Temporal scales and deglaciation rhytms in a polar glacier margin, baronbreen, Svalbard
International audience Polar regions are very sensitive to climate variability. Glacial environments, such as Spitsbergen, respond drastically to climate warming by the disintegration of ice masses, release of huge amounts of free water and rapid evolution of terrestrial landforms. Paraglacial studi...
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Other Authors: | , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2008
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Online Access: | https://hal.archives-ouvertes.fr/hal-00347774 |
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ftccsdartic:oai:HAL:hal-00347774v1 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
climatic variability geomorphology jökulhlaup paraglacial sedimentology Spitsbergen Variabilité climatique géomorphologie paraglaciaire sédimentologie Spitsberg [SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology [SHS.GEO]Humanities and Social Sciences/Geography |
spellingShingle |
climatic variability geomorphology jökulhlaup paraglacial sedimentology Spitsbergen Variabilité climatique géomorphologie paraglaciaire sédimentologie Spitsberg [SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology [SHS.GEO]Humanities and Social Sciences/Geography Etienne, Samuel Mercier, Denis Voldoire, Olivier Temporal scales and deglaciation rhytms in a polar glacier margin, baronbreen, Svalbard |
topic_facet |
climatic variability geomorphology jökulhlaup paraglacial sedimentology Spitsbergen Variabilité climatique géomorphologie paraglaciaire sédimentologie Spitsberg [SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology [SHS.GEO]Humanities and Social Sciences/Geography |
description |
International audience Polar regions are very sensitive to climate variability. Glacial environments, such as Spitsbergen, respond drastically to climate warming by the disintegration of ice masses, release of huge amounts of free water and rapid evolution of terrestrial landforms. Paraglacial studies have shown that sediment yield decreases with time following a relaxation curve. The study examines the effects of scaling on rythms of deglaciation and sediment fluxes in a small catchment. The study site was located on the Kongsfjorden area, northwest Spistbergen, Svalbard, in the front of Baron and Conway glaciers (79°N, 12°20'E). The area consists of a patchwork of glacial and fluvioglacial deposits that are reworked or built by paraglacial processes, and was investigated for field geomorphological mapping. To reconstruct the kinematics of deglaciation since the end of the Little Ice Age, several photographics sources (from 1907 to 2004) have been collected and analysed. Sedimentological analyses were made of samples collected in the field. Grain-size deposits were analysed using wet- and dry- mechanical- sieving techniques to isolate the gravel and sand fractions. Fine fraction was measured using a Coulter LS230 laser granulometer. This study provides several insights into the relationship between temporal scales, climatic variability and geomorphological responses. Glacier response to climate variations is non-linear and not immediate and depends of the catchment size and induced differential geomorphological responses. In a source-to-sink-fluxes and sediment budget perspective, this example illustrates the different stages of the paraglacial sediment cascade. It appears that the paraglacial sequence, known as a morphogenic crisis, could be affected by internal small threshold events, which are able to mobilize large quantities of sediment. It means that, at small scale, the curve profile is more irregular than suggested by large-scale models. Les régions polaires sont très sensibles à la variabilité ... |
author2 |
Laboratoire de Géographie Physique et Environnementale (GEOLAB) Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Université Clermont Auvergne 2017-2020 (UCA 2017-2020 )-Université Clermont Auvergne (UCA)-Institut Sciences de l'Homme et de la Société (IR SHS UNILIM) Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS) Littoral, Environnement, Télédétection, Géomatique (LETG - Nantes) Institut de Géographie et d'Aménagement Régional de l'Université de Nantes (IGARUN) Université de Nantes (UN)-Université de Nantes (UN)-Université de Rennes 2 (UR2) Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Université de Brest (UBO)-Université de Caen Normandie (UNICAEN) Normandie Université (NU)-Normandie Université (NU)-École pratique des hautes études (EPHE) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Etienne, Samuel Mercier, Denis Voldoire, Olivier |
author_facet |
Etienne, Samuel Mercier, Denis Voldoire, Olivier |
author_sort |
Etienne, Samuel |
title |
Temporal scales and deglaciation rhytms in a polar glacier margin, baronbreen, Svalbard |
title_short |
Temporal scales and deglaciation rhytms in a polar glacier margin, baronbreen, Svalbard |
title_full |
Temporal scales and deglaciation rhytms in a polar glacier margin, baronbreen, Svalbard |
title_fullStr |
Temporal scales and deglaciation rhytms in a polar glacier margin, baronbreen, Svalbard |
title_full_unstemmed |
Temporal scales and deglaciation rhytms in a polar glacier margin, baronbreen, Svalbard |
title_sort |
temporal scales and deglaciation rhytms in a polar glacier margin, baronbreen, svalbard |
publisher |
HAL CCSD |
publishDate |
2008 |
url |
https://hal.archives-ouvertes.fr/hal-00347774 |
long_lat |
ENVELOPE(-61.422,-61.422,-62.841,-62.841) ENVELOPE(-58.033,-58.033,-83.283,-83.283) |
geographic |
Conway Coulter Svalbard |
geographic_facet |
Conway Coulter Svalbard |
genre |
glacier Kongsfjord* Kongsfjorden Spitsberg Svalbard Spitsbergen |
genre_facet |
glacier Kongsfjord* Kongsfjorden Spitsberg Svalbard Spitsbergen |
op_source |
ISSN: 0029-1951 Norsk Geografisk Tidsskrift / Norwegian Journal of Geography https://hal.archives-ouvertes.fr/hal-00347774 Norsk Geografisk Tidsskrift / Norwegian Journal of Geography, Taylor & Francis (Routledge), 2008, 62, pp.102-114 |
op_relation |
hal-00347774 https://hal.archives-ouvertes.fr/hal-00347774 |
_version_ |
1766010218927357952 |
spelling |
ftccsdartic:oai:HAL:hal-00347774v1 2023-05-15T16:22:15+02:00 Temporal scales and deglaciation rhytms in a polar glacier margin, baronbreen, Svalbard Etienne, Samuel Mercier, Denis Voldoire, Olivier Laboratoire de Géographie Physique et Environnementale (GEOLAB) Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Université Clermont Auvergne 2017-2020 (UCA 2017-2020 )-Université Clermont Auvergne (UCA)-Institut Sciences de l'Homme et de la Société (IR SHS UNILIM) Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS) Littoral, Environnement, Télédétection, Géomatique (LETG - Nantes) Institut de Géographie et d'Aménagement Régional de l'Université de Nantes (IGARUN) Université de Nantes (UN)-Université de Nantes (UN)-Université de Rennes 2 (UR2) Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Université de Brest (UBO)-Université de Caen Normandie (UNICAEN) Normandie Université (NU)-Normandie Université (NU)-École pratique des hautes études (EPHE) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS) 2008 https://hal.archives-ouvertes.fr/hal-00347774 en eng HAL CCSD Taylor & Francis (Routledge) hal-00347774 https://hal.archives-ouvertes.fr/hal-00347774 ISSN: 0029-1951 Norsk Geografisk Tidsskrift / Norwegian Journal of Geography https://hal.archives-ouvertes.fr/hal-00347774 Norsk Geografisk Tidsskrift / Norwegian Journal of Geography, Taylor & Francis (Routledge), 2008, 62, pp.102-114 climatic variability geomorphology jökulhlaup paraglacial sedimentology Spitsbergen Variabilité climatique géomorphologie paraglaciaire sédimentologie Spitsberg [SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology [SHS.GEO]Humanities and Social Sciences/Geography info:eu-repo/semantics/article Journal articles 2008 ftccsdartic 2021-12-26T00:34:25Z International audience Polar regions are very sensitive to climate variability. Glacial environments, such as Spitsbergen, respond drastically to climate warming by the disintegration of ice masses, release of huge amounts of free water and rapid evolution of terrestrial landforms. Paraglacial studies have shown that sediment yield decreases with time following a relaxation curve. The study examines the effects of scaling on rythms of deglaciation and sediment fluxes in a small catchment. The study site was located on the Kongsfjorden area, northwest Spistbergen, Svalbard, in the front of Baron and Conway glaciers (79°N, 12°20'E). The area consists of a patchwork of glacial and fluvioglacial deposits that are reworked or built by paraglacial processes, and was investigated for field geomorphological mapping. To reconstruct the kinematics of deglaciation since the end of the Little Ice Age, several photographics sources (from 1907 to 2004) have been collected and analysed. Sedimentological analyses were made of samples collected in the field. Grain-size deposits were analysed using wet- and dry- mechanical- sieving techniques to isolate the gravel and sand fractions. Fine fraction was measured using a Coulter LS230 laser granulometer. This study provides several insights into the relationship between temporal scales, climatic variability and geomorphological responses. Glacier response to climate variations is non-linear and not immediate and depends of the catchment size and induced differential geomorphological responses. In a source-to-sink-fluxes and sediment budget perspective, this example illustrates the different stages of the paraglacial sediment cascade. It appears that the paraglacial sequence, known as a morphogenic crisis, could be affected by internal small threshold events, which are able to mobilize large quantities of sediment. It means that, at small scale, the curve profile is more irregular than suggested by large-scale models. Les régions polaires sont très sensibles à la variabilité ... Article in Journal/Newspaper glacier Kongsfjord* Kongsfjorden Spitsberg Svalbard Spitsbergen Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Conway ENVELOPE(-61.422,-61.422,-62.841,-62.841) Coulter ENVELOPE(-58.033,-58.033,-83.283,-83.283) Svalbard |