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Centennial-scale evolution of Dansgaard-Oeschger events in the northeast Atlantic Ocean between 39.5 and 56.5 ka B.P.

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Centennial-scale evolution of Dansgaard-Oeschger events in the northeast Atlantic Ocean between 39.5 and 56.5 ka B.P. / Dickson, Alexander J.; Austin, William; Hall, Ian R.; Maslin, Mark A.; Kucera, Michal.

In: Paleoceanography, Vol. 23, No. 3, PA3206, 15.07.2008.

Research output: Contribution to journalArticle

Harvard

Dickson, AJ, Austin, W, Hall, IR, Maslin, MA & Kucera, M 2008, 'Centennial-scale evolution of Dansgaard-Oeschger events in the northeast Atlantic Ocean between 39.5 and 56.5 ka B.P.' Paleoceanography, vol. 23, no. 3, PA3206. https://doi.org/10.1029/2008PA001595

APA

Dickson, A. J., Austin, W., Hall, I. R., Maslin, M. A., & Kucera, M. (2008). Centennial-scale evolution of Dansgaard-Oeschger events in the northeast Atlantic Ocean between 39.5 and 56.5 ka B.P. Paleoceanography, 23(3), [PA3206]. https://doi.org/10.1029/2008PA001595

Vancouver

Dickson AJ, Austin W, Hall IR, Maslin MA, Kucera M. Centennial-scale evolution of Dansgaard-Oeschger events in the northeast Atlantic Ocean between 39.5 and 56.5 ka B.P. Paleoceanography. 2008 Jul 15;23(3). PA3206. https://doi.org/10.1029/2008PA001595

Author

Dickson, Alexander J. ; Austin, William ; Hall, Ian R. ; Maslin, Mark A. ; Kucera, Michal. / Centennial-scale evolution of Dansgaard-Oeschger events in the northeast Atlantic Ocean between 39.5 and 56.5 ka B.P. In: Paleoceanography. 2008 ; Vol. 23, No. 3.

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@article{520015e956f64a15b1d988a32622246f,
title = "Centennial-scale evolution of Dansgaard-Oeschger events in the northeast Atlantic Ocean between 39.5 and 56.5 ka B.P.",
abstract = "[1] There is much uncertainty surrounding the mechanisms that forced the abrupt climate fluctuations found in many palaeoclimate records during Marine Isotope Stage (MIS)-3. One of the processes thought to be involved in these events is the Atlantic Meridional Overturning Circulation ( MOC), which exhibited large changes in its dominant mode throughout the last glacial period. Giant piston core MD95- 2006 from the northeast Atlantic Ocean records a suite of palaeoceanographic proxies related to the activity of both surface and deep water masses through a period of MIS- 3 when abrupt climate fluctuations were extremely pronounced. A two- stage progression of surface water warming during interstadial warm events is proposed, with initial warming related to the northward advection of a thin warm surface layer within the North Atlantic Current, which only extended into deeper surface layers as the interstadial progressed. Benthic foraminifera isotope data also show millennialscale oscillations but of a different structure to the abrupt surface water changes. These changes are argued to partly be related to the influence of low- salinity deepwater brines. The influence of deepwater brines over the site of MD95- 2006 reached a maximum at times of rapid warming of surface waters. This observation supports the suggestion that brine formation may have helped to destabilize the accumulation of warm, saline surface waters at low latitudes, helping to force the MOC into a warm mode of operation. The contribution of deepwater brines relative to other mechanisms proposed to alter the state of the MOC needs to be examined further in future studies.",
keywords = "MARINE ISOTOPE STAGE-3, ABRUPT CLIMATE-CHANGE, LAST GLACIAL PERIOD, SEA-SURFACE TEMPERATURES, GREENLAND ICE-CORE, PLANKTONIC-FORAMINIFERA, THERMOHALINE CIRCULATION, ICEBERG DISCHARGES, OXYGEN-ISOTOPE, RAPID CHANGES",
author = "Dickson, {Alexander J.} and William Austin and Hall, {Ian R.} and Maslin, {Mark A.} and Michal Kucera",
year = "2008",
month = "7",
day = "15",
doi = "10.1029/2008PA001595",
language = "English",
volume = "23",
journal = "Paleoceanography",
issn = "0883-8305",
publisher = "John Wiley & Sons, Ltd.",
number = "3",

}

RIS (suitable for import to EndNote) - Download

TY - JOUR

T1 - Centennial-scale evolution of Dansgaard-Oeschger events in the northeast Atlantic Ocean between 39.5 and 56.5 ka B.P.

AU - Dickson, Alexander J.

AU - Austin, William

AU - Hall, Ian R.

AU - Maslin, Mark A.

AU - Kucera, Michal

PY - 2008/7/15

Y1 - 2008/7/15

N2 - [1] There is much uncertainty surrounding the mechanisms that forced the abrupt climate fluctuations found in many palaeoclimate records during Marine Isotope Stage (MIS)-3. One of the processes thought to be involved in these events is the Atlantic Meridional Overturning Circulation ( MOC), which exhibited large changes in its dominant mode throughout the last glacial period. Giant piston core MD95- 2006 from the northeast Atlantic Ocean records a suite of palaeoceanographic proxies related to the activity of both surface and deep water masses through a period of MIS- 3 when abrupt climate fluctuations were extremely pronounced. A two- stage progression of surface water warming during interstadial warm events is proposed, with initial warming related to the northward advection of a thin warm surface layer within the North Atlantic Current, which only extended into deeper surface layers as the interstadial progressed. Benthic foraminifera isotope data also show millennialscale oscillations but of a different structure to the abrupt surface water changes. These changes are argued to partly be related to the influence of low- salinity deepwater brines. The influence of deepwater brines over the site of MD95- 2006 reached a maximum at times of rapid warming of surface waters. This observation supports the suggestion that brine formation may have helped to destabilize the accumulation of warm, saline surface waters at low latitudes, helping to force the MOC into a warm mode of operation. The contribution of deepwater brines relative to other mechanisms proposed to alter the state of the MOC needs to be examined further in future studies.

AB - [1] There is much uncertainty surrounding the mechanisms that forced the abrupt climate fluctuations found in many palaeoclimate records during Marine Isotope Stage (MIS)-3. One of the processes thought to be involved in these events is the Atlantic Meridional Overturning Circulation ( MOC), which exhibited large changes in its dominant mode throughout the last glacial period. Giant piston core MD95- 2006 from the northeast Atlantic Ocean records a suite of palaeoceanographic proxies related to the activity of both surface and deep water masses through a period of MIS- 3 when abrupt climate fluctuations were extremely pronounced. A two- stage progression of surface water warming during interstadial warm events is proposed, with initial warming related to the northward advection of a thin warm surface layer within the North Atlantic Current, which only extended into deeper surface layers as the interstadial progressed. Benthic foraminifera isotope data also show millennialscale oscillations but of a different structure to the abrupt surface water changes. These changes are argued to partly be related to the influence of low- salinity deepwater brines. The influence of deepwater brines over the site of MD95- 2006 reached a maximum at times of rapid warming of surface waters. This observation supports the suggestion that brine formation may have helped to destabilize the accumulation of warm, saline surface waters at low latitudes, helping to force the MOC into a warm mode of operation. The contribution of deepwater brines relative to other mechanisms proposed to alter the state of the MOC needs to be examined further in future studies.

KW - MARINE ISOTOPE STAGE-3

KW - ABRUPT CLIMATE-CHANGE

KW - LAST GLACIAL PERIOD

KW - SEA-SURFACE TEMPERATURES

KW - GREENLAND ICE-CORE

KW - PLANKTONIC-FORAMINIFERA

KW - THERMOHALINE CIRCULATION

KW - ICEBERG DISCHARGES

KW - OXYGEN-ISOTOPE

KW - RAPID CHANGES

UR - http://www.scopus.com/inward/record.url?scp=65649093998&partnerID=8YFLogxK

U2 - 10.1029/2008PA001595

DO - 10.1029/2008PA001595

M3 - Article

VL - 23

JO - Paleoceanography

T2 - Paleoceanography

JF - Paleoceanography

SN - 0883-8305

IS - 3

M1 - PA3206

ER -

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ID: 607471