A 600-ka Arctic sea-ice record from Mendeleev Ridge based on ostracodes

Cronin, T. M., Polyak, L., Reed, D., Kandiano, Evgeniya S., Marzen, R. E. and Council, E. A. (2013) A 600-ka Arctic sea-ice record from Mendeleev Ridge based on ostracodes Quaternary Science Reviews, 79 . pp. 157-167. DOI 10.1016/j.quascirev.2012.12.010.

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Arctic paleoceanography and sea-ice history were reconstructed from epipelagic and benthic ostracodes from a sediment core (HLY0503-06JPC, 800 m water depth) located on the Mendeleev Ridge, Western Arctic Ocean. The calcareous microfaunal record (ostracodes and foraminifers) covers several glacial/interglacial cycles back to estimated Marine Isotope Stage 13 (MIS 13, ∼500 ka) with an average sedimentation rate of ∼0.5 cm/ka for most of the stratigraphy (MIS 5–13). Results based on ostracode assemblages and an unusual planktic foraminiferal assemblage in MIS 11 dominated by a temperate-water species Turborotalita egelida show that extreme interglacial warmth, high surface ocean productivity, and possibly open ocean convection characterized MIS 11 and MIS 13 (∼400 and 500 ka, respectively). A major shift in western Arctic Ocean environments toward perennial sea ice occurred after MIS 11 based on the distribution of an ice-dwelling ostracode Acetabulastoma arcticum. Spectral analyses of the ostracode assemblages indicate sea ice and mid-depth ocean circulation in western Arctic Ocean varied primarily at precessional (∼22 ka) and obliquity (∼40 ka) frequencies.

Document Type: Article
Additional Information: WOS:000327909900014
Keywords: Arctic sea ice; Arctic paleoceanography; Marine Isotope Stage 11; Ostracodes
Research affiliation: OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-P-OZ Paleo-Oceanography
Refereed: Yes
DOI etc.: 10.1016/j.quascirev.2012.12.010
ISSN: 0277-3791
Date Deposited: 14 Nov 2013 09:29
Last Modified: 16 Sep 2016 08:05
URI: http://eprints.uni-kiel.de/id/eprint/22422

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