Dynamics of North Atlantic Deep Water masses during the Holocene

Babette A A Hoogakker; Mark R. Chapman; I. Nick McCave; Claude Hillaire-Marcel; Christopher R. W. Ellison; Ian R. Hall; Richard J. Telford

doi:10.1029/2011PA002155

Dynamics of North Atlantic Deep Water masses during the Holocene

Babette A A Hoogakker^*, Mark R. Chapman, I. Nick McCave, Claude Hillaire-Marcel, Christopher R. W. Ellison, Ian R. Hall, Richard J. Telford

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

82 Citations (Scopus)

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% 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.

Original language	English
Article number	PA4214
Journal	Paleoceanography
Volume	26
Issue number	4
DOIs	https://doi.org/10.1029/2011PA002155
Publication status	Published - Dec 2011

ASJC Scopus subject areas

Oceanography
Palaeontology

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10.1029/2011PA002155

Cite this

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title = "Dynamics of North Atlantic Deep Water masses during the Holocene",

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% 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.",

author = "Hoogakker, {Babette A A} and Chapman, {Mark R.} and McCave, {I. Nick} and Claude Hillaire-Marcel and Ellison, {Christopher R. W.} and Hall, {Ian R.} and Telford, {Richard J.}",

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AU - Hoogakker, Babette A A

AU - Chapman, Mark R.

AU - McCave, I. Nick

AU - Hillaire-Marcel, Claude

AU - Ellison, Christopher R. W.

AU - Hall, Ian R.

AU - Telford, Richard J.

PY - 2011/12

Y1 - 2011/12

N2 - 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% 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.

AB - 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% 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.

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JO - Paleoceanography

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M1 - PA4214

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Dynamics of North Atlantic Deep Water masses during the Holocene

Abstract

ASJC Scopus subject areas

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