A 1.3-Myr palaeoceanographic record from the continental margin off Dronning Maud Land, Antarctica
A 12.5 m long core was retrieved from the continental margin off Dronning Maud Land, Antarctica. Magnetostratigraphy, stable isotopes, 14C accelerator mass spectrometer and amino acid analyses indicate a continuous sediment record going back 1.3 Myr. Comparison of CaCO3 results with those from ODP S...
Published in: | Palaeogeography, Palaeoclimatology, Palaeoecology |
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Format: | Article in Journal/Newspaper |
Language: | English |
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Online Access: | https://hdl.handle.net/1956/380 https://doi.org/10.1016/s0031-0182(03)00402-4 |
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ftunivbergen:oai:bora.uib.no:1956/380 2023-05-15T14:10:31+02:00 A 1.3-Myr palaeoceanographic record from the continental margin off Dronning Maud Land, Antarctica Forsberg, Carl Fredrik Løvlie, Reidar Jansen, Eystein Solheim, Anders Sejrup, Hans Petter Lie, Hans Erik 2003-09-15 32082 bytes 137 bytes 742994 bytes text/plain application/pdf https://hdl.handle.net/1956/380 https://doi.org/10.1016/s0031-0182(03)00402-4 eng eng Elsevier urn:issn:0031-0182 (print ISSN) https://hdl.handle.net/1956/380 https://doi.org/10.1016/s0031-0182(03)00402-4 Copyright 2003 Elsevier B.V. Antarctic Weddell Sea Dronning Maud Land Palaeoceanography Stable isotopes Magnetostratigraphy Peer reviewed Journal article 2003 ftunivbergen https://doi.org/10.1016/s0031-0182(03)00402-4 2023-03-14T17:42:05Z A 12.5 m long core was retrieved from the continental margin off Dronning Maud Land, Antarctica. Magnetostratigraphy, stable isotopes, 14C accelerator mass spectrometer and amino acid analyses indicate a continuous sediment record going back 1.3 Myr. Comparison of CaCO3 results with those from ODP Site 1089 and an index of North Atlantic Deep Water (NADW) influence in surface waters indicate that NADW upwelled along the Antarctic continental margin during the whole of this period. The mid-Pleistocene transition (1.0^0.6 Ma) was accompanied by an apparent decline in the NADW influence, and was followed by extended carbonate dissolution during the interglacials of marine isotope stages (MIS) 13 and 11. Less extensive periods of dissolution occur at the end of the interglacials younger than MIS 11. While interglacial dissolution is characteristic of the Pacific and Indian oceans, the carbon isotopes return to pre-transition values indicative of renewed NADW upwelling. The concentration of ice-rafted debris may reflect changes in the relative rate of interglacial sedimentation. It is speculated that the high ice rafted debris (IRD) concentrations during interglacials younger than 400 kyr may be due to a reduced relative sedimentation rate of other interglacial components whereas the low concentrations during interglacials before the mid-Pleistocene transition may be due to a higher relative sedimentation rate of these. < 2003 Elsevier B.V. All rights reserved. Article in Journal/Newspaper Antarc* Antarctic Antarctica Dronning Maud Land NADW North Atlantic Deep Water North Atlantic Weddell Sea University of Bergen: Bergen Open Research Archive (BORA-UiB) Antarctic Dronning Maud Land Indian Pacific The Antarctic Weddell Weddell Sea Palaeogeography, Palaeoclimatology, Palaeoecology 198 1-2 223 235 |
institution |
Open Polar |
collection |
University of Bergen: Bergen Open Research Archive (BORA-UiB) |
op_collection_id |
ftunivbergen |
language |
English |
topic |
Antarctic Weddell Sea Dronning Maud Land Palaeoceanography Stable isotopes Magnetostratigraphy |
spellingShingle |
Antarctic Weddell Sea Dronning Maud Land Palaeoceanography Stable isotopes Magnetostratigraphy Forsberg, Carl Fredrik Løvlie, Reidar Jansen, Eystein Solheim, Anders Sejrup, Hans Petter Lie, Hans Erik A 1.3-Myr palaeoceanographic record from the continental margin off Dronning Maud Land, Antarctica |
topic_facet |
Antarctic Weddell Sea Dronning Maud Land Palaeoceanography Stable isotopes Magnetostratigraphy |
description |
A 12.5 m long core was retrieved from the continental margin off Dronning Maud Land, Antarctica. Magnetostratigraphy, stable isotopes, 14C accelerator mass spectrometer and amino acid analyses indicate a continuous sediment record going back 1.3 Myr. Comparison of CaCO3 results with those from ODP Site 1089 and an index of North Atlantic Deep Water (NADW) influence in surface waters indicate that NADW upwelled along the Antarctic continental margin during the whole of this period. The mid-Pleistocene transition (1.0^0.6 Ma) was accompanied by an apparent decline in the NADW influence, and was followed by extended carbonate dissolution during the interglacials of marine isotope stages (MIS) 13 and 11. Less extensive periods of dissolution occur at the end of the interglacials younger than MIS 11. While interglacial dissolution is characteristic of the Pacific and Indian oceans, the carbon isotopes return to pre-transition values indicative of renewed NADW upwelling. The concentration of ice-rafted debris may reflect changes in the relative rate of interglacial sedimentation. It is speculated that the high ice rafted debris (IRD) concentrations during interglacials younger than 400 kyr may be due to a reduced relative sedimentation rate of other interglacial components whereas the low concentrations during interglacials before the mid-Pleistocene transition may be due to a higher relative sedimentation rate of these. < 2003 Elsevier B.V. All rights reserved. |
format |
Article in Journal/Newspaper |
author |
Forsberg, Carl Fredrik Løvlie, Reidar Jansen, Eystein Solheim, Anders Sejrup, Hans Petter Lie, Hans Erik |
author_facet |
Forsberg, Carl Fredrik Løvlie, Reidar Jansen, Eystein Solheim, Anders Sejrup, Hans Petter Lie, Hans Erik |
author_sort |
Forsberg, Carl Fredrik |
title |
A 1.3-Myr palaeoceanographic record from the continental margin off Dronning Maud Land, Antarctica |
title_short |
A 1.3-Myr palaeoceanographic record from the continental margin off Dronning Maud Land, Antarctica |
title_full |
A 1.3-Myr palaeoceanographic record from the continental margin off Dronning Maud Land, Antarctica |
title_fullStr |
A 1.3-Myr palaeoceanographic record from the continental margin off Dronning Maud Land, Antarctica |
title_full_unstemmed |
A 1.3-Myr palaeoceanographic record from the continental margin off Dronning Maud Land, Antarctica |
title_sort |
1.3-myr palaeoceanographic record from the continental margin off dronning maud land, antarctica |
publisher |
Elsevier |
publishDate |
2003 |
url |
https://hdl.handle.net/1956/380 https://doi.org/10.1016/s0031-0182(03)00402-4 |
geographic |
Antarctic Dronning Maud Land Indian Pacific The Antarctic Weddell Weddell Sea |
geographic_facet |
Antarctic Dronning Maud Land Indian Pacific The Antarctic Weddell Weddell Sea |
genre |
Antarc* Antarctic Antarctica Dronning Maud Land NADW North Atlantic Deep Water North Atlantic Weddell Sea |
genre_facet |
Antarc* Antarctic Antarctica Dronning Maud Land NADW North Atlantic Deep Water North Atlantic Weddell Sea |
op_relation |
urn:issn:0031-0182 (print ISSN) https://hdl.handle.net/1956/380 https://doi.org/10.1016/s0031-0182(03)00402-4 |
op_rights |
Copyright 2003 Elsevier B.V. |
op_doi |
https://doi.org/10.1016/s0031-0182(03)00402-4 |
container_title |
Palaeogeography, Palaeoclimatology, Palaeoecology |
container_volume |
198 |
container_issue |
1-2 |
container_start_page |
223 |
op_container_end_page |
235 |
_version_ |
1766282594294431744 |