Spätquartäre paläo-ozeanographische Entwicklung des Nordpolarmeeres und Europäischen Nordmeeres anhand von Sauerstoff- und Kohlenstoff-isotopenverhältnissen der planktischen Foraminifere Neogloboquadrina pachyderma (sin.)
Oxygen and carbon isotope measurements were carried out on tests of planktic foraminifers N. pachyderma (sin.) from eight sediment cores taken from the eastern Arctic Ocean, the Fram Strait, and the leeland Sea, in order to reconstruct Arctic Ocean and Norwegian-Greenland Sea circulation patterns an...
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ftawi:oai:epic.awi.de:21122 2024-09-15T17:53:14+00:00 Spätquartäre paläo-ozeanographische Entwicklung des Nordpolarmeeres und Europäischen Nordmeeres anhand von Sauerstoff- und Kohlenstoff-isotopenverhältnissen der planktischen Foraminifere Neogloboquadrina pachyderma (sin.) Köhler, Sabine 1991 application/pdf https://epic.awi.de/id/eprint/21122/ https://epic.awi.de/id/eprint/21122/1/Khl1991a.pdf https://hdl.handle.net/10013/epic.33412 https://hdl.handle.net/10013/epic.33412.d001 unknown https://epic.awi.de/id/eprint/21122/1/Khl1991a.pdf https://hdl.handle.net/10013/epic.33412.d001 Köhler, S. (1991) Spätquartäre paläo-ozeanographische Entwicklung des Nordpolarmeeres und Europäischen Nordmeeres anhand von Sauerstoff- und Kohlenstoff-isotopenverhältnissen der planktischen Foraminifere Neogloboquadrina pachyderma (sin.) , PhD thesis, Christian-Albrechts-Universität Kiel. hdl:10013/epic.33412 EPIC3MATHEMATISCH-NATURWISSENSCHAFTLICHE FAKULTÄT DER CHRISTIAN·ALBRECHTS-UNIVERSITÄT ZU KIEL, 104 p. Thesis notRev 1991 ftawi 2024-06-24T04:01:33Z Oxygen and carbon isotope measurements were carried out on tests of planktic foraminifers N. pachyderma (sin.) from eight sediment cores taken from the eastern Arctic Ocean, the Fram Strait, and the leeland Sea, in order to reconstruct Arctic Ocean and Norwegian-Greenland Sea circulation patterns and ice covers during the last 130,000 years. In addition, the influence of ice, temperature and salinity effects on the isotopic signal was quantified. Isotope measurements on foraminifers from sediment surface sampies 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 sampies document the horizontal and vertical changes of water mass boundaries controlled by water temperature 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 during the termination I 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. Thesis Arctic Ocean Fram Strait Greenland Greenland Sea Neogloboquadrina pachyderma Nordic Seas Nordpol* Sea ice Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
institution |
Open Polar |
collection |
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
Oxygen and carbon isotope measurements were carried out on tests of planktic foraminifers N. pachyderma (sin.) from eight sediment cores taken from the eastern Arctic Ocean, the Fram Strait, and the leeland Sea, in order to reconstruct Arctic Ocean and Norwegian-Greenland Sea circulation patterns and ice covers during the last 130,000 years. In addition, the influence of ice, temperature and salinity effects on the isotopic signal was quantified. Isotope measurements on foraminifers from sediment surface sampies 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 sampies document the horizontal and vertical changes of water mass boundaries controlled by water temperature 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 during the termination I 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. |
format |
Thesis |
author |
Köhler, Sabine |
spellingShingle |
Köhler, Sabine Spätquartäre paläo-ozeanographische Entwicklung des Nordpolarmeeres und Europäischen Nordmeeres anhand von Sauerstoff- und Kohlenstoff-isotopenverhältnissen der planktischen Foraminifere Neogloboquadrina pachyderma (sin.) |
author_facet |
Köhler, Sabine |
author_sort |
Köhler, Sabine |
title |
Spätquartäre paläo-ozeanographische Entwicklung des Nordpolarmeeres und Europäischen Nordmeeres anhand von Sauerstoff- und Kohlenstoff-isotopenverhältnissen der planktischen Foraminifere Neogloboquadrina pachyderma (sin.) |
title_short |
Spätquartäre paläo-ozeanographische Entwicklung des Nordpolarmeeres und Europäischen Nordmeeres anhand von Sauerstoff- und Kohlenstoff-isotopenverhältnissen der planktischen Foraminifere Neogloboquadrina pachyderma (sin.) |
title_full |
Spätquartäre paläo-ozeanographische Entwicklung des Nordpolarmeeres und Europäischen Nordmeeres anhand von Sauerstoff- und Kohlenstoff-isotopenverhältnissen der planktischen Foraminifere Neogloboquadrina pachyderma (sin.) |
title_fullStr |
Spätquartäre paläo-ozeanographische Entwicklung des Nordpolarmeeres und Europäischen Nordmeeres anhand von Sauerstoff- und Kohlenstoff-isotopenverhältnissen der planktischen Foraminifere Neogloboquadrina pachyderma (sin.) |
title_full_unstemmed |
Spätquartäre paläo-ozeanographische Entwicklung des Nordpolarmeeres und Europäischen Nordmeeres anhand von Sauerstoff- und Kohlenstoff-isotopenverhältnissen der planktischen Foraminifere Neogloboquadrina pachyderma (sin.) |
title_sort |
spätquartäre paläo-ozeanographische entwicklung des nordpolarmeeres und europäischen nordmeeres anhand von sauerstoff- und kohlenstoff-isotopenverhältnissen der planktischen foraminifere neogloboquadrina pachyderma (sin.) |
publishDate |
1991 |
url |
https://epic.awi.de/id/eprint/21122/ https://epic.awi.de/id/eprint/21122/1/Khl1991a.pdf https://hdl.handle.net/10013/epic.33412 https://hdl.handle.net/10013/epic.33412.d001 |
genre |
Arctic Ocean Fram Strait Greenland Greenland Sea Neogloboquadrina pachyderma Nordic Seas Nordpol* Sea ice |
genre_facet |
Arctic Ocean Fram Strait Greenland Greenland Sea Neogloboquadrina pachyderma Nordic Seas Nordpol* Sea ice |
op_source |
EPIC3MATHEMATISCH-NATURWISSENSCHAFTLICHE FAKULTÄT DER CHRISTIAN·ALBRECHTS-UNIVERSITÄT ZU KIEL, 104 p. |
op_relation |
https://epic.awi.de/id/eprint/21122/1/Khl1991a.pdf https://hdl.handle.net/10013/epic.33412.d001 Köhler, S. (1991) Spätquartäre paläo-ozeanographische Entwicklung des Nordpolarmeeres und Europäischen Nordmeeres anhand von Sauerstoff- und Kohlenstoff-isotopenverhältnissen der planktischen Foraminifere Neogloboquadrina pachyderma (sin.) , PhD thesis, Christian-Albrechts-Universität Kiel. hdl:10013/epic.33412 |
_version_ |
1810295248294772736 |