Geochemical investigations of sediment profiles in the Norwegian-Greenland Sea

• Main Author: Voelker, Antje H L
• Format: Other/Unknown Material
• Language: English
• Published: PANGAEA 2011
• Subjects: Arctic Ocean; ARK-X/2; AWI_Paleo; Denmark Strait; Giant box corer; GIK/IfG; GIK23071-2; GIK23071-3; GIK23074-1; GIK23074-3; GIK23351-1; GIK23351-4; GIK23354-4; GIK23354-6; GKG; GLAMAP; Global Environmental Change: The Northern North Atlantic; Gravity corer (Kiel type); Institute for Geosciences; Christian Albrechts University; Kiel; KAL; Kasten corer; M2/2; M7/5; Meteor (1986); Norwegian-Greenland Sea; Norwegian Sea; Paleoenvironmental Reconstructions from Marine Sediments @ AWI; Polarstern; PS2613-1; PS2613-6; PS2616-7; PS2644-2; PS2644-5; PS2645-2; PS2645-5; PS2646-2; PS2646-5; PS2647-2; PS2647-5; PS31; PS31/113; PS31/116; PS31/160; PS31/160-5; PS31/161; PS31/162; PS31/163; Quaternary Environment of the Eurasian North; Dansgaard-Oeschger events; Greenland; Greenland Sea; ice core; Iceland; Nordic Seas; North Atlantic
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.771756; https://doi.org/10.1594/PANGAEA.771756

High-, i.e. 15-140-yr-resolution climate records from sediment cores 23071, 23074, and PS2644 from the Nordic Seas were used to recon:;truct changes in the surface and deep water circulation during marine isotope stages 1-5.1, i.e. the last 82 000 yr. From this the causal links between the paleoceanographic signals and the Dansgaard-Oeschger events 1-21 revealed in 0180-ice-core records from Greenland were determined. The stratigraphy of the cores is based on the planktic 0180 curves, the minima of which were directly correlated with the GISP2-0180 record, numerous AMS 14C ages, and some ash layers. The planktic d18O and dl3C curves of all three cores reveal numerous meltwater events, the most pronounced of which were assigned to the Heinrich events 1-6. The meltwater events, among other things also accompanied by cold sea surface temperatures and high IRD concentration, correlate with the stadial phases of the Dansgaard-Oeschger cycles and in the western Iceland Sea also to colder periods or abrupt drops in 0180 within a few longer interstadials. Besides being more numerous, the meltwater events also show isotope values lighter in the Iceland Sea than in the central Norwegian Sea, especially if compared to core 23071. This implies a continuous inflow of relative warm Atlantic water into the Norwegian Sea and a cyclonic circulation regime.