On the Late Saalian glaciation (160 - 140 ka): a climate modeling study
Rédigé le 8 mai 2009 Accepté pour soutenance le 15 juillet 2009 This thesis focuses on the glaciation of the Late Saalian period (160 -140 ka) over Eurasia. The Quaternary Environment of the Eurasian North project evidenced that during this period, the Eurasian ice sheet was substantially larger tha...
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Other Authors: | , , , , , , , , , , , |
Format: | Doctoral or Postdoctoral Thesis |
Language: | English |
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HAL CCSD
2009
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Online Access: | https://theses.hal.science/tel-00418445 https://theses.hal.science/tel-00418445/document https://theses.hal.science/tel-00418445/file/these-colleoni.pdf |
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ftunivnantes:oai:HAL:tel-00418445v1 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
English |
topic |
atmospheric modeling ice sheets surface mass balance paleoclimate dust proglacial lakes sea surface temperature Saalian Quaternary modélisation atmosphérique calottes de glace bilan de masse en surface paleoclimat végétation poussières lacs proglaciaires température de surface océanique Saalien Quaternaire [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology |
spellingShingle |
atmospheric modeling ice sheets surface mass balance paleoclimate dust proglacial lakes sea surface temperature Saalian Quaternary modélisation atmosphérique calottes de glace bilan de masse en surface paleoclimat végétation poussières lacs proglaciaires température de surface océanique Saalien Quaternaire [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology Colleoni, Florence On the Late Saalian glaciation (160 - 140 ka): a climate modeling study |
topic_facet |
atmospheric modeling ice sheets surface mass balance paleoclimate dust proglacial lakes sea surface temperature Saalian Quaternary modélisation atmosphérique calottes de glace bilan de masse en surface paleoclimat végétation poussières lacs proglaciaires température de surface océanique Saalien Quaternaire [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology |
description |
Rédigé le 8 mai 2009 Accepté pour soutenance le 15 juillet 2009 This thesis focuses on the glaciation of the Late Saalian period (160 -140 ka) over Eurasia. The Quaternary Environment of the Eurasian North project evidenced that during this period, the Eurasian ice sheet was substantially larger than during the entire Weichselian cycle and especially than during the Last Glacial Maximum (21 ka, LGM). The Late Saalian astronomical forcing were different than during the LGM while greenhouse gas concentrations were similar. To understand how this ice sheet could have grown so large over Eurasia during the Late Saalian, we use an Atmospherical General Circulation Model (AGCM), an AGCM coupled to an oceanic mixed layer and a vegetation model to explore the influence of regional parameters, sea surface temperatures (SST) and orbital parameters on the surface mass balance (SMB) of the Late Saalian Eurasian ice sheet. At 140 ka, proglacial lakes, vegetation and simulated Late Saalian SST cool the Eurasian climate, reducing the ablation along the southen margins. Dust deposition on snow have the opposite effect. The presence of a Canada Basin ice-shelf during MIS 6 in the Arctic Ocean, does not affect the mass balance of the ice sheet. According to geological evidences, the Late Saalian Eurasian ice sheet reached its maximum extent before 160 ka. Northern Hemisphere high latitudes summer insolation shows a large insolation peak towards 150 ka. The simulated climate prior to 140 ka is milder and ablation is larger along the southern margins of the Eurasian ice sheet although the mean annual SMB is positive. The Late Saalian Eurasian ice sheet, may have been large enough to generate its own cooling needed for its maintenance over Eurasia. Ce travail se concentre essentiellement sur le glaciation de la fin du Saalien (160 -140 ka) en Eurasie. Les résultats du projet Quaternary Environment of the Eurasian North montrent que durant cette période, la calotte Eurasienne était plus grosse que durant le Dernier Maximum ... |
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) Université Joseph-Fourier - Grenoble I Stockholm University Gerhard Krinner and Martin Jakobsson(krinner@lgge.obs.ujf-grenoble.fr martin.jakobsson@geo.su.se) ANR IDEGLACE SUCLIM (Stockholm Univ.) The Bert Bolin Center for Climate Research Explora Doc Lavoisier Cotutelle |
format |
Doctoral or Postdoctoral Thesis |
author |
Colleoni, Florence |
author_facet |
Colleoni, Florence |
author_sort |
Colleoni, Florence |
title |
On the Late Saalian glaciation (160 - 140 ka): a climate modeling study |
title_short |
On the Late Saalian glaciation (160 - 140 ka): a climate modeling study |
title_full |
On the Late Saalian glaciation (160 - 140 ka): a climate modeling study |
title_fullStr |
On the Late Saalian glaciation (160 - 140 ka): a climate modeling study |
title_full_unstemmed |
On the Late Saalian glaciation (160 - 140 ka): a climate modeling study |
title_sort |
on the late saalian glaciation (160 - 140 ka): a climate modeling study |
publisher |
HAL CCSD |
publishDate |
2009 |
url |
https://theses.hal.science/tel-00418445 https://theses.hal.science/tel-00418445/document https://theses.hal.science/tel-00418445/file/these-colleoni.pdf |
geographic |
Arctic Arctic Ocean Canada |
geographic_facet |
Arctic Arctic Ocean Canada |
genre |
Arctic Arctic Ocean canada basin Ice Sheet Ice Shelf |
genre_facet |
Arctic Arctic Ocean canada basin Ice Sheet Ice Shelf |
op_source |
https://theses.hal.science/tel-00418445 Climatology. Université Joseph-Fourier - Grenoble I; Stockholm University, 2009. English. ⟨NNT : ⟩ |
op_relation |
tel-00418445 https://theses.hal.science/tel-00418445 https://theses.hal.science/tel-00418445/document https://theses.hal.science/tel-00418445/file/these-colleoni.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1766348971354095616 |
spelling |
ftunivnantes:oai:HAL:tel-00418445v1 2023-05-15T15:18:48+02:00 On the Late Saalian glaciation (160 - 140 ka): a climate modeling study La glaciation de la fin du Saalien (160 - 140 ka): modélisation du climat Colleoni, Florence 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) Université Joseph-Fourier - Grenoble I Stockholm University Gerhard Krinner and Martin Jakobsson(krinner@lgge.obs.ujf-grenoble.fr martin.jakobsson@geo.su.se) ANR IDEGLACE SUCLIM (Stockholm Univ.) The Bert Bolin Center for Climate Research Explora Doc Lavoisier Cotutelle 2009-09-14 https://theses.hal.science/tel-00418445 https://theses.hal.science/tel-00418445/document https://theses.hal.science/tel-00418445/file/these-colleoni.pdf en eng HAL CCSD tel-00418445 https://theses.hal.science/tel-00418445 https://theses.hal.science/tel-00418445/document https://theses.hal.science/tel-00418445/file/these-colleoni.pdf info:eu-repo/semantics/OpenAccess https://theses.hal.science/tel-00418445 Climatology. Université Joseph-Fourier - Grenoble I; Stockholm University, 2009. English. ⟨NNT : ⟩ atmospheric modeling ice sheets surface mass balance paleoclimate dust proglacial lakes sea surface temperature Saalian Quaternary modélisation atmosphérique calottes de glace bilan de masse en surface paleoclimat végétation poussières lacs proglaciaires température de surface océanique Saalien Quaternaire [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology info:eu-repo/semantics/doctoralThesis Theses 2009 ftunivnantes 2023-03-08T00:36:41Z Rédigé le 8 mai 2009 Accepté pour soutenance le 15 juillet 2009 This thesis focuses on the glaciation of the Late Saalian period (160 -140 ka) over Eurasia. The Quaternary Environment of the Eurasian North project evidenced that during this period, the Eurasian ice sheet was substantially larger than during the entire Weichselian cycle and especially than during the Last Glacial Maximum (21 ka, LGM). The Late Saalian astronomical forcing were different than during the LGM while greenhouse gas concentrations were similar. To understand how this ice sheet could have grown so large over Eurasia during the Late Saalian, we use an Atmospherical General Circulation Model (AGCM), an AGCM coupled to an oceanic mixed layer and a vegetation model to explore the influence of regional parameters, sea surface temperatures (SST) and orbital parameters on the surface mass balance (SMB) of the Late Saalian Eurasian ice sheet. At 140 ka, proglacial lakes, vegetation and simulated Late Saalian SST cool the Eurasian climate, reducing the ablation along the southen margins. Dust deposition on snow have the opposite effect. The presence of a Canada Basin ice-shelf during MIS 6 in the Arctic Ocean, does not affect the mass balance of the ice sheet. According to geological evidences, the Late Saalian Eurasian ice sheet reached its maximum extent before 160 ka. Northern Hemisphere high latitudes summer insolation shows a large insolation peak towards 150 ka. The simulated climate prior to 140 ka is milder and ablation is larger along the southern margins of the Eurasian ice sheet although the mean annual SMB is positive. The Late Saalian Eurasian ice sheet, may have been large enough to generate its own cooling needed for its maintenance over Eurasia. Ce travail se concentre essentiellement sur le glaciation de la fin du Saalien (160 -140 ka) en Eurasie. Les résultats du projet Quaternary Environment of the Eurasian North montrent que durant cette période, la calotte Eurasienne était plus grosse que durant le Dernier Maximum ... Doctoral or Postdoctoral Thesis Arctic Arctic Ocean canada basin Ice Sheet Ice Shelf Université de Nantes: HAL-UNIV-NANTES Arctic Arctic Ocean Canada |