Comparison of glacial and interglacial conditions between the polar and the subpolar North Atlantic Region over the past five climate cycles.

Helmke, Jan P. and Bauch, Henning A. (2003) Comparison of glacial and interglacial conditions between the polar and the subpolar North Atlantic Region over the past five climate cycles. Open Access Paleoceanography, 18 (2). p. 1036. DOI 10.1029/2002PA000794.

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Abstract

A multiparameter-based interpretation of sediment records from the northeast Atlantic and the western Nordic seas suggests that during the last 500,000 years only in marine isotopes stage (MIS) 11, 5e, and 1 were there somewhat comparable interglacial boundary conditions in both regions, i.e., strongly reduced occurrence of iceberg-rafted debris (IRD) and high carbonate bioproductivity. Although the northeast Atlantic experienced such conditions during all peak interglaciations, with the exception of MIS 7, planktic foraminiferal δ18O from this region would still indicate that significantly colder sea surface temperatures (SST) prevailed during MIS 11 than during MIS 9, 5e, and 1. This assumption is corroborated by a continuous input of IRD into the western Nordic seas during MIS 11, implying a much steeper SST gradient between the polar and subpolar region and an overall reduced thermohaline activity in the polar latitudes. The iceberg proxy also reveals that maximum IRD discharge always happened during the final phase of glaciation and into early deglaciation (terminations). As these IRD records from the two regions are characterized by a high time coherency, it is concluded that short-term variability is a persistent feature of the glacial climate system.

Document Type: Article
Keywords: North Atlantic; Polar and subpolar region; Late Pleistocene; Glacial-interglacial climates
Research affiliation: OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-P-OZ Paleo-Oceanography
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1029/2002PA000794
ISSN: 0883-8305
Projects: Laptev Sea System, Permafrost
Date Deposited: 18 Feb 2008 17:25
Last Modified: 10 May 2017 13:03
URI: http://oceanrep.geomar.de/id/eprint/6241

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