Paleoceanographical studies of MIS 11 for sediment core MD99-2277, supplement to: Kandiano, Evgenia S; van der Meer, Marcel T J; Bauch, Henning A; Helmke, Jan Peter; Sinninghe Damsté, Jaap S; Schouten, Stefan (2016): A cold and fresh ocean surface in the Nordic Seas during MIS 11: Significance for the future ocean. Geophysical Research Letters, 43(20), 10929-10937


Paleoceanographical studies of Marine Isotope Stage (MIS) 11 have revealed higher-than-present sea surface temperatures (SSTs) in the North Atlantic and in parts of the Arctic, but lower-than-present SSTs in the Nordic Seas, the main throughflow-area of warm water into the Arctic Ocean. We resolve this contradiction by complementing SST data based on planktic foraminiferal abundances with surface salinity changes using hydrogen isotopic compositions of alkenones in a core from the central Nordic Seas. The data indicate the prevalence of a relatively cold, low-salinity, surface water layer in the Nordic Seas during most of MIS 11. In spite of the low-density surface layer, which was kept buoyant by continuous melting of surrounding glaciers, warmer Atlantic water was still propagating northward at the subsurface thus maintaining meridional overturning circulation. This study can help to better constrain the impact of continuous melting of Greenland and Arctic ice on high-latitude ocean circulation and climate.

Metadata Access
Creator Helmke, Jan Peter;Schouten, Stefan;Kandiano, Evgenia S;Bauch, Henning A;van der Meer, Marcel T J;Sinninghe Damsté, Jaap S
Publisher PANGAEA - Data Publisher for Earth & Environmental Science
Publication Year 2016
Rights Creative Commons Attribution 3.0 Unported (CC-BY)
Language English
Resource Type Supplementary Dataset
Format text/tab-separated-values
Discipline Earth System Research
Spatial Coverage (69N,6 W)
Temporal Point 1999-08-01T11:59:59Z