Evidence for delayed poleward expansion of North Atlantic surface waters during the last interglacial (MIS 5e).

Van Nieuwenhove, Nicolas, Bauch, Henning A., Eynaud, Frédérique, Kandiano, Evguenia, Cortijo, Elsa and Turon, Jean-Louis (2011) Evidence for delayed poleward expansion of North Atlantic surface waters during the last interglacial (MIS 5e). Quaternary Science Reviews, 30 (7-8). pp. 934-946. DOI 10.1016/j.quascirev.2011.01.013.

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Abstract

The Last Interglacial (Marine Isotopic Stage or MIS 5e) surface ocean heat flux from the Rockall Basin (NE Atlantic) towards the Arctic Ocean was reconstructed by analysing dinoflagellate cyst (dinocyst) assemblages in four sediment cores. Together with records of stable isotopes and ice-rafted detritus, the assemblage data reflect the northward retreat of ice(berg)-laden waters and the gradual development towards interglacial conditions at the transition from the Saalian deglaciation (Termination II) into MIS 5e. At the Rockall Basin, this onset of the Last Interglacial is soon followed by the appearance of the thermophilic dinocyst species Spiniferites mirabilis, with relative abundances higher than those observed at present in the area. North of the Iceland-Scotland Ridge, however, S. mirabilis only appears in significant numbers during late MIS 5e, between not, vert, similar118 and 116.5 ka. Hence, fully marine Last Interglacial conditions with most intense Atlantic surface water influence occurred during late MIS 5e in the Nordic seas, and consequently also farther north in the Arctic Ocean, and at times when northern hemisphere summer insolation was already significantly decreased. The stratigraphic position of this Late Interglacial optimum is supported by planktic foraminifers and contrasts with the timing of the early Holocene climatic optimum in this area. We interpret the delayed northward expansion of Atlantic waters towards the polar latitudes as a result of the Saalian ice sheet deglaciation and its specific impact on the subsequent water mass evolution in this region.

Document Type: Article
Keywords: Paleoceanography; Last Interglacial, MIS 5e, Dinoflagellate cysts, North Atlantic, Nordic seas
Research affiliation: OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-P-OZ Paleo-Oceanography
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1016/j.quascirev.2011.01.013
ISSN: 0277-3791
Date Deposited: 09 Sep 2011 10:25
Last Modified: 16 Sep 2016 08:14
URI: http://oceanrep.geomar.de/id/eprint/12121

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