Holocene glacier fluctuations in Greenland, contribution of cosmogenic surface exposure dating
Mountain glaciers and local ice caps are particularly sensitive to changes in temperature and precipitation in Greenland. A better understanding of glacier margins fluctuations over time will help to document the regional climate evolution and contribute to the determination of the different mechani...
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ftunivparis1:oai:HAL:tel-03771706v1 2024-09-15T18:02:09+00:00 Holocene glacier fluctuations in Greenland, contribution of cosmogenic surface exposure dating Fluctuations glaciaires holocènes au Groenland : contribution des datations cosmogéniques in situ Biette, Melody Laboratoire de géographie physique : Environnements Quaternaires et Actuels (LGP) Université Paris 1 Panthéon-Sorbonne (UP1)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS) Université Panthéon-Sorbonne - Paris I Vincent Jomelli Marie Chenet 2022-02-23 https://theses.hal.science/tel-03771706 https://theses.hal.science/tel-03771706/document https://theses.hal.science/tel-03771706/file/BIETTE.pdf fr fre HAL CCSD NNT: 2022PA01H014 tel-03771706 https://theses.hal.science/tel-03771706 https://theses.hal.science/tel-03771706/document https://theses.hal.science/tel-03771706/file/BIETTE.pdf info:eu-repo/semantics/OpenAccess https://theses.hal.science/tel-03771706 Géographie. Université Panthéon-Sorbonne - Paris I, 2022. Français. ⟨NNT : 2022PA01H014⟩ Glacier fluctuation Cosmogenic dating Holocene Greenland Fluctuation glacière Datation cosmogénique Holocène Groenland [SHS.GEO]Humanities and Social Sciences/Geography info:eu-repo/semantics/doctoralThesis Theses 2022 ftunivparis1 2024-07-01T23:39:36Z Mountain glaciers and local ice caps are particularly sensitive to changes in temperature and precipitation in Greenland. A better understanding of glacier margins fluctuations over time will help to document the regional climate evolution and contribute to the determination of the different mechanisms involved in climate variability in the Northern hemisphere. This work aims to improve our knowledge of glaciers evolution disconnected from the ice sheet in Greenland during the Holocene (i.e. the last 11.7 ka). In this end, the present study focuses on a geomorphological feature adjacent to the current glaciers: moraines. These rock accumulations were formed by erosion during past glacial extensions. In this study, 10Be cosmogenic moraines dating is used to document the evolution of seven glaciers across three parts of Greenland: Clavering Island (northeast), Tasilap valley (southeast) and Isortup valley (south). Combined to the other glacial chronologies in Greenland, this provides further evidence of a maximum glacial extension during the Early Holocene (11.7 – 8.2 ka). However, the most original results concern the identification of two new moraine stages showing glacial expansions during the Late Holocene (since 4.2 ka). These moraines were formed during the Middle of Neoglacial (~3 ka) in the three investigated sites of this thesis, and during the Dark Age Cold Period (~1.2-1.7 ka) in six of our seven glacial chronologies. By improving the spatial coverage of glacial chronologies in Greenland, it was also possible to reconsider the relationship between different climate forcing in the Northern Hemisphere. These new glacial chronologies can also contribute to the knowledge of the spatial heterogeneity of climate in the Northern Hemisphere. In parallel with the 10Be dating on moraines, a glaciological model (Degree-days) based on a pre-existing glacial chronology in Disko Island (central west) was applied to estimate temperature conditions responsible for glacial extension during the Medieval Climate Anomaly ... Doctoral or Postdoctoral Thesis Clavering Island glacier Greenland Groenland Ice Sheet Université Paris 1 Panthéon-Sorbonne: HAL |
institution |
Open Polar |
collection |
Université Paris 1 Panthéon-Sorbonne: HAL |
op_collection_id |
ftunivparis1 |
language |
French |
topic |
Glacier fluctuation Cosmogenic dating Holocene Greenland Fluctuation glacière Datation cosmogénique Holocène Groenland [SHS.GEO]Humanities and Social Sciences/Geography |
spellingShingle |
Glacier fluctuation Cosmogenic dating Holocene Greenland Fluctuation glacière Datation cosmogénique Holocène Groenland [SHS.GEO]Humanities and Social Sciences/Geography Biette, Melody Holocene glacier fluctuations in Greenland, contribution of cosmogenic surface exposure dating |
topic_facet |
Glacier fluctuation Cosmogenic dating Holocene Greenland Fluctuation glacière Datation cosmogénique Holocène Groenland [SHS.GEO]Humanities and Social Sciences/Geography |
description |
Mountain glaciers and local ice caps are particularly sensitive to changes in temperature and precipitation in Greenland. A better understanding of glacier margins fluctuations over time will help to document the regional climate evolution and contribute to the determination of the different mechanisms involved in climate variability in the Northern hemisphere. This work aims to improve our knowledge of glaciers evolution disconnected from the ice sheet in Greenland during the Holocene (i.e. the last 11.7 ka). In this end, the present study focuses on a geomorphological feature adjacent to the current glaciers: moraines. These rock accumulations were formed by erosion during past glacial extensions. In this study, 10Be cosmogenic moraines dating is used to document the evolution of seven glaciers across three parts of Greenland: Clavering Island (northeast), Tasilap valley (southeast) and Isortup valley (south). Combined to the other glacial chronologies in Greenland, this provides further evidence of a maximum glacial extension during the Early Holocene (11.7 – 8.2 ka). However, the most original results concern the identification of two new moraine stages showing glacial expansions during the Late Holocene (since 4.2 ka). These moraines were formed during the Middle of Neoglacial (~3 ka) in the three investigated sites of this thesis, and during the Dark Age Cold Period (~1.2-1.7 ka) in six of our seven glacial chronologies. By improving the spatial coverage of glacial chronologies in Greenland, it was also possible to reconsider the relationship between different climate forcing in the Northern Hemisphere. These new glacial chronologies can also contribute to the knowledge of the spatial heterogeneity of climate in the Northern Hemisphere. In parallel with the 10Be dating on moraines, a glaciological model (Degree-days) based on a pre-existing glacial chronology in Disko Island (central west) was applied to estimate temperature conditions responsible for glacial extension during the Medieval Climate Anomaly ... |
author2 |
Laboratoire de géographie physique : Environnements Quaternaires et Actuels (LGP) Université Paris 1 Panthéon-Sorbonne (UP1)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS) Université Panthéon-Sorbonne - Paris I Vincent Jomelli Marie Chenet |
format |
Doctoral or Postdoctoral Thesis |
author |
Biette, Melody |
author_facet |
Biette, Melody |
author_sort |
Biette, Melody |
title |
Holocene glacier fluctuations in Greenland, contribution of cosmogenic surface exposure dating |
title_short |
Holocene glacier fluctuations in Greenland, contribution of cosmogenic surface exposure dating |
title_full |
Holocene glacier fluctuations in Greenland, contribution of cosmogenic surface exposure dating |
title_fullStr |
Holocene glacier fluctuations in Greenland, contribution of cosmogenic surface exposure dating |
title_full_unstemmed |
Holocene glacier fluctuations in Greenland, contribution of cosmogenic surface exposure dating |
title_sort |
holocene glacier fluctuations in greenland, contribution of cosmogenic surface exposure dating |
publisher |
HAL CCSD |
publishDate |
2022 |
url |
https://theses.hal.science/tel-03771706 https://theses.hal.science/tel-03771706/document https://theses.hal.science/tel-03771706/file/BIETTE.pdf |
genre |
Clavering Island glacier Greenland Groenland Ice Sheet |
genre_facet |
Clavering Island glacier Greenland Groenland Ice Sheet |
op_source |
https://theses.hal.science/tel-03771706 Géographie. Université Panthéon-Sorbonne - Paris I, 2022. Français. ⟨NNT : 2022PA01H014⟩ |
op_relation |
NNT: 2022PA01H014 tel-03771706 https://theses.hal.science/tel-03771706 https://theses.hal.science/tel-03771706/document https://theses.hal.science/tel-03771706/file/BIETTE.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1810439431853703168 |