Planktonic isotope record and clay mineralogy of sediment core PS2138-1 ...

• Main Authors: Knies, Jochen, Vogt, Christoph
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2003
• Subjects: Gravity corer Kiel type; ARK-VIII/2; Polarstern; Paleoenvironmental Reconstructions from Marine Sediments @ AWI AWI_Paleo; Quaternary Environment of the Eurasian North QUEEN; Arctic Ocean; Barents Sea; Fram Strait; Ice Sheet; Iceberg*; Nordic Seas; Sea ice
• Online Access: https://dx.doi.org/10.1594/pangaea.736919; https://doi.pangaea.de/10.1594/PANGAEA.736919

Improved multiparameter records from the northern Barents Sea margin show two prominent freshwater pulses into the Arctic Ocean during MIS 5 that significantly disturbed the regional oceanic regime and probably affected global climate. Both pulses are associated with major iceberg-rafted debris (IRD) events, revealing intensive iceberg/sea ice melting. The older meltwater pulse occurred near the MIS 5/6 boundary (~131,000 yr ago); its ~2000 year duration and high IRD input accompanied by high illite content suggest a collapse of large-scale Saalian Glaciation in the Arctic Ocean. Movement of this meltwater with the Transpolar Drift current into the Fram Strait probably promoted freshening of Nordic Seas surface water, which may have increased sea-ice formation and significantly reduced deep-water formation. A second pulse of freshwater occurred within MIS 5a (~77,000 yr ago); its high smectite content and relatively short duration is possibly consistent with sudden discharge of Early Weichselian ice-dammed ... : Supplement to: Knies, Jochen; Vogt, Christoph (2003): Freshwater pulses in the eastern Arctic Ocean during Saalian and Early Weichselian ice-sheet collapse. Quaternary Research, 60(3), 243-251 ...