The key role of topography in altering North Atlantic atmospheric circulation during the last glacial period
International audience The Last Glacial Maximum (LGM; 21 000 yr before present) was a period of low atmospheric greenhouse gas concentrations, when vast ice sheets covered large parts of North America and Europe. Paleoclimate reconstructions and modeling studies suggest that the atmospheric circulat...
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ftinsu:oai:HAL:hal-02931766v1 2024-04-28T08:24:40+00:00 The key role of topography in altering North Atlantic atmospheric circulation during the last glacial period Pausata, F. Li, C. Wettstein, J., J. Kageyama, M. Nisancioglu, K. Geophysical Institute Bergen (GFI / BiU) University of Bergen (UiB) Bjerknes Centre for Climate Research (BCCR) Department of Biological Sciences Bergen (BIO / UiB) University of Bergen (UiB)-University of Bergen (UiB) Department of Earth Science Bergen (UiB) Oregon State University (OSU) 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)) 2011 https://hal.science/hal-02931766 https://hal.science/hal-02931766/document https://hal.science/hal-02931766/file/cp-7-1089-2011.pdf https://doi.org/10.5194/cp-7-1089-2011 en eng HAL CCSD European Geosciences Union (EGU) info:eu-repo/semantics/altIdentifier/doi/10.5194/cp-7-1089-2011 hal-02931766 https://hal.science/hal-02931766 https://hal.science/hal-02931766/document https://hal.science/hal-02931766/file/cp-7-1089-2011.pdf doi:10.5194/cp-7-1089-2011 info:eu-repo/semantics/OpenAccess ISSN: 1814-9324 EISSN: 1814-9332 Climate of the Past https://hal.science/hal-02931766 Climate of the Past, 2011, 7 (4), pp.1089-1101. ⟨10.5194/cp-7-1089-2011⟩ [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 2011 ftinsu https://doi.org/10.5194/cp-7-1089-2011 2024-04-05T00:41:30Z International audience The Last Glacial Maximum (LGM; 21 000 yr before present) was a period of low atmospheric greenhouse gas concentrations, when vast ice sheets covered large parts of North America and Europe. Paleoclimate reconstructions and modeling studies suggest that the atmospheric circulation was substantially altered compared to today, both in terms of its mean state and its variability. Here we present a suite of coupled model simulations designed to investigate both the separate and combined influences of the main LGM boundary condition changes (greenhouse gases, ice sheet topography and ice sheet albedo) on the mean state and variability of the atmospheric circulation as represented by sea level pressure (SLP) and 200-hPa zonal wind in the North Atlantic sector. We find that ice sheet topography accounts for most of the simulated changes during the LGM. Greenhouse gases and ice sheet albedo affect the SLP gradient in the North Atlantic, but the overall placement of high and low pressure centers is controlled by topography. Additional analysis shows that North Atlantic sea surface temperatures and sea ice edge position do not substantially influence the pattern of the climatological-mean SLP field, SLP variability or the position of the North Atlantic jet in the LGM. Article in Journal/Newspaper Ice Sheet North Atlantic Sea ice Institut national des sciences de l'Univers: HAL-INSU Climate of the Past 7 4 1089 1101 |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
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 Pausata, F. Li, C. Wettstein, J., J. Kageyama, M. Nisancioglu, K. The key role of topography in altering North Atlantic atmospheric circulation during the last glacial period |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment |
description |
International audience The Last Glacial Maximum (LGM; 21 000 yr before present) was a period of low atmospheric greenhouse gas concentrations, when vast ice sheets covered large parts of North America and Europe. Paleoclimate reconstructions and modeling studies suggest that the atmospheric circulation was substantially altered compared to today, both in terms of its mean state and its variability. Here we present a suite of coupled model simulations designed to investigate both the separate and combined influences of the main LGM boundary condition changes (greenhouse gases, ice sheet topography and ice sheet albedo) on the mean state and variability of the atmospheric circulation as represented by sea level pressure (SLP) and 200-hPa zonal wind in the North Atlantic sector. We find that ice sheet topography accounts for most of the simulated changes during the LGM. Greenhouse gases and ice sheet albedo affect the SLP gradient in the North Atlantic, but the overall placement of high and low pressure centers is controlled by topography. Additional analysis shows that North Atlantic sea surface temperatures and sea ice edge position do not substantially influence the pattern of the climatological-mean SLP field, SLP variability or the position of the North Atlantic jet in the LGM. |
author2 |
Geophysical Institute Bergen (GFI / BiU) University of Bergen (UiB) Bjerknes Centre for Climate Research (BCCR) Department of Biological Sciences Bergen (BIO / UiB) University of Bergen (UiB)-University of Bergen (UiB) Department of Earth Science Bergen (UiB) Oregon State University (OSU) 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)) |
format |
Article in Journal/Newspaper |
author |
Pausata, F. Li, C. Wettstein, J., J. Kageyama, M. Nisancioglu, K. |
author_facet |
Pausata, F. Li, C. Wettstein, J., J. Kageyama, M. Nisancioglu, K. |
author_sort |
Pausata, F. |
title |
The key role of topography in altering North Atlantic atmospheric circulation during the last glacial period |
title_short |
The key role of topography in altering North Atlantic atmospheric circulation during the last glacial period |
title_full |
The key role of topography in altering North Atlantic atmospheric circulation during the last glacial period |
title_fullStr |
The key role of topography in altering North Atlantic atmospheric circulation during the last glacial period |
title_full_unstemmed |
The key role of topography in altering North Atlantic atmospheric circulation during the last glacial period |
title_sort |
key role of topography in altering north atlantic atmospheric circulation during the last glacial period |
publisher |
HAL CCSD |
publishDate |
2011 |
url |
https://hal.science/hal-02931766 https://hal.science/hal-02931766/document https://hal.science/hal-02931766/file/cp-7-1089-2011.pdf https://doi.org/10.5194/cp-7-1089-2011 |
genre |
Ice Sheet North Atlantic Sea ice |
genre_facet |
Ice Sheet North Atlantic Sea ice |
op_source |
ISSN: 1814-9324 EISSN: 1814-9332 Climate of the Past https://hal.science/hal-02931766 Climate of the Past, 2011, 7 (4), pp.1089-1101. ⟨10.5194/cp-7-1089-2011⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/cp-7-1089-2011 hal-02931766 https://hal.science/hal-02931766 https://hal.science/hal-02931766/document https://hal.science/hal-02931766/file/cp-7-1089-2011.pdf doi:10.5194/cp-7-1089-2011 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.5194/cp-7-1089-2011 |
container_title |
Climate of the Past |
container_volume |
7 |
container_issue |
4 |
container_start_page |
1089 |
op_container_end_page |
1101 |
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1797584805298176000 |