Sedimentology and stable carbon and oxygen isotope record of the Central Arctic ...

• Main Authors: Nørgaard-Pedersen, Niels, Spielhagen, Robert F, Thiede, Jörn, Kassens, Heidemarie
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 1998
• Subjects: Giant box corer; ARK-VIII/3; Polarstern; Helmholtz Centre for Ocean Research Kiel GEOMAR; Quaternary Environment of the Eurasian North QUEEN; Arctic Ocean; Barents Sea; Ice Sheet; Sea ice
• Online Access: https://dx.doi.org/10.1594/pangaea.733504; https://doi.pangaea.de/10.1594/PANGAEA.733504

Stable oxygen and carbon isotope and sedimentological-paleontological investigations supported by accelerator mass spectrometry 14C datings were carried out on cores from north of 85°N in the eastern central Arctic Ocean. Significant changes in accumulation rates, provenance of ice-rafted debris (IRD), and planktic productivity over the past 80,000 years are documented. During peak glacials, i.e., oxygen isotope stages 4 and 2, the Arctic Ocean was covered by sea ice with decreased seasonal variation, limiting planktic productivity and bulk sedimentation rates. In early stage 3 and during Termination I, major deglaciations of the circum-Arctic regions caused lowered salinities and poor oxygenation of central Arctic surface waters. A meltwater spike and an associated IRD peak dated to ~14-12 14C ka can be traced over the southern Eurasian Basin of the Arctic Ocean. This event was associated with the early and rapid deglaciation of the marine-based Barents Sea Ice Sheet. A separate Termination Ib meltwater ... : Supplement to: Nørgaard-Pedersen, Niels; Spielhagen, Robert F; Thiede, Jörn; Kassens, Heidemarie (1998): Central Arctic surface ocean environment during the past 80,000 years. Paleoceanography, 13(2), 193-204 ...