Were glacial iceberg surges in the North Atlantic triggered by climatic warming?
High-resolution physical, mineralogical, sedimentological and micropalaeontological studies were carried out on North Atlantic cores from the Reykjanes Ridge at 59degreesN and from the region southwest of the Faeroe Islands. All core sites are situated along the pathway of Iceland-Scotland Overflow...
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Elsevier
2002
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Online Access: | https://lup.lub.lu.se/record/311969 https://doi.org/10.1016/S0025-3227(02)00592-3 |
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ftulundlup:oai:lup.lub.lu.se:67fae26e-8c60-424c-9425-d10e9aed8ecc 2023-05-15T13:48:54+02:00 Were glacial iceberg surges in the North Atlantic triggered by climatic warming? Moros, M Kuijpers, A Snowball, Ian Lassen, S Backstrom, D Gingele, F McManus, J 2002 https://lup.lub.lu.se/record/311969 https://doi.org/10.1016/S0025-3227(02)00592-3 eng eng Elsevier https://lup.lub.lu.se/record/311969 http://dx.doi.org/10.1016/S0025-3227(02)00592-3 wos:000182776200004 scopus:0347926488 Marine Geology; 192(4), pp 393-417 (2002) ISSN: 0025-3227 Geology ice-rafting Heinrich events North Atlantic magnetic susceptibility detritus palaeocurrents contributiontojournal/article info:eu-repo/semantics/article text 2002 ftulundlup https://doi.org/10.1016/S0025-3227(02)00592-3 2023-02-01T23:27:15Z High-resolution physical, mineralogical, sedimentological and micropalaeontological studies were carried out on North Atlantic cores from the Reykjanes Ridge at 59degreesN and from the region southwest of the Faeroe Islands. All core sites are situated along the pathway of Iceland-Scotland Overflow Water (ISOW) and the various parameters measured display similar features. Previously identified carbonate oscillations [Keigwin and Jones (1994) J. Geophys. Res., 99, 12397-12410] in the time span back to the Marine Isotope Stage 5-4 transition and Late Glacial lithic events [Bond and Lotti (1995) Science, 267, 1005-1010], such as the Heinrich ice-rafting events, are all represented in the core records. Long-term trends and higher-frequency changes in ISOW intensity were reconstructed on the basis of various independent proxy records. The long-term trends in circulation match theoretical orbitally forced insolation changes. Our observed links between ice-rafted detritus (IRD) input, variations in sea surface temperature (SST) and circulation at greater depth point to the need to re-examine the origin of IRD events. We suggest that these events may have been triggered by enhanced, partly sub-surface, heat transport to the-north. Enhanced northward heat transport may have caused bottom melting of floating outlet glaciers and ice shelves, leading to increased iceberg discharge and ice sheet destabilization. This discharge. resulted in lower SST's and a lower temperature over Greenland. Thus, as shown by our records, this scenario implies a temporary de-coupling of surface processes and circulation at greater depth. A key feature is the occurrence of a-saw-tooth pattern in the marine data, which is similar to the Greenland ice core records. Moreover, the 'warming' theory of IRD events would explain the observed 'out-of-phase' relationship between the Greenland and Antarctic ice-core records and also the rapid establishment of higher temperatures over Greenland immediately after the cold phases (stadials) of the ... Article in Journal/Newspaper Antarc* Antarctic Greenland Greenland ice core ice core Ice Sheet Ice Shelves Iceberg* Iceland North Atlantic Lund University Publications (LUP) Antarctic Greenland Reykjanes ENVELOPE(-22.250,-22.250,65.467,65.467) Marine Geology 192 4 393 417 |
institution |
Open Polar |
collection |
Lund University Publications (LUP) |
op_collection_id |
ftulundlup |
language |
English |
topic |
Geology ice-rafting Heinrich events North Atlantic magnetic susceptibility detritus palaeocurrents |
spellingShingle |
Geology ice-rafting Heinrich events North Atlantic magnetic susceptibility detritus palaeocurrents Moros, M Kuijpers, A Snowball, Ian Lassen, S Backstrom, D Gingele, F McManus, J Were glacial iceberg surges in the North Atlantic triggered by climatic warming? |
topic_facet |
Geology ice-rafting Heinrich events North Atlantic magnetic susceptibility detritus palaeocurrents |
description |
High-resolution physical, mineralogical, sedimentological and micropalaeontological studies were carried out on North Atlantic cores from the Reykjanes Ridge at 59degreesN and from the region southwest of the Faeroe Islands. All core sites are situated along the pathway of Iceland-Scotland Overflow Water (ISOW) and the various parameters measured display similar features. Previously identified carbonate oscillations [Keigwin and Jones (1994) J. Geophys. Res., 99, 12397-12410] in the time span back to the Marine Isotope Stage 5-4 transition and Late Glacial lithic events [Bond and Lotti (1995) Science, 267, 1005-1010], such as the Heinrich ice-rafting events, are all represented in the core records. Long-term trends and higher-frequency changes in ISOW intensity were reconstructed on the basis of various independent proxy records. The long-term trends in circulation match theoretical orbitally forced insolation changes. Our observed links between ice-rafted detritus (IRD) input, variations in sea surface temperature (SST) and circulation at greater depth point to the need to re-examine the origin of IRD events. We suggest that these events may have been triggered by enhanced, partly sub-surface, heat transport to the-north. Enhanced northward heat transport may have caused bottom melting of floating outlet glaciers and ice shelves, leading to increased iceberg discharge and ice sheet destabilization. This discharge. resulted in lower SST's and a lower temperature over Greenland. Thus, as shown by our records, this scenario implies a temporary de-coupling of surface processes and circulation at greater depth. A key feature is the occurrence of a-saw-tooth pattern in the marine data, which is similar to the Greenland ice core records. Moreover, the 'warming' theory of IRD events would explain the observed 'out-of-phase' relationship between the Greenland and Antarctic ice-core records and also the rapid establishment of higher temperatures over Greenland immediately after the cold phases (stadials) of the ... |
format |
Article in Journal/Newspaper |
author |
Moros, M Kuijpers, A Snowball, Ian Lassen, S Backstrom, D Gingele, F McManus, J |
author_facet |
Moros, M Kuijpers, A Snowball, Ian Lassen, S Backstrom, D Gingele, F McManus, J |
author_sort |
Moros, M |
title |
Were glacial iceberg surges in the North Atlantic triggered by climatic warming? |
title_short |
Were glacial iceberg surges in the North Atlantic triggered by climatic warming? |
title_full |
Were glacial iceberg surges in the North Atlantic triggered by climatic warming? |
title_fullStr |
Were glacial iceberg surges in the North Atlantic triggered by climatic warming? |
title_full_unstemmed |
Were glacial iceberg surges in the North Atlantic triggered by climatic warming? |
title_sort |
were glacial iceberg surges in the north atlantic triggered by climatic warming? |
publisher |
Elsevier |
publishDate |
2002 |
url |
https://lup.lub.lu.se/record/311969 https://doi.org/10.1016/S0025-3227(02)00592-3 |
long_lat |
ENVELOPE(-22.250,-22.250,65.467,65.467) |
geographic |
Antarctic Greenland Reykjanes |
geographic_facet |
Antarctic Greenland Reykjanes |
genre |
Antarc* Antarctic Greenland Greenland ice core ice core Ice Sheet Ice Shelves Iceberg* Iceland North Atlantic |
genre_facet |
Antarc* Antarctic Greenland Greenland ice core ice core Ice Sheet Ice Shelves Iceberg* Iceland North Atlantic |
op_source |
Marine Geology; 192(4), pp 393-417 (2002) ISSN: 0025-3227 |
op_relation |
https://lup.lub.lu.se/record/311969 http://dx.doi.org/10.1016/S0025-3227(02)00592-3 wos:000182776200004 scopus:0347926488 |
op_doi |
https://doi.org/10.1016/S0025-3227(02)00592-3 |
container_title |
Marine Geology |
container_volume |
192 |
container_issue |
4 |
container_start_page |
393 |
op_container_end_page |
417 |
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1766249938129256448 |