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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ftccsdartic:oai:HAL:hal-04113883v1 2023-06-18T03:41:12+02:00 The key role of topography in altering North Atlantic atmospheric circulation during the last glacial period Pausata, F. S. R. Li, C. Wettstein, J. J. Kageyama, M. Nisancioglu, K. H. Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS) 2011 https://hal.science/hal-04113883 https://doi.org/10.5194/cp-7-1089-201110.5194/cpd-7-575-2011 en eng HAL CCSD info:eu-repo/semantics/altIdentifier/doi/10.5194/cp-7-1089-201110.5194/cpd-7-575-2011 hal-04113883 https://hal.science/hal-04113883 BIBCODE: 2011CliPa.7.1089P doi:10.5194/cp-7-1089-201110.5194/cpd-7-575-2011 Climate of the Past https://hal.science/hal-04113883 Climate of the Past, 2011, 7, pp.1089-1101. ⟨10.5194/cp-7-1089-201110.5194/cpd-7-575-2011⟩ Earth Science [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2011 ftccsdartic https://doi.org/10.5194/cp-7-1089-201110.5194/cpd-7-575-2011 2023-06-03T23:50:36Z 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 Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
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Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
Earth Science [SDU]Sciences of the Universe [physics] |
spellingShingle |
Earth Science [SDU]Sciences of the Universe [physics] Pausata, F. S. R. Li, C. Wettstein, J. J. Kageyama, M. Nisancioglu, K. H. The key role of topography in altering North Atlantic atmospheric circulation during the last glacial period |
topic_facet |
Earth Science [SDU]Sciences of the Universe [physics] |
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 |
Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Pausata, F. S. R. Li, C. Wettstein, J. J. Kageyama, M. Nisancioglu, K. H. |
author_facet |
Pausata, F. S. R. Li, C. Wettstein, J. J. Kageyama, M. Nisancioglu, K. H. |
author_sort |
Pausata, F. S. R. |
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-04113883 https://doi.org/10.5194/cp-7-1089-201110.5194/cpd-7-575-2011 |
genre |
Ice Sheet North Atlantic Sea ice |
genre_facet |
Ice Sheet North Atlantic Sea ice |
op_source |
Climate of the Past https://hal.science/hal-04113883 Climate of the Past, 2011, 7, pp.1089-1101. ⟨10.5194/cp-7-1089-201110.5194/cpd-7-575-2011⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/cp-7-1089-201110.5194/cpd-7-575-2011 hal-04113883 https://hal.science/hal-04113883 BIBCODE: 2011CliPa.7.1089P doi:10.5194/cp-7-1089-201110.5194/cpd-7-575-2011 |
op_doi |
https://doi.org/10.5194/cp-7-1089-201110.5194/cpd-7-575-2011 |
_version_ |
1769006676727300096 |