Where to find 1.5 million yr old ice for the IPICS "Oldest-Ice" ice core
The recovery of a 1.5 million yr long ice core from Antarctica represents a keystone of our understanding of Quaternary climate, the progression of glaciation over this time period and the role of greenhouse gas cycles in this progression. Here we tackle the question of where such ice may still be f...
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ftunivbruxelles:oai:dipot.ulb.ac.be:2013/197827 2023-05-15T13:37:29+02:00 Where to find 1.5 million yr old ice for the IPICS "Oldest-Ice" ice core Fischer, Hubertus Schwander, Jakob Severinghaus, Jeffrey Brook, Edward Wolff, Eric Arthern, Robert Dinn, Michael Hindmarsh, Richard Mulvaney, Robert Albert, Mary Alemany, Olivier Chappellaz, Jérôme Gallee, Hubert Parrenin, Frédéric Ritz, Catherine Bentley, Charles Blankenship, Donald Creyts, Timothy Dahl-Jensen, Dorthe Frezzotti, Massimo Fujita, S. Kawamura, Kenji Hudspeth, Don Van Ommen, Tas Jugie, Gerard Lipenkov, Vladimir Ya Miller, Heinz Steinhage, Daniel Wilhelms, Frank Pattyn, Frank 2013-11 1 full-text file(s): application/pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/197827 https://dipot.ulb.ac.be/dspace/bitstream/2013/197827/3/doi_181454.pdf en eng uri/info:doi/10.5194/cp-9-2489-2013 uri/info:scp/84894047680 https://dipot.ulb.ac.be/dspace/bitstream/2013/197827/3/doi_181454.pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/197827 1 full-text file(s): info:eu-repo/semantics/openAccess Climate of the past, 9 (6 Stratigraphie Environnement et pollution Paléontologie et paléoécologie info:eu-repo/semantics/article info:ulb-repo/semantics/articlePeerReview info:ulb-repo/semantics/openurl/article 2013 ftunivbruxelles 2022-06-12T22:09:17Z The recovery of a 1.5 million yr long ice core from Antarctica represents a keystone of our understanding of Quaternary climate, the progression of glaciation over this time period and the role of greenhouse gas cycles in this progression. Here we tackle the question of where such ice may still be found in the Antarctic ice sheet. We can show that such old ice is most likely to exist in the plateau area of the East Antarctic ice sheet (EAIS) without stratigraphic disturbance and should be able to be recovered after careful presite selection studies. Based on a simple ice and heat flow model and glaciological observations, we conclude that positions in the vicinity of major domes and saddle position on the East Antarctic Plateau will most likely have such old ice in store and represent the best study areas for dedicated reconnaissance studies in the near future. In contrast to previous ice core drill site selections, however, we strongly suggest significantly reduced ice thickness to avoid bottom melting. For example for the geothermal heat flux and accumulation conditions at Dome C, an ice thickness lower than but close to about 2500 m would be required to find 1.5 Myr old ice (i.e. more than 700 m less than at the current EPICA Dome C drill site). Within this constraint, the resolution of an Oldest-Ice record and the distance of such old ice to the bedrock should be maximized to avoid ice flow disturbances, for example, by finding locations with minimum geothermal heat flux. As the geothermal heat flux is largely unknown for the EAIS, this parameter has to be carefully determined beforehand. In addition, detailed bedrock topography and ice flow history has to be reconstructed for candidates of an Oldest-Ice ice coring site. Finally, we argue strongly for rapid access drilling before any full, deep ice coring activity commences to bring datable samples to the surface and to allow an age check of the oldest ice. SCOPUS: ar.j info:eu-repo/semantics/published Article in Journal/Newspaper Antarc* Antarctic Antarctica EPICA ice core Ice Sheet DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB) Antarctic The Antarctic East Antarctic Ice Sheet |
institution |
Open Polar |
collection |
DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB) |
op_collection_id |
ftunivbruxelles |
language |
English |
topic |
Stratigraphie Environnement et pollution Paléontologie et paléoécologie |
spellingShingle |
Stratigraphie Environnement et pollution Paléontologie et paléoécologie Fischer, Hubertus Schwander, Jakob Severinghaus, Jeffrey Brook, Edward Wolff, Eric Arthern, Robert Dinn, Michael Hindmarsh, Richard Mulvaney, Robert Albert, Mary Alemany, Olivier Chappellaz, Jérôme Gallee, Hubert Parrenin, Frédéric Ritz, Catherine Bentley, Charles Blankenship, Donald Creyts, Timothy Dahl-Jensen, Dorthe Frezzotti, Massimo Fujita, S. Kawamura, Kenji Hudspeth, Don Van Ommen, Tas Jugie, Gerard Lipenkov, Vladimir Ya Miller, Heinz Steinhage, Daniel Wilhelms, Frank Pattyn, Frank Where to find 1.5 million yr old ice for the IPICS "Oldest-Ice" ice core |
topic_facet |
Stratigraphie Environnement et pollution Paléontologie et paléoécologie |
description |
The recovery of a 1.5 million yr long ice core from Antarctica represents a keystone of our understanding of Quaternary climate, the progression of glaciation over this time period and the role of greenhouse gas cycles in this progression. Here we tackle the question of where such ice may still be found in the Antarctic ice sheet. We can show that such old ice is most likely to exist in the plateau area of the East Antarctic ice sheet (EAIS) without stratigraphic disturbance and should be able to be recovered after careful presite selection studies. Based on a simple ice and heat flow model and glaciological observations, we conclude that positions in the vicinity of major domes and saddle position on the East Antarctic Plateau will most likely have such old ice in store and represent the best study areas for dedicated reconnaissance studies in the near future. In contrast to previous ice core drill site selections, however, we strongly suggest significantly reduced ice thickness to avoid bottom melting. For example for the geothermal heat flux and accumulation conditions at Dome C, an ice thickness lower than but close to about 2500 m would be required to find 1.5 Myr old ice (i.e. more than 700 m less than at the current EPICA Dome C drill site). Within this constraint, the resolution of an Oldest-Ice record and the distance of such old ice to the bedrock should be maximized to avoid ice flow disturbances, for example, by finding locations with minimum geothermal heat flux. As the geothermal heat flux is largely unknown for the EAIS, this parameter has to be carefully determined beforehand. In addition, detailed bedrock topography and ice flow history has to be reconstructed for candidates of an Oldest-Ice ice coring site. Finally, we argue strongly for rapid access drilling before any full, deep ice coring activity commences to bring datable samples to the surface and to allow an age check of the oldest ice. SCOPUS: ar.j info:eu-repo/semantics/published |
format |
Article in Journal/Newspaper |
author |
Fischer, Hubertus Schwander, Jakob Severinghaus, Jeffrey Brook, Edward Wolff, Eric Arthern, Robert Dinn, Michael Hindmarsh, Richard Mulvaney, Robert Albert, Mary Alemany, Olivier Chappellaz, Jérôme Gallee, Hubert Parrenin, Frédéric Ritz, Catherine Bentley, Charles Blankenship, Donald Creyts, Timothy Dahl-Jensen, Dorthe Frezzotti, Massimo Fujita, S. Kawamura, Kenji Hudspeth, Don Van Ommen, Tas Jugie, Gerard Lipenkov, Vladimir Ya Miller, Heinz Steinhage, Daniel Wilhelms, Frank Pattyn, Frank |
author_facet |
Fischer, Hubertus Schwander, Jakob Severinghaus, Jeffrey Brook, Edward Wolff, Eric Arthern, Robert Dinn, Michael Hindmarsh, Richard Mulvaney, Robert Albert, Mary Alemany, Olivier Chappellaz, Jérôme Gallee, Hubert Parrenin, Frédéric Ritz, Catherine Bentley, Charles Blankenship, Donald Creyts, Timothy Dahl-Jensen, Dorthe Frezzotti, Massimo Fujita, S. Kawamura, Kenji Hudspeth, Don Van Ommen, Tas Jugie, Gerard Lipenkov, Vladimir Ya Miller, Heinz Steinhage, Daniel Wilhelms, Frank Pattyn, Frank |
author_sort |
Fischer, Hubertus |
title |
Where to find 1.5 million yr old ice for the IPICS "Oldest-Ice" ice core |
title_short |
Where to find 1.5 million yr old ice for the IPICS "Oldest-Ice" ice core |
title_full |
Where to find 1.5 million yr old ice for the IPICS "Oldest-Ice" ice core |
title_fullStr |
Where to find 1.5 million yr old ice for the IPICS "Oldest-Ice" ice core |
title_full_unstemmed |
Where to find 1.5 million yr old ice for the IPICS "Oldest-Ice" ice core |
title_sort |
where to find 1.5 million yr old ice for the ipics "oldest-ice" ice core |
publishDate |
2013 |
url |
http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/197827 https://dipot.ulb.ac.be/dspace/bitstream/2013/197827/3/doi_181454.pdf |
geographic |
Antarctic The Antarctic East Antarctic Ice Sheet |
geographic_facet |
Antarctic The Antarctic East Antarctic Ice Sheet |
genre |
Antarc* Antarctic Antarctica EPICA ice core Ice Sheet |
genre_facet |
Antarc* Antarctic Antarctica EPICA ice core Ice Sheet |
op_source |
Climate of the past, 9 (6 |
op_relation |
uri/info:doi/10.5194/cp-9-2489-2013 uri/info:scp/84894047680 https://dipot.ulb.ac.be/dspace/bitstream/2013/197827/3/doi_181454.pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/197827 |
op_rights |
1 full-text file(s): info:eu-repo/semantics/openAccess |
_version_ |
1766092537070616576 |