Kinematic response of ice-rise divides to changes in ocean and atmosphere forcing
International audience The majority of Antarctic ice shelves are bounded by grounded ice rises. These ice rises exhibit local flow fields that partially oppose the flow of the surrounding ice shelves. Formation of ice rises is accompanied by a characteristic upward-arching internal stratigraphy (“Ra...
Published in: | The Cryosphere |
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ftunivnantes:oai:HAL:hal-03031569v1 2023-05-15T13:43:24+02:00 Kinematic response of ice-rise divides to changes in ocean and atmosphere forcing Schannwell, Clemens Drews, Reinhard Ehlers, Todd Eisen, Olaf Mayer, Christoph Gillet-Chaulet, F Institut des Géosciences de l’Environnement (IGE) Institut de Recherche pour le Développement (IRD)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes 2016-2019 (UGA 2016-2019 ) 2019 https://hal.science/hal-03031569 https://hal.science/hal-03031569/document https://hal.science/hal-03031569/file/Schannwell%20et%20al.%20-%202019%20-%20Kinematic%20response%20of%20ice-rise%20divides%20to%20changes%20.pdf https://doi.org/10.5194/tc-13-2673-2019 en eng HAL CCSD Copernicus info:eu-repo/semantics/altIdentifier/doi/10.5194/tc-13-2673-2019 hal-03031569 https://hal.science/hal-03031569 https://hal.science/hal-03031569/document https://hal.science/hal-03031569/file/Schannwell%20et%20al.%20-%202019%20-%20Kinematic%20response%20of%20ice-rise%20divides%20to%20changes%20.pdf doi:10.5194/tc-13-2673-2019 info:eu-repo/semantics/OpenAccess ISSN: 1994-0424 EISSN: 1994-0416 The Cryosphere https://hal.science/hal-03031569 The Cryosphere, 2019, 13 (10), pp.2673-2691. ⟨10.5194/tc-13-2673-2019⟩ [SDE]Environmental Sciences info:eu-repo/semantics/article Journal articles 2019 ftunivnantes https://doi.org/10.5194/tc-13-2673-2019 2023-03-01T02:51:26Z International audience The majority of Antarctic ice shelves are bounded by grounded ice rises. These ice rises exhibit local flow fields that partially oppose the flow of the surrounding ice shelves. Formation of ice rises is accompanied by a characteristic upward-arching internal stratigraphy (“Raymond arches”), whose geometry can be analysed to infer information about past ice-sheet changes in areas where other archives such as rock outcrops are missing. Here we present an improved modelling framework to study ice-rise evolution using a satellite-velocity calibrated, isothermal, and isotropic 3-D full-Stokes model including grounding-line dynamics at the required mesh resolution (<500 m). This overcomes limitations of previous studies where ice-rise modelling has been restricted to 2-D and excluded the coupling between the ice shelf and ice rise. We apply the model to the Ekström Ice Shelf, Antarctica, containing two ice rises. Our simulations investigate the effect of surface mass balance and ocean perturbations onto ice-rise divide position and interpret possible resulting unique Raymond arch geometries. Our results show that changes in the surface mass balance result in immediate and sustained divide migration (>2.0 m yr−1) of up to 3.5 km. In contrast, instantaneous ice-shelf disintegration causes a short-lived and delayed (by 60–100 years) response of smaller magnitude (<0.75 m yr−1). The model tracks migration of a triple junction and synchronous ice-divide migration in both ice rises with similar magnitude but differing rates. The model is suitable for glacial/interglacial simulations on the catchment scale, providing the next step forward to unravel the ice-dynamic history stored in ice rises all around Antarctica. Article in Journal/Newspaper Antarc* Antarctic Antarctica Ice Sheet Ice Shelf Ice Shelves The Cryosphere Université de Nantes: HAL-UNIV-NANTES Antarctic Ekström Ice Shelf ENVELOPE(-8.000,-8.000,-71.000,-71.000) The Cryosphere 13 10 2673 2691 |
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Open Polar |
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Université de Nantes: HAL-UNIV-NANTES |
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ftunivnantes |
language |
English |
topic |
[SDE]Environmental Sciences |
spellingShingle |
[SDE]Environmental Sciences Schannwell, Clemens Drews, Reinhard Ehlers, Todd Eisen, Olaf Mayer, Christoph Gillet-Chaulet, F Kinematic response of ice-rise divides to changes in ocean and atmosphere forcing |
topic_facet |
[SDE]Environmental Sciences |
description |
International audience The majority of Antarctic ice shelves are bounded by grounded ice rises. These ice rises exhibit local flow fields that partially oppose the flow of the surrounding ice shelves. Formation of ice rises is accompanied by a characteristic upward-arching internal stratigraphy (“Raymond arches”), whose geometry can be analysed to infer information about past ice-sheet changes in areas where other archives such as rock outcrops are missing. Here we present an improved modelling framework to study ice-rise evolution using a satellite-velocity calibrated, isothermal, and isotropic 3-D full-Stokes model including grounding-line dynamics at the required mesh resolution (<500 m). This overcomes limitations of previous studies where ice-rise modelling has been restricted to 2-D and excluded the coupling between the ice shelf and ice rise. We apply the model to the Ekström Ice Shelf, Antarctica, containing two ice rises. Our simulations investigate the effect of surface mass balance and ocean perturbations onto ice-rise divide position and interpret possible resulting unique Raymond arch geometries. Our results show that changes in the surface mass balance result in immediate and sustained divide migration (>2.0 m yr−1) of up to 3.5 km. In contrast, instantaneous ice-shelf disintegration causes a short-lived and delayed (by 60–100 years) response of smaller magnitude (<0.75 m yr−1). The model tracks migration of a triple junction and synchronous ice-divide migration in both ice rises with similar magnitude but differing rates. The model is suitable for glacial/interglacial simulations on the catchment scale, providing the next step forward to unravel the ice-dynamic history stored in ice rises all around Antarctica. |
author2 |
Institut des Géosciences de l’Environnement (IGE) Institut de Recherche pour le Développement (IRD)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes 2016-2019 (UGA 2016-2019 ) |
format |
Article in Journal/Newspaper |
author |
Schannwell, Clemens Drews, Reinhard Ehlers, Todd Eisen, Olaf Mayer, Christoph Gillet-Chaulet, F |
author_facet |
Schannwell, Clemens Drews, Reinhard Ehlers, Todd Eisen, Olaf Mayer, Christoph Gillet-Chaulet, F |
author_sort |
Schannwell, Clemens |
title |
Kinematic response of ice-rise divides to changes in ocean and atmosphere forcing |
title_short |
Kinematic response of ice-rise divides to changes in ocean and atmosphere forcing |
title_full |
Kinematic response of ice-rise divides to changes in ocean and atmosphere forcing |
title_fullStr |
Kinematic response of ice-rise divides to changes in ocean and atmosphere forcing |
title_full_unstemmed |
Kinematic response of ice-rise divides to changes in ocean and atmosphere forcing |
title_sort |
kinematic response of ice-rise divides to changes in ocean and atmosphere forcing |
publisher |
HAL CCSD |
publishDate |
2019 |
url |
https://hal.science/hal-03031569 https://hal.science/hal-03031569/document https://hal.science/hal-03031569/file/Schannwell%20et%20al.%20-%202019%20-%20Kinematic%20response%20of%20ice-rise%20divides%20to%20changes%20.pdf https://doi.org/10.5194/tc-13-2673-2019 |
long_lat |
ENVELOPE(-8.000,-8.000,-71.000,-71.000) |
geographic |
Antarctic Ekström Ice Shelf |
geographic_facet |
Antarctic Ekström Ice Shelf |
genre |
Antarc* Antarctic Antarctica Ice Sheet Ice Shelf Ice Shelves The Cryosphere |
genre_facet |
Antarc* Antarctic Antarctica Ice Sheet Ice Shelf Ice Shelves The Cryosphere |
op_source |
ISSN: 1994-0424 EISSN: 1994-0416 The Cryosphere https://hal.science/hal-03031569 The Cryosphere, 2019, 13 (10), pp.2673-2691. ⟨10.5194/tc-13-2673-2019⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/tc-13-2673-2019 hal-03031569 https://hal.science/hal-03031569 https://hal.science/hal-03031569/document https://hal.science/hal-03031569/file/Schannwell%20et%20al.%20-%202019%20-%20Kinematic%20response%20of%20ice-rise%20divides%20to%20changes%20.pdf doi:10.5194/tc-13-2673-2019 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.5194/tc-13-2673-2019 |
container_title |
The Cryosphere |
container_volume |
13 |
container_issue |
10 |
container_start_page |
2673 |
op_container_end_page |
2691 |
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1766188517223825408 |