Stable carbon and oxygen isotope ratios of foraminifera from Holocene sediments of the North Atlantic ...

• Main Authors: Millo, Christian, Sarnthein, Michael, Voelker, Antje H L, Erlenkeuser, Helmut
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2006
• Subjects: Ocean Gateways; Oceanpassagen; Giant box corer; Gravity corer Kiel type; Piston corer; POS210/2; ARK-XVIII/1; Poseidon; Polarstern; Impact of Gateways on Ocean Circulation, Climate, and Evolution OceanGateways; Denmark Strait; Nordic Seas; north atlantic current; North Atlantic
• Online Access: https://dx.doi.org/10.1594/pangaea.727694; https://doi.pangaea.de/10.1594/PANGAEA.727694

The Denmark Strait Overflow (DSO) today compensates for the northward flowing Norwegian and Irminger branches of the North Atlantic Current that drive the Nordic heat pump. During the Last Glacial Maximum (LGM), ice sheets constricted the Denmark Strait aperture in addition to ice eustatic/isostatic effects which reduced its depth (today ~630 m) by ~130 m. These factors, combined with a reduced north-south density gradient of the water-masses, are expected to have restricted or even reversed the LGM DSO intensity. To better constrain these boundary conditions, we present a first reconstruction of the glacial DSO, using four new and four published epibenthic and planktic stable-isotope records from sites to the north and south of the Denmark Strait. The spatial and temporal distribution of epibenthic delta18O and delta13C maxima reveals a north-south density gradient at intermediate water depths from sigma0 ~28.7 to 28.4/28.1 and suggests that dense and highly ventilated water was convected in the Nordic Seas ... : Supplement to: Millo, Christian; Sarnthein, Michael; Voelker, Antje H L; Erlenkeuser, Helmut (2006): Variability of the Denmark Strait Overflow during the Last Glacial Maximum. Boreas, 35(1), 50-60 ...