Paleoceanographical studies of MIS 11 for sediment core MD99-2277

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 t...

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Bibliographic Details
Main Authors: Kandiano, Evgenia S, van der Meer, Marcel T J, Bauch, Henning A, Helmke, Jan Peter, Sinninghe Damsté, Jaap S, Schouten, Stefan
Format: Dataset
Language:English
Published: PANGAEA 2016
Subjects:
61F
AGE
CALYPSO
Calypso Corer
DEPTH
sediment/rock
Difference
Dissimilarity index
IMAGES V
Jan Mayen Ridge
Marion Dufresne (1995)
MD114
MD99-2277
Neogloboquadrina pachyderma sinistral
Sea surface temperature
summer
Turborotalita quinqueloba
δ Deuterium
Alkenone
C37
standard deviation
Arctic
Arctic Ocean
Greenland
Jan Mayen
Foraminifera*
Neogloboquadrina pachyderma
Nordic Seas
North Atlantic
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.865410
https://doi.org/10.1594/PANGAEA.865410
Description
Summary: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.

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