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Millennial-scale climate variability in the subpolar North Atlantic Ocean during the late Pliocene

Millennial-scale climate variability in the subpolar North Atlantic Ocean during the late Pliocene
Millennial-scale climate variability in the subpolar North Atlantic Ocean during the late Pliocene
Large?amplitude millennial?scale climate oscillations have been identified in late Pleistocene climate archives from around the world. These oscillations appear to be of larger amplitude during times of enlarged ice sheets. This observation suggests the existence of a relationship between large?amplitude millennial variations in climate and extreme glacial conditions and therefore that the emergence of millennial?scale climate variability may be linked to the Pliocene intensification of northern hemisphere glaciation (iNHG). Here we test this hypothesis using new late Pliocene high?resolution (?400 year) records of ice?rafted debris deposition and stable isotopes in planktic foraminiferal calcite (Globigerinoides ruber) generated from Integrated Ocean Drilling Program Site U1313 in the subpolar North Atlantic (a reoccupation of the classic Deep Sea Drilling Project Site 607). Our records span marine oxygen isotope stages (MIS) 103–95 (?2600 to 2400 ka), the first interval during iNHG (?3.5 to 2.5 Ma) in which large?amplitude glacial?interglacial cycles and inferred sea level changes occur. Our records reveal small?amplitude variability at periodicities of ?1.8 to 6.2 kyr that prevails regardless of (inter)glacial state with no significant amplification during the glacials MIS 100, 98, and 96. These findings imply that the threshold for the amplification of such variability to the proportions seen in the marine archive of the last glacial was not crossed during the late Pliocene and, in view of all available data, likely not until the Mid?Pleistocene Transition.
0883-8305
PA4218
Bolton, Clara T.
d3f550f0-1fe9-4d18-8a9c-a61034ab0280
Wilson, P.A.
f940a9f0-fa5a-4a64-9061-f0794bfbf7c6
Bailey, Ian
e659068f-e591-4185-afd1-5e19a5794bda
Friedrich, Oliver
680f066c-a4b1-4647-beb3-281addc1ee17
Beer, Christopher J.
099ccf7a-6bad-479b-a298-5a7fe7d64229
Becker, J.
f2e3a494-e85b-4f6c-9410-82b82644dd20
Baranwal, S.
bdb6fa6a-5c16-4fdc-9bf1-d26c0978c743
Schiebel, R.
e3ee9c3f-ae96-4523-8ec2-2ed7acdfb83a
Bolton, Clara T.
d3f550f0-1fe9-4d18-8a9c-a61034ab0280
Wilson, P.A.
f940a9f0-fa5a-4a64-9061-f0794bfbf7c6
Bailey, Ian
e659068f-e591-4185-afd1-5e19a5794bda
Friedrich, Oliver
680f066c-a4b1-4647-beb3-281addc1ee17
Beer, Christopher J.
099ccf7a-6bad-479b-a298-5a7fe7d64229
Becker, J.
f2e3a494-e85b-4f6c-9410-82b82644dd20
Baranwal, S.
bdb6fa6a-5c16-4fdc-9bf1-d26c0978c743
Schiebel, R.
e3ee9c3f-ae96-4523-8ec2-2ed7acdfb83a

Bolton, Clara T., Wilson, P.A., Bailey, Ian, Friedrich, Oliver, Beer, Christopher J., Becker, J., Baranwal, S. and Schiebel, R. (2010) Millennial-scale climate variability in the subpolar North Atlantic Ocean during the late Pliocene. Paleoceanography, 25, PA4218. (doi:10.1029/2010PA001951).

Record type: Article

Abstract

Large?amplitude millennial?scale climate oscillations have been identified in late Pleistocene climate archives from around the world. These oscillations appear to be of larger amplitude during times of enlarged ice sheets. This observation suggests the existence of a relationship between large?amplitude millennial variations in climate and extreme glacial conditions and therefore that the emergence of millennial?scale climate variability may be linked to the Pliocene intensification of northern hemisphere glaciation (iNHG). Here we test this hypothesis using new late Pliocene high?resolution (?400 year) records of ice?rafted debris deposition and stable isotopes in planktic foraminiferal calcite (Globigerinoides ruber) generated from Integrated Ocean Drilling Program Site U1313 in the subpolar North Atlantic (a reoccupation of the classic Deep Sea Drilling Project Site 607). Our records span marine oxygen isotope stages (MIS) 103–95 (?2600 to 2400 ka), the first interval during iNHG (?3.5 to 2.5 Ma) in which large?amplitude glacial?interglacial cycles and inferred sea level changes occur. Our records reveal small?amplitude variability at periodicities of ?1.8 to 6.2 kyr that prevails regardless of (inter)glacial state with no significant amplification during the glacials MIS 100, 98, and 96. These findings imply that the threshold for the amplification of such variability to the proportions seen in the marine archive of the last glacial was not crossed during the late Pliocene and, in view of all available data, likely not until the Mid?Pleistocene Transition.

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Published date: 2010

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Local EPrints ID: 166373
URI: https://eprints.soton.ac.uk/id/eprint/166373
ISSN: 0883-8305
PURE UUID: 2a4d07fe-1013-44b1-a88b-07fa168c51d2

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Date deposited: 28 Oct 2010 09:19
Last modified: 16 Jul 2019 23:50

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Contributors

Author: Clara T. Bolton
Author: P.A. Wilson
Author: Ian Bailey
Author: Oliver Friedrich
Author: Christopher J. Beer
Author: J. Becker
Author: S. Baranwal
Author: R. Schiebel

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