A 600-ka Arctic sea-ice record from Mendeleev Ridge based on ostracodes
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Abstract
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 type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | A 600-ka Arctic sea-ice record from Mendeleev Ridge based on ostracodes |
| Series title | Quaternary Science Reviews |
| DOI | 10.1016/j.quascirev.2012.12.010 |
| Volume | 79 |
| Year Published | 2013 |
| Language | English |
| Publisher | Pergamon Press |
| Publisher location | New York, NY |
| Contributing office(s) | Eastern Geology and Paleoclimate Science Center |
| Description | 11 p. |
| First page | 157 |
| Last page | 167 |
| Online Only (Y/N) | N |
| Additional Online Files (Y/N) | N |
| Google Analytic Metrics | Metrics page |