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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Cambridge University Press
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ftdoajarticles:oai:doaj.org/article:208aa544cd5149338c43c71aea792b45 2023-05-15T16:40:32+02:00 Modelling the diversion of erratic boulders by the Valais Glacier during the last glacial maximum GUILLAUME JOUVET JULIEN SEGUINOT SUSAN IVY-OCHS MARTIN FUNK 2017-06-01T00:00:00Z https://doi.org/10.1017/jog.2017.7 https://doaj.org/article/208aa544cd5149338c43c71aea792b45 EN eng Cambridge University Press https://www.cambridge.org/core/product/identifier/S0022143017000077/type/journal_article https://doaj.org/toc/0022-1430 https://doaj.org/toc/1727-5652 doi:10.1017/jog.2017.7 0022-1430 1727-5652 https://doaj.org/article/208aa544cd5149338c43c71aea792b45 Journal of Glaciology, Vol 63, Pp 487-498 (2017) geomorphology ice-sheet modelling paleoclimate Environmental sciences GE1-350 Meteorology. Climatology QC851-999 article 2017 ftdoajarticles https://doi.org/10.1017/jog.2017.7 2023-03-12T01:30:59Z 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. Article in Journal/Newspaper Ice Sheet Journal of Glaciology Directory of Open Access Journals: DOAJ Articles Jura ENVELOPE(13.501,13.501,68.062,68.062) Mont Blanc ENVELOPE(69.468,69.468,-49.461,-49.461) Journal of Glaciology 63 239 487 498 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
geomorphology ice-sheet modelling paleoclimate Environmental sciences GE1-350 Meteorology. Climatology QC851-999 |
spellingShingle |
geomorphology ice-sheet modelling paleoclimate Environmental sciences GE1-350 Meteorology. Climatology QC851-999 GUILLAUME JOUVET JULIEN SEGUINOT SUSAN IVY-OCHS MARTIN FUNK Modelling the diversion of erratic boulders by the Valais Glacier during the last glacial maximum |
topic_facet |
geomorphology ice-sheet modelling paleoclimate Environmental sciences GE1-350 Meteorology. Climatology QC851-999 |
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. |
format |
Article in Journal/Newspaper |
author |
GUILLAUME JOUVET JULIEN SEGUINOT SUSAN IVY-OCHS MARTIN FUNK |
author_facet |
GUILLAUME JOUVET JULIEN SEGUINOT SUSAN IVY-OCHS MARTIN FUNK |
author_sort |
GUILLAUME JOUVET |
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 |
Cambridge University Press |
publishDate |
2017 |
url |
https://doi.org/10.1017/jog.2017.7 https://doaj.org/article/208aa544cd5149338c43c71aea792b45 |
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, Vol 63, Pp 487-498 (2017) |
op_relation |
https://www.cambridge.org/core/product/identifier/S0022143017000077/type/journal_article https://doaj.org/toc/0022-1430 https://doaj.org/toc/1727-5652 doi:10.1017/jog.2017.7 0022-1430 1727-5652 https://doaj.org/article/208aa544cd5149338c43c71aea792b45 |
op_doi |
https://doi.org/10.1017/jog.2017.7 |
container_title |
Journal of Glaciology |
container_volume |
63 |
container_issue |
239 |
container_start_page |
487 |
op_container_end_page |
498 |
_version_ |
1766030943494078464 |