The role of an Arctic ice shelf in the climate of the MIS 6 glacial maximum (140 ka)
International audience During the last decade, Arctic icebreaker and nuclear submarine expeditions have revealed large-scale Pleistocene glacial erosion on the Lomonosov Ridge, Chukchi Borderland and along the Northern Alaskan margin indicating that the glacial Arctic Ocean hosted large Antarctic-st...
Published in: | Quaternary Science Reviews |
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Main Authors: | , , |
Other Authors: | , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2010
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Online Access: | https://insu.hal.science/insu-00652954 https://doi.org/10.1016/j.quascirev.2010.06.023 |
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ftunigrenoble:oai:HAL:insu-00652954v1 |
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Université Grenoble Alpes: HAL |
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ftunigrenoble |
language |
English |
topic |
[SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology |
spellingShingle |
[SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology Colleoni, F. Krinner, G. Jakobsson, M. The role of an Arctic ice shelf in the climate of the MIS 6 glacial maximum (140 ka) |
topic_facet |
[SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology |
description |
International audience During the last decade, Arctic icebreaker and nuclear submarine expeditions have revealed large-scale Pleistocene glacial erosion on the Lomonosov Ridge, Chukchi Borderland and along the Northern Alaskan margin indicating that the glacial Arctic Ocean hosted large Antarctic-style ice shelves. Dating of sediment cores indicates that the most extensive and deepest ice grounding occurred during Marine Isotope Stage (MIS) 6. The precise extents of Pleistocene ice shelves in the Arctic Ocean are unknown but seem comparable to present existing Antarctic ice shelves. How would an Antarctic-style ice shelf in the MIS 6 Arctic Ocean influence the Northern Hemisphere climate? Could it have impacted on the surface mass balance (SMB) of the MIS 6 Eurasian ice sheet and contributed to its large southward extent? We use an Atmospheric General Circulation Model (AGCM) to investigate the climatic impacts of both a limited MIS 6 ice shelf covering portions of the Canada Basin and a fully ice shelf covered Arctic Ocean. The AGCM results show that both ice shelves cause a temperature cooling of about 3 °C over the Arctic Ocean mainly due to the combined effect of ice elevation and isolation from the underlying ocean heat fluxes stopping the snow cover from melting during summer. The calculated SMB of the ice shelves are positive. The ice front horizontal velocity of the Canada Basin ice shelf is estimated to ≈ 1 km yr−1 which is comparable to the recent measurements of the Ross ice shelf, Antarctica. The existence of a large continuous ice shelf covering the entire Arctic Ocean would imply a mean annual velocity of icebergs of ≈12 km yr−1 through the Fram Strait. Our modeling results show that both ice shelf configurations could be viable under the MIS 6 climatic conditions. However, the cooling caused by these ice shelves only affects the Arctic margins of the continental ice sheets and is not strong enough to significantly influence the surface mass balance of the entire MIS 6 Eurasian ice sheet. |
author2 |
Laboratoire de glaciologie et géophysique de l'environnement (LGGE) Observatoire des Sciences de l'Univers de Grenoble (OSUG) Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) Department of Geological Sciences Stockholm Stockholm University CLIPS Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Observatoire des Sciences de l'Univers de Grenoble (OSUG) ANR-05-BLAN-0310,IDEGLACE,Impact de Décharges d'Eau douce provenant de la GLace continentale sur le Climat Européen et méditerranéen(2005) |
format |
Article in Journal/Newspaper |
author |
Colleoni, F. Krinner, G. Jakobsson, M. |
author_facet |
Colleoni, F. Krinner, G. Jakobsson, M. |
author_sort |
Colleoni, F. |
title |
The role of an Arctic ice shelf in the climate of the MIS 6 glacial maximum (140 ka) |
title_short |
The role of an Arctic ice shelf in the climate of the MIS 6 glacial maximum (140 ka) |
title_full |
The role of an Arctic ice shelf in the climate of the MIS 6 glacial maximum (140 ka) |
title_fullStr |
The role of an Arctic ice shelf in the climate of the MIS 6 glacial maximum (140 ka) |
title_full_unstemmed |
The role of an Arctic ice shelf in the climate of the MIS 6 glacial maximum (140 ka) |
title_sort |
role of an arctic ice shelf in the climate of the mis 6 glacial maximum (140 ka) |
publisher |
HAL CCSD |
publishDate |
2010 |
url |
https://insu.hal.science/insu-00652954 https://doi.org/10.1016/j.quascirev.2010.06.023 |
long_lat |
ENVELOPE(-165.000,-165.000,77.000,77.000) |
geographic |
Antarctic Arctic Arctic Ocean Canada Chukchi Borderland Ross Ice Shelf |
geographic_facet |
Antarctic Arctic Arctic Ocean Canada Chukchi Borderland Ross Ice Shelf |
genre |
Antarc* Antarctic Antarctica Arctic Arctic Ocean canada basin Chukchi Fram Strait Ice Sheet Ice Shelf Ice Shelves Iceberg* Iceberg* Lomonosov Ridge Ross Ice Shelf |
genre_facet |
Antarc* Antarctic Antarctica Arctic Arctic Ocean canada basin Chukchi Fram Strait Ice Sheet Ice Shelf Ice Shelves Iceberg* Iceberg* Lomonosov Ridge Ross Ice Shelf |
op_source |
ISSN: 0277-3791 EISSN: 1873-457X Quaternary Science Reviews https://insu.hal.science/insu-00652954 Quaternary Science Reviews, 2010, 29 (25-26), pp.3590-3597. ⟨10.1016/j.quascirev.2010.06.023⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.quascirev.2010.06.023 insu-00652954 https://insu.hal.science/insu-00652954 doi:10.1016/j.quascirev.2010.06.023 |
op_doi |
https://doi.org/10.1016/j.quascirev.2010.06.023 |
container_title |
Quaternary Science Reviews |
container_volume |
29 |
container_issue |
25-26 |
container_start_page |
3590 |
op_container_end_page |
3597 |
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1798846106097942528 |
spelling |
ftunigrenoble:oai:HAL:insu-00652954v1 2024-05-12T07:54:00+00:00 The role of an Arctic ice shelf in the climate of the MIS 6 glacial maximum (140 ka) Colleoni, F. Krinner, G. Jakobsson, M. Laboratoire de glaciologie et géophysique de l'environnement (LGGE) Observatoire des Sciences de l'Univers de Grenoble (OSUG) Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) Department of Geological Sciences Stockholm Stockholm University CLIPS Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Observatoire des Sciences de l'Univers de Grenoble (OSUG) ANR-05-BLAN-0310,IDEGLACE,Impact de Décharges d'Eau douce provenant de la GLace continentale sur le Climat Européen et méditerranéen(2005) 2010-12 https://insu.hal.science/insu-00652954 https://doi.org/10.1016/j.quascirev.2010.06.023 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.quascirev.2010.06.023 insu-00652954 https://insu.hal.science/insu-00652954 doi:10.1016/j.quascirev.2010.06.023 ISSN: 0277-3791 EISSN: 1873-457X Quaternary Science Reviews https://insu.hal.science/insu-00652954 Quaternary Science Reviews, 2010, 29 (25-26), pp.3590-3597. ⟨10.1016/j.quascirev.2010.06.023⟩ [SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology info:eu-repo/semantics/article Journal articles 2010 ftunigrenoble https://doi.org/10.1016/j.quascirev.2010.06.023 2024-04-18T02:25:25Z International audience During the last decade, Arctic icebreaker and nuclear submarine expeditions have revealed large-scale Pleistocene glacial erosion on the Lomonosov Ridge, Chukchi Borderland and along the Northern Alaskan margin indicating that the glacial Arctic Ocean hosted large Antarctic-style ice shelves. Dating of sediment cores indicates that the most extensive and deepest ice grounding occurred during Marine Isotope Stage (MIS) 6. The precise extents of Pleistocene ice shelves in the Arctic Ocean are unknown but seem comparable to present existing Antarctic ice shelves. How would an Antarctic-style ice shelf in the MIS 6 Arctic Ocean influence the Northern Hemisphere climate? Could it have impacted on the surface mass balance (SMB) of the MIS 6 Eurasian ice sheet and contributed to its large southward extent? We use an Atmospheric General Circulation Model (AGCM) to investigate the climatic impacts of both a limited MIS 6 ice shelf covering portions of the Canada Basin and a fully ice shelf covered Arctic Ocean. The AGCM results show that both ice shelves cause a temperature cooling of about 3 °C over the Arctic Ocean mainly due to the combined effect of ice elevation and isolation from the underlying ocean heat fluxes stopping the snow cover from melting during summer. The calculated SMB of the ice shelves are positive. The ice front horizontal velocity of the Canada Basin ice shelf is estimated to ≈ 1 km yr−1 which is comparable to the recent measurements of the Ross ice shelf, Antarctica. The existence of a large continuous ice shelf covering the entire Arctic Ocean would imply a mean annual velocity of icebergs of ≈12 km yr−1 through the Fram Strait. Our modeling results show that both ice shelf configurations could be viable under the MIS 6 climatic conditions. However, the cooling caused by these ice shelves only affects the Arctic margins of the continental ice sheets and is not strong enough to significantly influence the surface mass balance of the entire MIS 6 Eurasian ice sheet. Article in Journal/Newspaper Antarc* Antarctic Antarctica Arctic Arctic Ocean canada basin Chukchi Fram Strait Ice Sheet Ice Shelf Ice Shelves Iceberg* Iceberg* Lomonosov Ridge Ross Ice Shelf Université Grenoble Alpes: HAL Antarctic Arctic Arctic Ocean Canada Chukchi Borderland ENVELOPE(-165.000,-165.000,77.000,77.000) Ross Ice Shelf Quaternary Science Reviews 29 25-26 3590 3597 |