Irregular glacial interstadials recorded in a new greenland ice core
The Greenland ice sheet offers the most favourable conditions in the Northern Hemisphere for obtaining high-resolution continuous time series of climate-related parameters. Profiles of 18O/<16O ratio along three previous deep Greenland ice cores1–3 seemed to reveal irregular but well-defined epis...
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Macmillan Journals Ltd.
1992
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Online Access: | https://boris.unibe.ch/158240/1/johnsen92nat.pdf https://boris.unibe.ch/158240/ |
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ftunivbern:oai:boris.unibe.ch:158240 2023-08-20T04:06:49+02:00 Irregular glacial interstadials recorded in a new greenland ice core Johnsen, S. Clausen, W. Dansgaard, W. Fuhrer, K. Gundestrup, N. Hammer, C. Iversen, P. Jouzel, J. Stauffer, B. Steffensen, J. 1992 application/pdf https://boris.unibe.ch/158240/1/johnsen92nat.pdf https://boris.unibe.ch/158240/ eng eng Macmillan Journals Ltd. https://boris.unibe.ch/158240/ info:eu-repo/semantics/restrictedAccess Johnsen, S.; Clausen, W.; Dansgaard, W.; Fuhrer, K.; Gundestrup, N.; Hammer, C.; Iversen, P.; Jouzel, J.; Stauffer, B.; Steffensen, J. (1992). Irregular glacial interstadials recorded in a new greenland ice core. Nature, 359(6393), pp. 311-313. Macmillan Journals Ltd. 10.1038/359311a0 <http://dx.doi.org/10.1038/359311a0> 530 Physics info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion PeerReviewed 1992 ftunivbern https://doi.org/10.1038/359311a0 2023-07-31T22:08:01Z The Greenland ice sheet offers the most favourable conditions in the Northern Hemisphere for obtaining high-resolution continuous time series of climate-related parameters. Profiles of 18O/<16O ratio along three previous deep Greenland ice cores1–3 seemed to reveal irregular but well-defined episodes of relatively mild climate conditions (interstadials) during the mid and late parts of the last glaciation, but there has been some doubt as to whether the shifts in oxygen isotope ratio were genuine representations of changes in climate, rather than artefacts due to disturbed stratification. Here we present results from a new deep ice core drilled at the summit of the Greenland ice sheet, where the depositional environ-ment and the flow pattern of the ice are close to ideal for core recovery and analysis. The results reproduce the previous findings to such a degree that the existence of the interstadial episodes can no longer be in doubt. According to a preliminary timescale based on stratigraphic studies, the interstadials lasted from 500 to 2,000 years, and their irregular occurrence suggests complexity in the behaviour of the North Atlantic ocean circulation. Article in Journal/Newspaper Greenland Greenland ice core ice core Ice Sheet North Atlantic BORIS (Bern Open Repository and Information System, University of Bern) Greenland Nature 359 6393 311 313 |
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Open Polar |
collection |
BORIS (Bern Open Repository and Information System, University of Bern) |
op_collection_id |
ftunivbern |
language |
English |
topic |
530 Physics |
spellingShingle |
530 Physics Johnsen, S. Clausen, W. Dansgaard, W. Fuhrer, K. Gundestrup, N. Hammer, C. Iversen, P. Jouzel, J. Stauffer, B. Steffensen, J. Irregular glacial interstadials recorded in a new greenland ice core |
topic_facet |
530 Physics |
description |
The Greenland ice sheet offers the most favourable conditions in the Northern Hemisphere for obtaining high-resolution continuous time series of climate-related parameters. Profiles of 18O/<16O ratio along three previous deep Greenland ice cores1–3 seemed to reveal irregular but well-defined episodes of relatively mild climate conditions (interstadials) during the mid and late parts of the last glaciation, but there has been some doubt as to whether the shifts in oxygen isotope ratio were genuine representations of changes in climate, rather than artefacts due to disturbed stratification. Here we present results from a new deep ice core drilled at the summit of the Greenland ice sheet, where the depositional environ-ment and the flow pattern of the ice are close to ideal for core recovery and analysis. The results reproduce the previous findings to such a degree that the existence of the interstadial episodes can no longer be in doubt. According to a preliminary timescale based on stratigraphic studies, the interstadials lasted from 500 to 2,000 years, and their irregular occurrence suggests complexity in the behaviour of the North Atlantic ocean circulation. |
format |
Article in Journal/Newspaper |
author |
Johnsen, S. Clausen, W. Dansgaard, W. Fuhrer, K. Gundestrup, N. Hammer, C. Iversen, P. Jouzel, J. Stauffer, B. Steffensen, J. |
author_facet |
Johnsen, S. Clausen, W. Dansgaard, W. Fuhrer, K. Gundestrup, N. Hammer, C. Iversen, P. Jouzel, J. Stauffer, B. Steffensen, J. |
author_sort |
Johnsen, S. |
title |
Irregular glacial interstadials recorded in a new greenland ice core |
title_short |
Irregular glacial interstadials recorded in a new greenland ice core |
title_full |
Irregular glacial interstadials recorded in a new greenland ice core |
title_fullStr |
Irregular glacial interstadials recorded in a new greenland ice core |
title_full_unstemmed |
Irregular glacial interstadials recorded in a new greenland ice core |
title_sort |
irregular glacial interstadials recorded in a new greenland ice core |
publisher |
Macmillan Journals Ltd. |
publishDate |
1992 |
url |
https://boris.unibe.ch/158240/1/johnsen92nat.pdf https://boris.unibe.ch/158240/ |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Greenland ice core ice core Ice Sheet North Atlantic |
genre_facet |
Greenland Greenland ice core ice core Ice Sheet North Atlantic |
op_source |
Johnsen, S.; Clausen, W.; Dansgaard, W.; Fuhrer, K.; Gundestrup, N.; Hammer, C.; Iversen, P.; Jouzel, J.; Stauffer, B.; Steffensen, J. (1992). Irregular glacial interstadials recorded in a new greenland ice core. Nature, 359(6393), pp. 311-313. Macmillan Journals Ltd. 10.1038/359311a0 <http://dx.doi.org/10.1038/359311a0> |
op_relation |
https://boris.unibe.ch/158240/ |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1038/359311a0 |
container_title |
Nature |
container_volume |
359 |
container_issue |
6393 |
container_start_page |
311 |
op_container_end_page |
313 |
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1774718141081845760 |