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

November 1, 2013

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.

Publication Year 2013
Title A 600-ka Arctic sea-ice record from Mendeleev Ridge based on ostracodes
DOI 10.1016/j.quascirev.2012.12.010
Authors Thomas M. Cronin, L.V. Polyak, D. Reed, E. S. Kandiano, R. E. Marzen, E. A. Council
Publication Type Article
Publication Subtype Journal Article
Series Title Quaternary Science Reviews
Index ID 70157131
Record Source USGS Publications Warehouse
USGS Organization Eastern Geology and Paleoclimate Science Center