Spätquartäre paläo-ozeanographische Entwicklung des Nordpolarmeeres und europäischen Nordmeeres anhand von Sauerstoff- und Kohlenstoff-Isotopenverhältnissen der planktischen Foraminifere : Neogloboquadrina pachyderma (sin.)

Köhler, Sabine E. I. (1992) Spätquartäre paläo-ozeanographische Entwicklung des Nordpolarmeeres und europäischen Nordmeeres anhand von Sauerstoff- und Kohlenstoff-Isotopenverhältnissen der planktischen Foraminifere : Neogloboquadrina pachyderma (sin.) (Doctoral thesis/PhD), Christian-Albrechts-Universität, Kiel, 104 pp

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Abstract

Oxygen and carbon isotope measurements were carried out on tests of planktic foraminilers N.
pachyderma (sin.) from eight sediment cores taken from the eastem Arctic Ocean, the Fram Strait, and
the Iceland Sea, in order to reconstruct Arctic Ocean and Norwegian-Greenland Sea circulation
patterns and ice covers during the last 130,000 years. ln addition, the influence of ice, temperature
and salinity effects on the isotopic signal was quantified. Isotope measurements on foraminifers from
sediment surface samples were used to elucidate the ecology of N. pachyderma (sin.).
Changes in the oxygen and carbon isotope composition of N. pachyderma (sin.) from sediment
surface samples document the horizontal and vertical changes of water mass boundaries controlled
by watertemperature and salinity, because N. pachyderma (sin.) shows drastic changes in depth
habitats, depending on the water mass properties.
It was able to be shown that in the investigated areas a regional and spatial apparent increase of the ice
effect occurred. This happened especially du ring the termination 1 by direct advection of meltwaters
from nearby continents or during the termination and in interglacials by supply of isotopically light water
from rivers. A northwardly proceeding overprint of the "global" ice effect, increasing from the
Norwegian-Greenland Sea to the Arctic Ocean, was not able to be demonstrated.
By means of a model the influence of temperature and salinity on the global ice volume signal during
the last 130.000 years was recorded. In combination with the results of this study, the model was the
basis for a reconstruction of the paleoceanographic development of the Arctic Ocean and the
Norwegian-Greenland Sea during this time interval.
The conception of a relatively thick and permanent sea ice cover in the Nordic Seas during glacial times
should be replaced by the model of a seasonally and regionally highly variable ice cover. Only during
isotope stage 5e may there have been a local deep water formation in the Fram Strait.

Document Type: Thesis (Doctoral thesis/PhD)
Thesis Advisors: Thiede, Jörn
Additional Information: Suppl: Age models and stable isotopes of sediment cores from the northern seas (doi:10.1594/PANGAEA.728605) - Der Datenanhang (Teil II ) kann als Kopie im GEOMAR Forschungszentrum für marine Geowissenschaften der Christian-Albrechts-Universität zu Kiel eingesehen werden (Bibliothek Ostufer).
Keywords: Arctic Ocean, Norwegian-Greenland Sea, circulation, N. pachyderma (sin.), late Quaternary, RV Poseidon, POS158/1, RV Meteor, RV Polarstern, RV Hakon Mosby
Research affiliation: OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-P-OZ Paleo-Oceanography
DOI etc.: 10.3289/GEOMAR_REP_13_1992
ISSN: 0936-5788
Related URLs:
Expeditions/Models:
Date Deposited: 10 Dec 2015 09:20
Last Modified: 14 Jan 2016 08:56
URI: http://eprints.uni-kiel.de/id/eprint/30472

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