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Cretaceous deep-water formation in the Indian sector of the Southern Ocean

Cretaceous deep-water formation in the Indian sector of the Southern Ocean
Cretaceous deep-water formation in the Indian sector of the Southern Ocean
The role that meridional overturning circulation (MOC) patterns played in poleward heat transport during the extreme warmth of the Early to Late Cretaceous is a fundamental and unresolved question in climate dynamics. In order to address this question we must determine where deep waters formed, and how they may have circulated during periods of extreme warmth. Here we present late Albian through Maastrichtian (105 to 65 Ma) Nd isotope records from Deep Sea Drilling Project (DSDP) and Ocean Drilling Program (ODP) sites in the proto-Indian Ocean and the tropical Pacific. Comparison of these data with previously published records indicates deep-water formation in the Indian sector of the Southern Ocean began at least ~105 Ma, extending the record of high-latitude convection back into the Early Cretaceous prior to the peak warmth of the mid-Cretaceous. The growing body of data supports a mode of MOC in part characterized by high-latitude downwelling during the peak of greenhouse warmth of the Mesozoic and Cenozoic. However, this mode of MOC likely was characterized by numerous locations of deep convection that were regionally important, but not significant in terms of a globally overturning circulation due to paleogeographic and bathymetric barriers.
0883-8305
PA1211
Murphy, Daniel P.
7dc8e6dc-a302-4486-a5f3-8dd6fcdbbacb
Thomas, Deborah J.
1331ccc3-1e5d-4aad-b2db-da804a9ef786
Murphy, Daniel P.
7dc8e6dc-a302-4486-a5f3-8dd6fcdbbacb
Thomas, Deborah J.
1331ccc3-1e5d-4aad-b2db-da804a9ef786

Murphy, Daniel P. and Thomas, Deborah J. (2012) Cretaceous deep-water formation in the Indian sector of the Southern Ocean. Paleoceanography, 27 (1), PA1211. (doi:10.1029/2011PA002198).

Record type: Article

Abstract

The role that meridional overturning circulation (MOC) patterns played in poleward heat transport during the extreme warmth of the Early to Late Cretaceous is a fundamental and unresolved question in climate dynamics. In order to address this question we must determine where deep waters formed, and how they may have circulated during periods of extreme warmth. Here we present late Albian through Maastrichtian (105 to 65 Ma) Nd isotope records from Deep Sea Drilling Project (DSDP) and Ocean Drilling Program (ODP) sites in the proto-Indian Ocean and the tropical Pacific. Comparison of these data with previously published records indicates deep-water formation in the Indian sector of the Southern Ocean began at least ~105 Ma, extending the record of high-latitude convection back into the Early Cretaceous prior to the peak warmth of the mid-Cretaceous. The growing body of data supports a mode of MOC in part characterized by high-latitude downwelling during the peak of greenhouse warmth of the Mesozoic and Cenozoic. However, this mode of MOC likely was characterized by numerous locations of deep convection that were regionally important, but not significant in terms of a globally overturning circulation due to paleogeographic and bathymetric barriers.

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Published date: 2012
Organisations: Geochemistry

Identifiers

Local EPrints ID: 337018
URI: http://eprints.soton.ac.uk/id/eprint/337018
ISSN: 0883-8305
PURE UUID: a37816c2-b6e0-4605-8aea-ec63f7db4fc5

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Date deposited: 13 Apr 2012 15:34
Last modified: 14 Mar 2024 10:48

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Contributors

Author: Daniel P. Murphy
Author: Deborah J. Thomas

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