Modelling the diversion of erratic boulders by the Valais Glacier during the last glacial maximum
In this study, a modelling approach was used to investigate the cause of the diversion of erratic boulders from Mont Blanc and southern Valais by the Valais Glacier to the Solothurn lobe during the Last Glacial Maximum (LGM). Using the Parallel Ice Sheet Model, we simulated the ice flow field during...
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ftethz:oai:www.research-collection.ethz.ch:20.500.11850/190439 2023-05-15T16:40:33+02:00 Modelling the diversion of erratic boulders by the Valais Glacier during the last glacial maximum Jouvet, Guillaume Seguinot, Julien Ivy-Ochs, Susan Funk, Martin 2017-06 application/application/pdf https://hdl.handle.net/20.500.11850/190439 https://doi.org/10.3929/ethz-b-000190439 en eng International Glaciological Society info:eu-repo/semantics/altIdentifier/doi/10.1017/jog.2017.7 info:eu-repo/semantics/altIdentifier/wos/000401649100008 http://hdl.handle.net/20.500.11850/190439 doi:10.3929/ethz-b-000190439 info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International CC-BY Journal of Glaciology, 63 (239) Geomorphology ice-sheet modelling paleoclimate info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2017 ftethz https://doi.org/20.500.11850/190439 https://doi.org/10.3929/ethz-b-000190439 https://doi.org/10.1017/jog.2017.7 2023-02-13T00:41:32Z In this study, a modelling approach was used to investigate the cause of the diversion of erratic boulders from Mont Blanc and southern Valais by the Valais Glacier to the Solothurn lobe during the Last Glacial Maximum (LGM). Using the Parallel Ice Sheet Model, we simulated the ice flow field during the LGM, and analyzed the trajectories taken by erratic boulders from areas with characteristic lithologies. The main difficulty in this exercise laid with the large uncertainties affecting the paleo climate forcing required as input for the surface mass-balance model. In order to mimic the prevailing climate conditions during the LGM, we applied different temperature offsets and regional precipitation corrections to present-day climate data, and selected the parametrizations, which yielded the best match between the modelled ice extent and the geomorphologically-based ice-margin reconstruction. After running a range of simulations with varying parameters, our results showed that only one parametrization allowed boulders to be diverted to the Solothurn lobe during the LGM. This precipitation pattern supports the existing theory of preferential southwesterly advection of moisture to the alps during the LGM, but also indicates strongly enhanced precipitation over the Mont Blanc massif and enhanced cooling over the Jura Mountains. ISSN:0022-1430 ISSN:1727-5652 Article in Journal/Newspaper Ice Sheet Journal of Glaciology ETH Zürich Research Collection Jura ENVELOPE(13.501,13.501,68.062,68.062) Mont Blanc ENVELOPE(69.468,69.468,-49.461,-49.461) |
institution |
Open Polar |
collection |
ETH Zürich Research Collection |
op_collection_id |
ftethz |
language |
English |
topic |
Geomorphology ice-sheet modelling paleoclimate |
spellingShingle |
Geomorphology ice-sheet modelling paleoclimate Jouvet, Guillaume Seguinot, Julien Ivy-Ochs, Susan Funk, Martin Modelling the diversion of erratic boulders by the Valais Glacier during the last glacial maximum |
topic_facet |
Geomorphology ice-sheet modelling paleoclimate |
description |
In this study, a modelling approach was used to investigate the cause of the diversion of erratic boulders from Mont Blanc and southern Valais by the Valais Glacier to the Solothurn lobe during the Last Glacial Maximum (LGM). Using the Parallel Ice Sheet Model, we simulated the ice flow field during the LGM, and analyzed the trajectories taken by erratic boulders from areas with characteristic lithologies. The main difficulty in this exercise laid with the large uncertainties affecting the paleo climate forcing required as input for the surface mass-balance model. In order to mimic the prevailing climate conditions during the LGM, we applied different temperature offsets and regional precipitation corrections to present-day climate data, and selected the parametrizations, which yielded the best match between the modelled ice extent and the geomorphologically-based ice-margin reconstruction. After running a range of simulations with varying parameters, our results showed that only one parametrization allowed boulders to be diverted to the Solothurn lobe during the LGM. This precipitation pattern supports the existing theory of preferential southwesterly advection of moisture to the alps during the LGM, but also indicates strongly enhanced precipitation over the Mont Blanc massif and enhanced cooling over the Jura Mountains. ISSN:0022-1430 ISSN:1727-5652 |
format |
Article in Journal/Newspaper |
author |
Jouvet, Guillaume Seguinot, Julien Ivy-Ochs, Susan Funk, Martin |
author_facet |
Jouvet, Guillaume Seguinot, Julien Ivy-Ochs, Susan Funk, Martin |
author_sort |
Jouvet, Guillaume |
title |
Modelling the diversion of erratic boulders by the Valais Glacier during the last glacial maximum |
title_short |
Modelling the diversion of erratic boulders by the Valais Glacier during the last glacial maximum |
title_full |
Modelling the diversion of erratic boulders by the Valais Glacier during the last glacial maximum |
title_fullStr |
Modelling the diversion of erratic boulders by the Valais Glacier during the last glacial maximum |
title_full_unstemmed |
Modelling the diversion of erratic boulders by the Valais Glacier during the last glacial maximum |
title_sort |
modelling the diversion of erratic boulders by the valais glacier during the last glacial maximum |
publisher |
International Glaciological Society |
publishDate |
2017 |
url |
https://hdl.handle.net/20.500.11850/190439 https://doi.org/10.3929/ethz-b-000190439 |
long_lat |
ENVELOPE(13.501,13.501,68.062,68.062) ENVELOPE(69.468,69.468,-49.461,-49.461) |
geographic |
Jura Mont Blanc |
geographic_facet |
Jura Mont Blanc |
genre |
Ice Sheet Journal of Glaciology |
genre_facet |
Ice Sheet Journal of Glaciology |
op_source |
Journal of Glaciology, 63 (239) |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1017/jog.2017.7 info:eu-repo/semantics/altIdentifier/wos/000401649100008 http://hdl.handle.net/20.500.11850/190439 doi:10.3929/ethz-b-000190439 |
op_rights |
info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/20.500.11850/190439 https://doi.org/10.3929/ethz-b-000190439 https://doi.org/10.1017/jog.2017.7 |
_version_ |
1766030954678190080 |