How might the North American ice sheet influence the northwestern Eurasian climate?
International audience It is now widely acknowledged that past Northern Hemisphere ice sheets covering Canada and northern Europe at the Last Glacial Maximum (LGM) exerted a strong influence on climate by causing changes in atmospheric and oceanic circulations. In turn, these changes may have impact...
Published in: | Climate of the Past |
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Main Authors: | , , , , |
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Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2015
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Online Access: | https://insu.hal.science/insu-01320996 https://insu.hal.science/insu-01320996/document https://insu.hal.science/insu-01320996/file/CLIMATE%20OF%20THE%20PAST%20-%20How%20might%20the%20North%20American%20ice%20sheet%20influence%20the%20northwestern%20Eurasian%20climate.pdf https://doi.org/10.5194/cp-11-1467-2015 |
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English |
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[SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology |
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[SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology Beghin, P Charbit, S Dumas, Christophe Kageyama, M Ritz, C How might the North American ice sheet influence the northwestern Eurasian climate? |
topic_facet |
[SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology |
description |
International audience It is now widely acknowledged that past Northern Hemisphere ice sheets covering Canada and northern Europe at the Last Glacial Maximum (LGM) exerted a strong influence on climate by causing changes in atmospheric and oceanic circulations. In turn, these changes may have impacted the development of the ice sheets themselves through a combination of different feedback mechanisms. The present study is designed to investigate the potential impact of the North American ice sheet on the surface mass balance (SMB) of the Eurasian ice sheet driven by simulated changes in the past glacial atmospheric circulation. Using the LMDZ5 atmospheric circulation model, we carried out 12 experiments under constant LGM conditions for in-solation, greenhouse gases and ocean. In these experiments, the Eurasian ice sheet is removed. The 12 experiments differ in the North American ice-sheet topography, ranging from a white and flat (present-day topography) ice sheet to a full-size LGM ice sheet. This experimental design allows the albedo and the topographic impacts of the North American ice sheet onto the climate to be disentangled. The results are compared to our baseline experiment where both the North American and the Eurasian ice sheets have been removed. In summer, the sole albedo effect of the American ice sheet modifies the pattern of planetary waves with respect to the no-ice-sheet case, resulting in a cooling of the northwestern Eurasian region. By contrast, the atmospheric circulation changes induced by the topography of the North American ice sheet lead to a strong decrease of this cooling. In winter, the Scandinavian and the Barents–Kara regions respond differently to the American ice-sheet albedo effect: in response to atmospheric circulation changes, Scandinavia becomes warmer and total precipitation is more abundant, whereas the Barents–Kara area becomes cooler with a decrease of convective processes, causing a decrease of total precipitation. The gradual increase of the altitude of the American ... |
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)) 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) |
format |
Article in Journal/Newspaper |
author |
Beghin, P Charbit, S Dumas, Christophe Kageyama, M Ritz, C |
author_facet |
Beghin, P Charbit, S Dumas, Christophe Kageyama, M Ritz, C |
author_sort |
Beghin, P |
title |
How might the North American ice sheet influence the northwestern Eurasian climate? |
title_short |
How might the North American ice sheet influence the northwestern Eurasian climate? |
title_full |
How might the North American ice sheet influence the northwestern Eurasian climate? |
title_fullStr |
How might the North American ice sheet influence the northwestern Eurasian climate? |
title_full_unstemmed |
How might the North American ice sheet influence the northwestern Eurasian climate? |
title_sort |
how might the north american ice sheet influence the northwestern eurasian climate? |
publisher |
HAL CCSD |
publishDate |
2015 |
url |
https://insu.hal.science/insu-01320996 https://insu.hal.science/insu-01320996/document https://insu.hal.science/insu-01320996/file/CLIMATE%20OF%20THE%20PAST%20-%20How%20might%20the%20North%20American%20ice%20sheet%20influence%20the%20northwestern%20Eurasian%20climate.pdf https://doi.org/10.5194/cp-11-1467-2015 |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
ISSN: 1814-9324 EISSN: 1814-9332 Climate of the Past https://insu.hal.science/insu-01320996 Climate of the Past, 2015, 11 (10), pp.1467-1490. ⟨10.5194/cp-11-1467-2015⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/cp-11-1467-2015 insu-01320996 https://insu.hal.science/insu-01320996 https://insu.hal.science/insu-01320996/document https://insu.hal.science/insu-01320996/file/CLIMATE%20OF%20THE%20PAST%20-%20How%20might%20the%20North%20American%20ice%20sheet%20influence%20the%20northwestern%20Eurasian%20climate.pdf doi:10.5194/cp-11-1467-2015 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.5194/cp-11-1467-2015 |
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Climate of the Past |
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11 |
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10 |
container_start_page |
1467 |
op_container_end_page |
1490 |
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ftinsu:oai:HAL:insu-01320996v1 2024-04-28T08:24:33+00:00 How might the North American ice sheet influence the northwestern Eurasian climate? Beghin, P Charbit, S Dumas, Christophe Kageyama, M Ritz, 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)) 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) 2015 https://insu.hal.science/insu-01320996 https://insu.hal.science/insu-01320996/document https://insu.hal.science/insu-01320996/file/CLIMATE%20OF%20THE%20PAST%20-%20How%20might%20the%20North%20American%20ice%20sheet%20influence%20the%20northwestern%20Eurasian%20climate.pdf https://doi.org/10.5194/cp-11-1467-2015 en eng HAL CCSD European Geosciences Union (EGU) info:eu-repo/semantics/altIdentifier/doi/10.5194/cp-11-1467-2015 insu-01320996 https://insu.hal.science/insu-01320996 https://insu.hal.science/insu-01320996/document https://insu.hal.science/insu-01320996/file/CLIMATE%20OF%20THE%20PAST%20-%20How%20might%20the%20North%20American%20ice%20sheet%20influence%20the%20northwestern%20Eurasian%20climate.pdf doi:10.5194/cp-11-1467-2015 info:eu-repo/semantics/OpenAccess ISSN: 1814-9324 EISSN: 1814-9332 Climate of the Past https://insu.hal.science/insu-01320996 Climate of the Past, 2015, 11 (10), pp.1467-1490. ⟨10.5194/cp-11-1467-2015⟩ [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology info:eu-repo/semantics/article Journal articles 2015 ftinsu https://doi.org/10.5194/cp-11-1467-2015 2024-04-05T00:48:45Z International audience It is now widely acknowledged that past Northern Hemisphere ice sheets covering Canada and northern Europe at the Last Glacial Maximum (LGM) exerted a strong influence on climate by causing changes in atmospheric and oceanic circulations. In turn, these changes may have impacted the development of the ice sheets themselves through a combination of different feedback mechanisms. The present study is designed to investigate the potential impact of the North American ice sheet on the surface mass balance (SMB) of the Eurasian ice sheet driven by simulated changes in the past glacial atmospheric circulation. Using the LMDZ5 atmospheric circulation model, we carried out 12 experiments under constant LGM conditions for in-solation, greenhouse gases and ocean. In these experiments, the Eurasian ice sheet is removed. The 12 experiments differ in the North American ice-sheet topography, ranging from a white and flat (present-day topography) ice sheet to a full-size LGM ice sheet. This experimental design allows the albedo and the topographic impacts of the North American ice sheet onto the climate to be disentangled. The results are compared to our baseline experiment where both the North American and the Eurasian ice sheets have been removed. In summer, the sole albedo effect of the American ice sheet modifies the pattern of planetary waves with respect to the no-ice-sheet case, resulting in a cooling of the northwestern Eurasian region. By contrast, the atmospheric circulation changes induced by the topography of the North American ice sheet lead to a strong decrease of this cooling. In winter, the Scandinavian and the Barents–Kara regions respond differently to the American ice-sheet albedo effect: in response to atmospheric circulation changes, Scandinavia becomes warmer and total precipitation is more abundant, whereas the Barents–Kara area becomes cooler with a decrease of convective processes, causing a decrease of total precipitation. The gradual increase of the altitude of the American ... Article in Journal/Newspaper Ice Sheet Institut national des sciences de l'Univers: HAL-INSU Climate of the Past 11 10 1467 1490 |