North Atlantic Ice Sheet Fluctuations 10,000–70,000 Yr Ago as Inferred from Deposits on the Reykjanes Ridge, Southeast of Greenland
Marine records from the Reykjanes Ridge indicate ice sheet variations and abrupt climate changes. One of these records, ice-rafted detritus (IRD), serves as a proxy for iceberg discharges that probably indicates ice sheet fluctuations. The IRD records suggest that iceberg discharge 68,000–10,000 yr...
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Cambridge University Press (CUP)
1998
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crcambridgeupr:10.1006/qres.1997.1948 2024-06-09T07:46:27+00:00 North Atlantic Ice Sheet Fluctuations 10,000–70,000 Yr Ago as Inferred from Deposits on the Reykjanes Ridge, Southeast of Greenland Lackschewitz, Klas S. Baumann, Karl-Heinz Gehrke, Bettina Wallrabe-Adams, Hans-Joachim Thiede, Jörn Bonani, Georges Endler, Rudolf Erlenkeuser, Helmut Heinemeier, Jan 1998 http://dx.doi.org/10.1006/qres.1997.1948 http://api.elsevier.com/content/article/PII:S0033589497919487?httpAccept=text/xml http://api.elsevier.com/content/article/PII:S0033589497919487?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S003358940003893X en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Quaternary Research volume 49, issue 2, page 171-182 ISSN 0033-5894 1096-0287 journal-article 1998 crcambridgeupr https://doi.org/10.1006/qres.1997.1948 2024-05-15T13:16:46Z Marine records from the Reykjanes Ridge indicate ice sheet variations and abrupt climate changes. One of these records, ice-rafted detritus (IRD), serves as a proxy for iceberg discharges that probably indicates ice sheet fluctuations. The IRD records suggest that iceberg discharge 68,000–10,000 yr B.P. happened more frequently than the 7000- to 10,000-yr spacing of the Heinrich events. An IRD peak 67,000 to 63,000 yr B.P. further suggests that the Middle Weichselian glaciation started about 12,000 yr earlier in the North Atlantic than in the Norwegian Sea. Several later IRD events, in contrast, correlate with Norwegian Sea IRD-rich layers and imply coeval ice sheet advances in the North Atlantic and the Norwegian Sea. Coccoliths in a core from the Reykjanes Ridge show distinct peaks in species that record occasional inflow of warm surface water during the last glaciation, as previously reported from the eastern Labrador Sea. High abundances of coccoliths, together with a decrease of Neogloboquadrina pachyderma sin. and relatively low δ 18 O values, imply enhanced advection of the North Atlantic Current 69,000–67,000 yr B.P., 56,000–54,000 yr B.P., 35,000–33,000 yr B.P., and 26,000–23,000 yr B.P. This advection provided a regional moisture source for extension of ice sheets onto the shelf. In contrast, most of the IRD events are characterized by cold polar surface water masses indicating rapid variations in ocean surface conditions. Article in Journal/Newspaper Greenland Ice Sheet Labrador Sea Neogloboquadrina pachyderma north atlantic current North Atlantic Norwegian Sea Cambridge University Press Greenland Norwegian Sea Reykjanes ENVELOPE(-22.250,-22.250,65.467,65.467) Quaternary Research 49 2 171 182 |
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Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
description |
Marine records from the Reykjanes Ridge indicate ice sheet variations and abrupt climate changes. One of these records, ice-rafted detritus (IRD), serves as a proxy for iceberg discharges that probably indicates ice sheet fluctuations. The IRD records suggest that iceberg discharge 68,000–10,000 yr B.P. happened more frequently than the 7000- to 10,000-yr spacing of the Heinrich events. An IRD peak 67,000 to 63,000 yr B.P. further suggests that the Middle Weichselian glaciation started about 12,000 yr earlier in the North Atlantic than in the Norwegian Sea. Several later IRD events, in contrast, correlate with Norwegian Sea IRD-rich layers and imply coeval ice sheet advances in the North Atlantic and the Norwegian Sea. Coccoliths in a core from the Reykjanes Ridge show distinct peaks in species that record occasional inflow of warm surface water during the last glaciation, as previously reported from the eastern Labrador Sea. High abundances of coccoliths, together with a decrease of Neogloboquadrina pachyderma sin. and relatively low δ 18 O values, imply enhanced advection of the North Atlantic Current 69,000–67,000 yr B.P., 56,000–54,000 yr B.P., 35,000–33,000 yr B.P., and 26,000–23,000 yr B.P. This advection provided a regional moisture source for extension of ice sheets onto the shelf. In contrast, most of the IRD events are characterized by cold polar surface water masses indicating rapid variations in ocean surface conditions. |
format |
Article in Journal/Newspaper |
author |
Lackschewitz, Klas S. Baumann, Karl-Heinz Gehrke, Bettina Wallrabe-Adams, Hans-Joachim Thiede, Jörn Bonani, Georges Endler, Rudolf Erlenkeuser, Helmut Heinemeier, Jan |
spellingShingle |
Lackschewitz, Klas S. Baumann, Karl-Heinz Gehrke, Bettina Wallrabe-Adams, Hans-Joachim Thiede, Jörn Bonani, Georges Endler, Rudolf Erlenkeuser, Helmut Heinemeier, Jan North Atlantic Ice Sheet Fluctuations 10,000–70,000 Yr Ago as Inferred from Deposits on the Reykjanes Ridge, Southeast of Greenland |
author_facet |
Lackschewitz, Klas S. Baumann, Karl-Heinz Gehrke, Bettina Wallrabe-Adams, Hans-Joachim Thiede, Jörn Bonani, Georges Endler, Rudolf Erlenkeuser, Helmut Heinemeier, Jan |
author_sort |
Lackschewitz, Klas S. |
title |
North Atlantic Ice Sheet Fluctuations 10,000–70,000 Yr Ago as Inferred from Deposits on the Reykjanes Ridge, Southeast of Greenland |
title_short |
North Atlantic Ice Sheet Fluctuations 10,000–70,000 Yr Ago as Inferred from Deposits on the Reykjanes Ridge, Southeast of Greenland |
title_full |
North Atlantic Ice Sheet Fluctuations 10,000–70,000 Yr Ago as Inferred from Deposits on the Reykjanes Ridge, Southeast of Greenland |
title_fullStr |
North Atlantic Ice Sheet Fluctuations 10,000–70,000 Yr Ago as Inferred from Deposits on the Reykjanes Ridge, Southeast of Greenland |
title_full_unstemmed |
North Atlantic Ice Sheet Fluctuations 10,000–70,000 Yr Ago as Inferred from Deposits on the Reykjanes Ridge, Southeast of Greenland |
title_sort |
north atlantic ice sheet fluctuations 10,000–70,000 yr ago as inferred from deposits on the reykjanes ridge, southeast of greenland |
publisher |
Cambridge University Press (CUP) |
publishDate |
1998 |
url |
http://dx.doi.org/10.1006/qres.1997.1948 http://api.elsevier.com/content/article/PII:S0033589497919487?httpAccept=text/xml http://api.elsevier.com/content/article/PII:S0033589497919487?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S003358940003893X |
long_lat |
ENVELOPE(-22.250,-22.250,65.467,65.467) |
geographic |
Greenland Norwegian Sea Reykjanes |
geographic_facet |
Greenland Norwegian Sea Reykjanes |
genre |
Greenland Ice Sheet Labrador Sea Neogloboquadrina pachyderma north atlantic current North Atlantic Norwegian Sea |
genre_facet |
Greenland Ice Sheet Labrador Sea Neogloboquadrina pachyderma north atlantic current North Atlantic Norwegian Sea |
op_source |
Quaternary Research volume 49, issue 2, page 171-182 ISSN 0033-5894 1096-0287 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1006/qres.1997.1948 |
container_title |
Quaternary Research |
container_volume |
49 |
container_issue |
2 |
container_start_page |
171 |
op_container_end_page |
182 |
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1801376305048977408 |