The δ 18 O record along the Greenland Ice Core Project deep ice core and the problem of possible Eemian climatic instability
International audience Over 70,000 samples from the 3029-m-long Greenland Ice Core Project (GRIP) ice core drilled on the top of the Greenland Ice Sheet (Summit) have been analyzed for •180. A highly detailed and continuous •80 profile has thus been obtained and is discussed in terms of past tempera...
Published in: | Journal of Geophysical Research: Oceans |
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Online Access: | https://hal.archives-ouvertes.fr/hal-03334995 https://hal.archives-ouvertes.fr/hal-03334995/document https://hal.archives-ouvertes.fr/hal-03334995/file/jgrC1997Johnsen26397.pdf https://doi.org/10.1029/97JC00167 |
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ftccsdartic:oai:HAL:hal-03334995v1 2023-05-15T16:26:36+02:00 The δ 18 O record along the Greenland Ice Core Project deep ice core and the problem of possible Eemian climatic instability Johnsen, Sigfús Clausen, Henrik, Dansgaard, Willi Gundestrup, Niels Hammer, Claus Andersen, Uffe Andersen, Katrine Hvidberg, Christine Dahl-Jensen, Dorthe Steffensen, Jørgen Shoji, Hitoshi Sveinbjörnsdóttir, Árny White, Jim Jouzel, Jean Fisher, David Johnsen, Sigffis Laboratoire de Modélisation du Climat et de l'Environnement (LMCE) 1997-11-30 https://hal.archives-ouvertes.fr/hal-03334995 https://hal.archives-ouvertes.fr/hal-03334995/document https://hal.archives-ouvertes.fr/hal-03334995/file/jgrC1997Johnsen26397.pdf https://doi.org/10.1029/97JC00167 en eng HAL CCSD Wiley-Blackwell info:eu-repo/semantics/altIdentifier/doi/10.1029/97JC00167 hal-03334995 https://hal.archives-ouvertes.fr/hal-03334995 https://hal.archives-ouvertes.fr/hal-03334995/document https://hal.archives-ouvertes.fr/hal-03334995/file/jgrC1997Johnsen26397.pdf doi:10.1029/97JC00167 info:eu-repo/semantics/OpenAccess ISSN: 2169-9275 EISSN: 2169-9291 Journal of Geophysical Research. Oceans https://hal.archives-ouvertes.fr/hal-03334995 Journal of Geophysical Research. Oceans, Wiley-Blackwell, 1997, 102 (C12), pp.26397-26410. ⟨10.1029/97JC00167⟩ [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment info:eu-repo/semantics/article Journal articles 1997 ftccsdartic https://doi.org/10.1029/97JC00167 2021-11-27T23:41:10Z International audience Over 70,000 samples from the 3029-m-long Greenland Ice Core Project (GRIP) ice core drilled on the top of the Greenland Ice Sheet (Summit) have been analyzed for •180. A highly detailed and continuous •80 profile has thus been obtained and is discussed in terms of past temperatures in Greenland. We also discuss a three-core stacked annual •80 profile for the past 917 years. The short-term (<50 years) variability of the annual •80 signal is found to be 1%o in the Holocene, and estimates for the coldest parts of the last glacial are 3%0 or higher. These data also provide insights into possible disturbances of the stratigraphic layering in the core which seems to be sound down to the onset of the Eemian. Spectral analysis of highly detailed sequences of the •8 profile helps determine the smoothing of the • O signal, which for the Holocene ice is found to be considerably stronger than expected. We suggest this is due to a process involving diffusion of water molecules along crystal boundaries in the recrystallizing ice matrix. Deconvolution techniques were employed for restoring with great confidence the •8 highly attenuated annual • O signal in the Holocene. We confirm earlier findings of dramatic temperature changes in Greenland during the last glacial cycle. Abrupt and strong climatic shifts are also found within the Eem/Sangamon Interglaciation, which is normally recorded as a period of warm and stable climate in lower latitudes. The stratigraphic continuity of the Eemian layers is consequently discussed in section 3 of this paper in terms of all pertinent data which we are not able to reconcile. Article in Journal/Newspaper Greenland Greenland ice core Greenland Ice core Project GRIP ice core Ice Sheet Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Greenland Journal of Geophysical Research: Oceans 102 C12 26397 26410 |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment Johnsen, Sigfús Clausen, Henrik, Dansgaard, Willi Gundestrup, Niels Hammer, Claus Andersen, Uffe Andersen, Katrine Hvidberg, Christine Dahl-Jensen, Dorthe Steffensen, Jørgen Shoji, Hitoshi Sveinbjörnsdóttir, Árny White, Jim Jouzel, Jean Fisher, David Johnsen, Sigffis The δ 18 O record along the Greenland Ice Core Project deep ice core and the problem of possible Eemian climatic instability |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment |
description |
International audience Over 70,000 samples from the 3029-m-long Greenland Ice Core Project (GRIP) ice core drilled on the top of the Greenland Ice Sheet (Summit) have been analyzed for •180. A highly detailed and continuous •80 profile has thus been obtained and is discussed in terms of past temperatures in Greenland. We also discuss a three-core stacked annual •80 profile for the past 917 years. The short-term (<50 years) variability of the annual •80 signal is found to be 1%o in the Holocene, and estimates for the coldest parts of the last glacial are 3%0 or higher. These data also provide insights into possible disturbances of the stratigraphic layering in the core which seems to be sound down to the onset of the Eemian. Spectral analysis of highly detailed sequences of the •8 profile helps determine the smoothing of the • O signal, which for the Holocene ice is found to be considerably stronger than expected. We suggest this is due to a process involving diffusion of water molecules along crystal boundaries in the recrystallizing ice matrix. Deconvolution techniques were employed for restoring with great confidence the •8 highly attenuated annual • O signal in the Holocene. We confirm earlier findings of dramatic temperature changes in Greenland during the last glacial cycle. Abrupt and strong climatic shifts are also found within the Eem/Sangamon Interglaciation, which is normally recorded as a period of warm and stable climate in lower latitudes. The stratigraphic continuity of the Eemian layers is consequently discussed in section 3 of this paper in terms of all pertinent data which we are not able to reconcile. |
author2 |
Laboratoire de Modélisation du Climat et de l'Environnement (LMCE) |
format |
Article in Journal/Newspaper |
author |
Johnsen, Sigfús Clausen, Henrik, Dansgaard, Willi Gundestrup, Niels Hammer, Claus Andersen, Uffe Andersen, Katrine Hvidberg, Christine Dahl-Jensen, Dorthe Steffensen, Jørgen Shoji, Hitoshi Sveinbjörnsdóttir, Árny White, Jim Jouzel, Jean Fisher, David Johnsen, Sigffis |
author_facet |
Johnsen, Sigfús Clausen, Henrik, Dansgaard, Willi Gundestrup, Niels Hammer, Claus Andersen, Uffe Andersen, Katrine Hvidberg, Christine Dahl-Jensen, Dorthe Steffensen, Jørgen Shoji, Hitoshi Sveinbjörnsdóttir, Árny White, Jim Jouzel, Jean Fisher, David Johnsen, Sigffis |
author_sort |
Johnsen, Sigfús |
title |
The δ 18 O record along the Greenland Ice Core Project deep ice core and the problem of possible Eemian climatic instability |
title_short |
The δ 18 O record along the Greenland Ice Core Project deep ice core and the problem of possible Eemian climatic instability |
title_full |
The δ 18 O record along the Greenland Ice Core Project deep ice core and the problem of possible Eemian climatic instability |
title_fullStr |
The δ 18 O record along the Greenland Ice Core Project deep ice core and the problem of possible Eemian climatic instability |
title_full_unstemmed |
The δ 18 O record along the Greenland Ice Core Project deep ice core and the problem of possible Eemian climatic instability |
title_sort |
δ 18 o record along the greenland ice core project deep ice core and the problem of possible eemian climatic instability |
publisher |
HAL CCSD |
publishDate |
1997 |
url |
https://hal.archives-ouvertes.fr/hal-03334995 https://hal.archives-ouvertes.fr/hal-03334995/document https://hal.archives-ouvertes.fr/hal-03334995/file/jgrC1997Johnsen26397.pdf https://doi.org/10.1029/97JC00167 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Greenland ice core Greenland Ice core Project GRIP ice core Ice Sheet |
genre_facet |
Greenland Greenland ice core Greenland Ice core Project GRIP ice core Ice Sheet |
op_source |
ISSN: 2169-9275 EISSN: 2169-9291 Journal of Geophysical Research. Oceans https://hal.archives-ouvertes.fr/hal-03334995 Journal of Geophysical Research. Oceans, Wiley-Blackwell, 1997, 102 (C12), pp.26397-26410. ⟨10.1029/97JC00167⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/97JC00167 hal-03334995 https://hal.archives-ouvertes.fr/hal-03334995 https://hal.archives-ouvertes.fr/hal-03334995/document https://hal.archives-ouvertes.fr/hal-03334995/file/jgrC1997Johnsen26397.pdf doi:10.1029/97JC00167 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/97JC00167 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
102 |
container_issue |
C12 |
container_start_page |
26397 |
op_container_end_page |
26410 |
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1766015540837482496 |