Links between ocean temperature and iceberg discharge during Heinrich events
International audience Palaeoclimate records have revealed the presence of millennial-scale climate oscillations throughout the last glacial period1. Six periods of extreme cooling in the Northern Hemisphere--known as Heinrich events--were marked by an enhanced discharge of icebergs into the North A...
Published in: | Nature Geoscience |
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Main Authors: | , , , , , |
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Format: | Article in Journal/Newspaper |
Language: | English |
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Online Access: | https://insu.hal.science/insu-00652843 https://doi.org/10.1038/ngeo752 |
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[SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology |
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[SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology Alvarez-Solas, J. Charbit, S. Ritz, C. Paillard, D. Ramstein, G. Dumas, C. Links between ocean temperature and iceberg discharge during Heinrich events |
topic_facet |
[SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology |
description |
International audience Palaeoclimate records have revealed the presence of millennial-scale climate oscillations throughout the last glacial period1. Six periods of extreme cooling in the Northern Hemisphere--known as Heinrich events--were marked by an enhanced discharge of icebergs into the North Atlantic Ocean2, 3, increasing the deposition of ice-rafted debris2. Increased sliding at the base of ice sheets as a result of basal warming has been proposed to explain the iceberg pulses4, 5, 6, but recent observations7, 8 suggest that iceberg discharge is related to a strong coupling between ice sheets, ice shelves and ocean conditions. Here we use a conceptual numerical model to simulate the effect of ocean temperature on ice-shelf width, as well as the impact of the resultant changes in ice-shelf geometry on ice-stream velocities. Our results demonstrate that ocean temperature oscillations affect the basal melting of the ice shelf and will generate periodic pulses of iceberg discharge in an ice sheet with a fringing shelf. We also find that the irregular occurrence of Heinrich events seen in the palaeoclimate records can be simulated by periodic ocean forcing combined with varying accumulation rates of the ice sheet. Our model simulations support a link between millennial-scale ocean temperature variability and Heinrich events during the last glacial period. |
author2 |
Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA) Modélisation du climat (CLIM) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) EDGe 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)-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) ANR-05-BLAN-0310,IDEGLACE,Impact de Décharges d'Eau douce provenant de la GLace continentale sur le Climat Européen et méditerranéen(2005) European Project: 36305,NICE |
format |
Article in Journal/Newspaper |
author |
Alvarez-Solas, J. Charbit, S. Ritz, C. Paillard, D. Ramstein, G. Dumas, C. |
author_facet |
Alvarez-Solas, J. Charbit, S. Ritz, C. Paillard, D. Ramstein, G. Dumas, C. |
author_sort |
Alvarez-Solas, J. |
title |
Links between ocean temperature and iceberg discharge during Heinrich events |
title_short |
Links between ocean temperature and iceberg discharge during Heinrich events |
title_full |
Links between ocean temperature and iceberg discharge during Heinrich events |
title_fullStr |
Links between ocean temperature and iceberg discharge during Heinrich events |
title_full_unstemmed |
Links between ocean temperature and iceberg discharge during Heinrich events |
title_sort |
links between ocean temperature and iceberg discharge during heinrich events |
publisher |
HAL CCSD |
publishDate |
2010 |
url |
https://insu.hal.science/insu-00652843 https://doi.org/10.1038/ngeo752 |
genre |
Ice Sheet Ice Shelf Ice Shelves North Atlantic |
genre_facet |
Ice Sheet Ice Shelf Ice Shelves North Atlantic |
op_source |
ISSN: 1752-0894 Nature Geoscience https://insu.hal.science/insu-00652843 Nature Geoscience, 2010, 3 (2), pp.122 - 126. ⟨10.1038/ngeo752⟩ |
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https://doi.org/10.1038/ngeo752 |
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Nature Geoscience |
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ftanrparis:oai:HAL:insu-00652843v1 2024-06-09T07:46:48+00:00 Links between ocean temperature and iceberg discharge during Heinrich events Alvarez-Solas, J. Charbit, S. Ritz, C. Paillard, D. Ramstein, G. Dumas, C. Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA) Modélisation du climat (CLIM) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) EDGe 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)-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) ANR-05-BLAN-0310,IDEGLACE,Impact de Décharges d'Eau douce provenant de la GLace continentale sur le Climat Européen et méditerranéen(2005) European Project: 36305,NICE 2010-01 https://insu.hal.science/insu-00652843 https://doi.org/10.1038/ngeo752 en eng HAL CCSD Nature Publishing Group info:eu-repo/semantics/altIdentifier/doi/10.1038/ngeo752 info:eu-repo/grantAgreement//36305/EU/Network for Ice sheet and Climate Evolution/NICE insu-00652843 https://insu.hal.science/insu-00652843 doi:10.1038/ngeo752 ISSN: 1752-0894 Nature Geoscience https://insu.hal.science/insu-00652843 Nature Geoscience, 2010, 3 (2), pp.122 - 126. ⟨10.1038/ngeo752⟩ [SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology info:eu-repo/semantics/article Journal articles 2010 ftanrparis https://doi.org/10.1038/ngeo752 2024-05-16T14:21:54Z International audience Palaeoclimate records have revealed the presence of millennial-scale climate oscillations throughout the last glacial period1. Six periods of extreme cooling in the Northern Hemisphere--known as Heinrich events--were marked by an enhanced discharge of icebergs into the North Atlantic Ocean2, 3, increasing the deposition of ice-rafted debris2. Increased sliding at the base of ice sheets as a result of basal warming has been proposed to explain the iceberg pulses4, 5, 6, but recent observations7, 8 suggest that iceberg discharge is related to a strong coupling between ice sheets, ice shelves and ocean conditions. Here we use a conceptual numerical model to simulate the effect of ocean temperature on ice-shelf width, as well as the impact of the resultant changes in ice-shelf geometry on ice-stream velocities. Our results demonstrate that ocean temperature oscillations affect the basal melting of the ice shelf and will generate periodic pulses of iceberg discharge in an ice sheet with a fringing shelf. We also find that the irregular occurrence of Heinrich events seen in the palaeoclimate records can be simulated by periodic ocean forcing combined with varying accumulation rates of the ice sheet. Our model simulations support a link between millennial-scale ocean temperature variability and Heinrich events during the last glacial period. Article in Journal/Newspaper Ice Sheet Ice Shelf Ice Shelves North Atlantic Portail HAL-ANR (Agence Nationale de la Recherche) Nature Geoscience 3 2 122 126 |