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New Faunal and Isotopic Evidence on the Late Weichselian—Holocene Oceanographic Changes in the Norwegian Sea1

Published online by Cambridge University Press:  20 January 2017

Hans Petter Sejrup ,
Eystein Jansen ,
Helmut Erlenkeuser  and
Hans Holtedahl
Hans Petter Sejrup
Affiliation:
Geological Institute, Department B, University of Bergen, Allegt, 41, 5000 Bergen-University, Norway
Eystein Jansen
Affiliation:
Geological Institute, Department B, University of Bergen, Allegt, 41, 5000 Bergen-University, Norway
Helmut Erlenkeuser
Affiliation:
Institute of Nuclear Physics, 14C-Laboratory, University of Kiel, Olshausenstr. 40-60, D-2300 Kiel, West Germany
Hans Holtedahl
Affiliation:
Geological Institute, Department B, University of Bergen, Allegt, 41, 5000 Bergen-University, Norway
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Abstract

Downcore studies of planktonic and benthonic foraminifera and δ18O and δ13C in the planktonic foraminifer Neogloboquadrina pachyderma (sin.) in two piston cores from the southern part of the Norwegian Sea suggest large changes in the oceanic circulation pattern at the end of oxygenisotope stage 2 and in the early part of stage 1. Prior to oxygen-isotope Termination IA (16,000–13,000 yr B.P.), an isolated watermass with lower oxygen content and temperature warmer than today existed below a low salinity ice-covered surface layer in the Norwegian Sea. Close to Termination IA, well-oxygenated deep water, probably with positive temperatures, was introduced. This deep water, which must have had physical and/or chemical parameters different from those of present deep water in the Norwegian Sea, could have been introduced from the North Atlantic or been formed within the basin by another mechanism than that which forms the present deep water of the Norwegian Sea. A seasonal ice cover in the southern part of the Norwegian Sea is proposed for the period between Termination IA and the beginning of IB (close to 10,000 yr B.P.). The present situation, with strong influx of warm Atlantic surface-water and deep-water formation by surface cooling, was established at Termination IB.

Type
Research Article
Information
Quaternary Research , Volume 21 , Issue 1 , January 1984 , pp. 74 - 84
Copyright
University of Washington

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Footnotes

1

Contribution No. 414 of the Sonderforchungsbereich 95 “Interaction Sea-Sea Bottom” from the University of Kiel.

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