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Haley, Brian A; Frank, Martin; Spielhagen, Robert F; Eisenhauer, Anton (2008): Neodymium and Strontium chemistry of Arctic Ocean sediments. PANGAEA,, Supplement to: Haley, BA et al. (2008): Influence of brine formation on Arctic Ocean circulation over the past 15 million years. Nature Geoscience, 1, 68-72,

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The early oceanographic history of the Arctic Ocean is important in regulating, and responding to, climatic changes. However, constraints on its oceanographic history preceding the Quaternary (the past 1.8 Myr) have become available only recently, because of the difficulties associated with obtaining continuous sediment records in such a hostile setting. Here, we use the neodymium isotope compositions of two sediment cores recovered near the North Pole to reconstruct over the past ~5 Myr the sources contributing to Arctic Intermediate Water, a water mass found today at depths of 200 to 1,500 m. We interpret high neodymium ratios for the period between 15 and 2 Myr ago, and for the glacial periods thereafter, as indicative of weathering input from the Siberian Putoranan basalts into the Arctic Ocean. Arctic Intermediate Water was then derived from brine formation in the Eurasian shelf regions, with only a limited contribution of intermediate water from the North Atlantic. In contrast, the modern circulation pattern, with relatively high contributions of North Atlantic Intermediate Water and negligible input from brine formation, exhibits low neodymium isotope ratios and is typical for the interglacial periods of the past 2 Myr. We suggest that changes in climatic conditions and the tectonic setting were responsible for switches between these two modes.
Median Latitude: 87.972785 * Median Longitude: 123.609271 * South-bound Latitude: 86.241800 * West-bound Longitude: 32.973333 * North-bound Latitude: 89.986667 * East-bound Longitude: 144.166200
Date/Time Start: 1991-08-13T00:00:00 * Date/Time End: 2001-09-06T19:52:00
302-CompSite * Latitude: 87.890000 * Longitude: 137.650000 * Elevation: -1251.0 m * Campaign: Exp302 (Arctic Coring Expedition, ACEX) * Basis: Vidar Viking * Device: Composite Core (COMPCORE) * Comment: Virtual core composed of spliced cores from Holes M0002A, M0003A, M0004A and M0004C. Virtual position and water depth is calculated as the mean of all Exp302 sites.
PS2163-2 (PS19/157) * Latitude: 86.241800 * Longitude: 59.215000 * Date/Time: 1991-08-13T00:00:00 * Elevation: -3040.0 m * Penetration: 0.23 m * Recovery: 0.23 m * Location: Gakkel Ridge, Arctic Ocean * Campaign: ARK-VIII/3 (PS19 ARCTIC91) * Basis: Polarstern * Device: Giant box corer (GKG)
PS2171-1 (PS19/166) * Latitude: 87.585700 * Longitude: 68.977200 * Date/Time: 1991-08-19T00:00:00 * Elevation: -4384.0 m * Penetration: 0.5 m * Recovery: 0.58 m * Location: Amundsen Basin * Campaign: ARK-VIII/3 (PS19 ARCTIC91) * Basis: Polarstern * Device: Giant box corer (GKG)
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