A Holocene record of snow-avalanche and flood activity reconstructed from a lacustrine sedimentary sequence in Oldevatnet, western Norway
International audience Two lacustrine sediment cores from Oldevatnet in western Norway have been studied in order to produce a record of floods, mass-wasting events and glacier fluctuations during the last 7300 years. River floods, density currents and snow-avalanches have deposited distinct 'e...
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Online Access: | https://hal-insu.archives-ouvertes.fr/insu-00665776 https://doi.org/10.1177/0959683610391316 |
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ftccsdartic:oai:HAL:insu-00665776v1 2023-05-15T16:21:58+02:00 A Holocene record of snow-avalanche and flood activity reconstructed from a lacustrine sedimentary sequence in Oldevatnet, western Norway Vasskog, Kristian Nesje, Atle Nagel Støren, Eivind Waldmann, Nicolas Chapron, Emmanuel Ariztegui, Daniel Department of Earth Science Bergen (UiB) University of Bergen (UiB) Institut des Sciences de la Terre d'Orléans (ISTO) Université de Tours-Institut national des sciences de l'Univers (INSU - CNRS)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS) Institut Forel and Department of Geology and Paleontology University of Geneva Switzerland 2012 https://hal-insu.archives-ouvertes.fr/insu-00665776 https://doi.org/10.1177/0959683610391316 en eng HAL CCSD London: Sage info:eu-repo/semantics/altIdentifier/doi/10.1177/0959683610391316 insu-00665776 https://hal-insu.archives-ouvertes.fr/insu-00665776 doi:10.1177/0959683610391316 ISSN: 0959-6836 EISSN: 1477-0911 The Holocene https://hal-insu.archives-ouvertes.fr/insu-00665776 The Holocene, London: Sage, 2012, 21 (4), pp.597-614. ⟨10.1177/0959683610391316⟩ density currents floods Holocene palaeoclimate proglacial lake sediments snow-avalanches western Norway [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [SDE.MCG]Environmental Sciences/Global Changes info:eu-repo/semantics/article Journal articles 2012 ftccsdartic https://doi.org/10.1177/0959683610391316 2021-10-24T16:53:20Z International audience Two lacustrine sediment cores from Oldevatnet in western Norway have been studied in order to produce a record of floods, mass-wasting events and glacier fluctuations during the last 7300 years. River floods, density currents and snow-avalanches have deposited distinct 'event layers' at the lake floor throughout this time interval. In this study, a novel approach has been applied to distinguish event layers from the continuous background sedimentation, using Rb/Sr-ratios from X-Ray Fluorescence data. Grain-size distribution and the sedimentological parameters 'mean' and 'sorting' were used to further infer the depositional processes behind each layer. Our data suggest a record dominated by snow-avalanches, with the largest activity occurring during the 'Little Ice Age' (LIA). This increase in snow-avalanche activity observed during the LIA was probably caused by a combination of generally increasing winter precipitation and the advance of local glaciers towards the steep valley sides. Several fluctuations in snow-avalanche activity are also recognized prior to the LIA. Proxies of glacial activity from the background sediments indicate a similar development as earlier palaeoclimatic reconstructions from the area. It differs from previous reconstructions, however, by suggesting a lower glacial activity in the period from 2200 to 1000 cal. yr BP. Article in Journal/Newspaper glacier Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Norway The Holocene 21 4 597 614 |
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 |
density currents floods Holocene palaeoclimate proglacial lake sediments snow-avalanches western Norway [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [SDE.MCG]Environmental Sciences/Global Changes |
spellingShingle |
density currents floods Holocene palaeoclimate proglacial lake sediments snow-avalanches western Norway [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [SDE.MCG]Environmental Sciences/Global Changes Vasskog, Kristian Nesje, Atle Nagel Støren, Eivind Waldmann, Nicolas Chapron, Emmanuel Ariztegui, Daniel A Holocene record of snow-avalanche and flood activity reconstructed from a lacustrine sedimentary sequence in Oldevatnet, western Norway |
topic_facet |
density currents floods Holocene palaeoclimate proglacial lake sediments snow-avalanches western Norway [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [SDE.MCG]Environmental Sciences/Global Changes |
description |
International audience Two lacustrine sediment cores from Oldevatnet in western Norway have been studied in order to produce a record of floods, mass-wasting events and glacier fluctuations during the last 7300 years. River floods, density currents and snow-avalanches have deposited distinct 'event layers' at the lake floor throughout this time interval. In this study, a novel approach has been applied to distinguish event layers from the continuous background sedimentation, using Rb/Sr-ratios from X-Ray Fluorescence data. Grain-size distribution and the sedimentological parameters 'mean' and 'sorting' were used to further infer the depositional processes behind each layer. Our data suggest a record dominated by snow-avalanches, with the largest activity occurring during the 'Little Ice Age' (LIA). This increase in snow-avalanche activity observed during the LIA was probably caused by a combination of generally increasing winter precipitation and the advance of local glaciers towards the steep valley sides. Several fluctuations in snow-avalanche activity are also recognized prior to the LIA. Proxies of glacial activity from the background sediments indicate a similar development as earlier palaeoclimatic reconstructions from the area. It differs from previous reconstructions, however, by suggesting a lower glacial activity in the period from 2200 to 1000 cal. yr BP. |
author2 |
Department of Earth Science Bergen (UiB) University of Bergen (UiB) Institut des Sciences de la Terre d'Orléans (ISTO) Université de Tours-Institut national des sciences de l'Univers (INSU - CNRS)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS) Institut Forel and Department of Geology and Paleontology University of Geneva Switzerland |
format |
Article in Journal/Newspaper |
author |
Vasskog, Kristian Nesje, Atle Nagel Støren, Eivind Waldmann, Nicolas Chapron, Emmanuel Ariztegui, Daniel |
author_facet |
Vasskog, Kristian Nesje, Atle Nagel Støren, Eivind Waldmann, Nicolas Chapron, Emmanuel Ariztegui, Daniel |
author_sort |
Vasskog, Kristian |
title |
A Holocene record of snow-avalanche and flood activity reconstructed from a lacustrine sedimentary sequence in Oldevatnet, western Norway |
title_short |
A Holocene record of snow-avalanche and flood activity reconstructed from a lacustrine sedimentary sequence in Oldevatnet, western Norway |
title_full |
A Holocene record of snow-avalanche and flood activity reconstructed from a lacustrine sedimentary sequence in Oldevatnet, western Norway |
title_fullStr |
A Holocene record of snow-avalanche and flood activity reconstructed from a lacustrine sedimentary sequence in Oldevatnet, western Norway |
title_full_unstemmed |
A Holocene record of snow-avalanche and flood activity reconstructed from a lacustrine sedimentary sequence in Oldevatnet, western Norway |
title_sort |
holocene record of snow-avalanche and flood activity reconstructed from a lacustrine sedimentary sequence in oldevatnet, western norway |
publisher |
HAL CCSD |
publishDate |
2012 |
url |
https://hal-insu.archives-ouvertes.fr/insu-00665776 https://doi.org/10.1177/0959683610391316 |
geographic |
Norway |
geographic_facet |
Norway |
genre |
glacier |
genre_facet |
glacier |
op_source |
ISSN: 0959-6836 EISSN: 1477-0911 The Holocene https://hal-insu.archives-ouvertes.fr/insu-00665776 The Holocene, London: Sage, 2012, 21 (4), pp.597-614. ⟨10.1177/0959683610391316⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1177/0959683610391316 insu-00665776 https://hal-insu.archives-ouvertes.fr/insu-00665776 doi:10.1177/0959683610391316 |
op_doi |
https://doi.org/10.1177/0959683610391316 |
container_title |
The Holocene |
container_volume |
21 |
container_issue |
4 |
container_start_page |
597 |
op_container_end_page |
614 |
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1766009940577615872 |