changes in North Atlantic circulation constrained by planktonic foraminiferal shell weights

Records of planktonic foraminiferal shell weights for Globigerina bulloides, covering Termination I from four proximal sites at waters depths from 1150 to 4045 m in the northeast Atlantic, demonstrate the influence of dissolution superimposed upon initial shell weight variability. Records of shell w...

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Bibliographic Details
Published in:Paleoceanography
Main Authors: Barker, Stephen, Kiefer, T., Elderfield, H.
Format: Article in Journal/Newspaper
Language:English
Published: American Geophysical Union 2004
Subjects:
Online Access:https://orca.cardiff.ac.uk/id/eprint/11148/
https://doi.org/10.1029/2004PA001004
https://orca.cardiff.ac.uk/id/eprint/11148/1/Barker%202004.pdf
Description
Summary:Records of planktonic foraminiferal shell weights for Globigerina bulloides, covering Termination I from four proximal sites at waters depths from 1150 to 4045 m in the northeast Atlantic, demonstrate the influence of dissolution superimposed upon initial shell weight variability. Records of shell weight, unaffected by dissolution, may be used as a reference for interpreting deeper records in terms of preservation history. Combining records of planktonic shell weight (and benthic δ13C) from shallow and deep sites suggests that maximum oceanic stratification and incursion of southern sourced deep waters in the North Atlantic occurred at about 18–20 ka, defining the glacial mode of Atlantic circulation. Reduced stratification and enhanced preservation in deeper waters reflect conditions during Heinrich event 1. A state similar to the modern mode of Atlantic circulation was attained by about 10 ka.