A fresh look at the glacial Arctic Ocean
The seafloor morphology of the Arctic Ocean and the Nordic Seas show specific capped structures in water depths of up to 1000 m. Together with modelling results, they strongly point to the existence of ice shelves covering the interior of the Arctic Ocean in past glacials[1,2]. In an attempt to link...
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Geochemical Society
2021
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ftawi:oai:epic.awi.de:54358 2023-05-15T14:27:17+02:00 A fresh look at the glacial Arctic Ocean Geibert, Walter Matthießen, Jens Stimac, Ingrid Wollenburg, Jutta Stein, Rüdiger 2021-07-05 https://epic.awi.de/id/eprint/54358/ https://hdl.handle.net/10013/epic.3b861445-9c04-4822-8924-9de5af32387d unknown Geochemical Society Geibert, W. orcid:0000-0001-8646-2334 , Matthießen, J. orcid:0000-0002-6952-2494 , Stimac, I. orcid:0000-0001-6053-2330 , Wollenburg, J. orcid:0000-0002-8169-8310 and Stein, R. orcid:0000-0002-4453-9564 (2021) A fresh look at the glacial Arctic Ocean , Goldschmidt2021, Lyon/Virtual, 4 July 2021 - 9 July 2021 . hdl:10013/epic.3b861445-9c04-4822-8924-9de5af32387d EPIC3Goldschmidt2021, Lyon/Virtual, 2021-07-04-2021-07-09Lyon, Geochemical Society Conference notRev 2021 ftawi 2021-12-24T15:46:24Z The seafloor morphology of the Arctic Ocean and the Nordic Seas show specific capped structures in water depths of up to 1000 m. Together with modelling results, they strongly point to the existence of ice shelves covering the interior of the Arctic Ocean in past glacials[1,2]. In an attempt to link these major events to the sedimentary archive, we study a selection of new and existing data from many parts of the Arctic Ocean. We present activities of 230Th together with 234U/238U ratios, the concentrations of manganese, sulphur and calcium in the context of lithological information, and we show records of microfossils and their isotope composition. New high resolution analyses (PS51/038, PS72/396) and a re-analysis of existing marine sediment records (PS1533, PS1235, PS2185, PS2200, amongst others) in view of the naturally occurring radionuclide 230Thex and, where available, 10Be from the Arctic Ocean and the Nordic Seas reveal the widespread occurrence of intervals that are best explained by the temporary absence of sea water. [3]. We present a scenario of glacial conditions in which Bering Strait is closed and the Greenland-Scotland Ridge partly blocked by ice, leading to an accumulation of freshwater in liquid and solid form in the Arctic. This would explain how floating Arctic ice sheets, together with eustatic sea-level changes, have affected the past situation of the Arctic Ocean in a fundamental way that must have led to a drastic and non-linear response to certain threshold values, in agreement with sudden events in the climate record that were missing plausible explanations so far. This concept can reconcile contrasting age models for the Late Pleistocene in the Arctic Ocean. Our view, if adopted, would allow a coherent dating approach across the Arctic Ocean and the Nordic Seas, also offering a new perspective on climate records from lower latitudes. Conference Object Arctic Arctic Arctic Ocean Bering Strait Greenland Greenland-Scotland Ridge Ice Shelves Nordic Seas Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Arctic Arctic Ocean Bering Strait Greenland |
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Open Polar |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
The seafloor morphology of the Arctic Ocean and the Nordic Seas show specific capped structures in water depths of up to 1000 m. Together with modelling results, they strongly point to the existence of ice shelves covering the interior of the Arctic Ocean in past glacials[1,2]. In an attempt to link these major events to the sedimentary archive, we study a selection of new and existing data from many parts of the Arctic Ocean. We present activities of 230Th together with 234U/238U ratios, the concentrations of manganese, sulphur and calcium in the context of lithological information, and we show records of microfossils and their isotope composition. New high resolution analyses (PS51/038, PS72/396) and a re-analysis of existing marine sediment records (PS1533, PS1235, PS2185, PS2200, amongst others) in view of the naturally occurring radionuclide 230Thex and, where available, 10Be from the Arctic Ocean and the Nordic Seas reveal the widespread occurrence of intervals that are best explained by the temporary absence of sea water. [3]. We present a scenario of glacial conditions in which Bering Strait is closed and the Greenland-Scotland Ridge partly blocked by ice, leading to an accumulation of freshwater in liquid and solid form in the Arctic. This would explain how floating Arctic ice sheets, together with eustatic sea-level changes, have affected the past situation of the Arctic Ocean in a fundamental way that must have led to a drastic and non-linear response to certain threshold values, in agreement with sudden events in the climate record that were missing plausible explanations so far. This concept can reconcile contrasting age models for the Late Pleistocene in the Arctic Ocean. Our view, if adopted, would allow a coherent dating approach across the Arctic Ocean and the Nordic Seas, also offering a new perspective on climate records from lower latitudes. |
format |
Conference Object |
author |
Geibert, Walter Matthießen, Jens Stimac, Ingrid Wollenburg, Jutta Stein, Rüdiger |
spellingShingle |
Geibert, Walter Matthießen, Jens Stimac, Ingrid Wollenburg, Jutta Stein, Rüdiger A fresh look at the glacial Arctic Ocean |
author_facet |
Geibert, Walter Matthießen, Jens Stimac, Ingrid Wollenburg, Jutta Stein, Rüdiger |
author_sort |
Geibert, Walter |
title |
A fresh look at the glacial Arctic Ocean |
title_short |
A fresh look at the glacial Arctic Ocean |
title_full |
A fresh look at the glacial Arctic Ocean |
title_fullStr |
A fresh look at the glacial Arctic Ocean |
title_full_unstemmed |
A fresh look at the glacial Arctic Ocean |
title_sort |
fresh look at the glacial arctic ocean |
publisher |
Geochemical Society |
publishDate |
2021 |
url |
https://epic.awi.de/id/eprint/54358/ https://hdl.handle.net/10013/epic.3b861445-9c04-4822-8924-9de5af32387d |
geographic |
Arctic Arctic Ocean Bering Strait Greenland |
geographic_facet |
Arctic Arctic Ocean Bering Strait Greenland |
genre |
Arctic Arctic Arctic Ocean Bering Strait Greenland Greenland-Scotland Ridge Ice Shelves Nordic Seas |
genre_facet |
Arctic Arctic Arctic Ocean Bering Strait Greenland Greenland-Scotland Ridge Ice Shelves Nordic Seas |
op_source |
EPIC3Goldschmidt2021, Lyon/Virtual, 2021-07-04-2021-07-09Lyon, Geochemical Society |
op_relation |
Geibert, W. orcid:0000-0001-8646-2334 , Matthießen, J. orcid:0000-0002-6952-2494 , Stimac, I. orcid:0000-0001-6053-2330 , Wollenburg, J. orcid:0000-0002-8169-8310 and Stein, R. orcid:0000-0002-4453-9564 (2021) A fresh look at the glacial Arctic Ocean , Goldschmidt2021, Lyon/Virtual, 4 July 2021 - 9 July 2021 . hdl:10013/epic.3b861445-9c04-4822-8924-9de5af32387d |
_version_ |
1766300929329463296 |