Stable oxygen isotope composition of benthic foraminifera from sediments of the Skagerrak, North Sea ...

• Main Authors: Brückner, Sylvia, Mackensen, Andreas
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2006
• Subjects: Gravity corer; AL159; Alkor 1990; Paleoenvironmental Reconstructions from Marine Sediments @ AWI AWI_Paleo; North Atlantic; North Atlantic oscillation
• Online Access: https://dx.doi.org/10.1594/pangaea.676724; https://doi.pangaea.de/10.1594/PANGAEA.676724

Benthic foraminiferal tests of a sediment core from southwestern Skagerrak (northeastern North Sea, 420 m water depth) were investigated for their ratio of stable oxygen isotopes. During modern times sudden drops in temperature and salinity of Skagerrak deep waters point to advection-induced cascades of colder and denser central North Sea waters entering the Skagerrak. These temperature drops, which are recorded in benthic foraminiferal tests via the stable oxygen isotopic composition, were used to reconstruct deep-water renewal in the Skagerrak. In a second step we will show that, at least during the last 1200 years, Skagerrak deep-water renewal is triggered by the negative phase of the North Atlantic Oscillation (NAO). The NAO exerts a strong influence on the climate of northwestern Europe. It is currently under debate if the long-term variability of the NAO is capable of influencing Northern Hemisphere climate on long timescales. The data presented here cannot reinforce these speculations. Our data show ... : Project: Integrated Baltic Sea Environmental Study (IBSEN); funded by German Ministry of Education and Research (BMBF) ...