Kinematic response of ice-rise divides to changes in ocean and atmosphere forcing
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 g...
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ftawi:oai:epic.awi.de:50398 2023-05-15T13:45:21+02:00 Kinematic response of ice-rise divides to changes in ocean and atmosphere forcing Schannwell, Clemens Drews, Reinhard Ehlers, Todd A. Eisen, Olaf Mayer, Christoph Gillet-Chaulet, Fabien 2019-10-13 https://epic.awi.de/id/eprint/50398/ https://doi.org/10.5194/tc-13-2673-2019 https://hdl.handle.net/10013/epic.b3d52a24-da6b-41d4-bacd-35bf8cf914bb unknown Schannwell, C. , Drews, R. , Ehlers, T. A. , Eisen, O. orcid:0000-0002-6380-962X , Mayer, C. and Gillet-Chaulet, F. (2019) Kinematic response of ice-rise divides to changes in ocean and atmosphere forcing , The Cryosphere, 13 (10), pp. 2673-2691 . doi:10.5194/tc-13-2673-2019 <https://doi.org/10.5194/tc-13-2673-2019> , hdl:10013/epic.b3d52a24-da6b-41d4-bacd-35bf8cf914bb EPIC3The Cryosphere, 13(10), pp. 2673-2691, ISSN: 1994-0424 Article isiRev 2019 ftawi https://doi.org/10.5194/tc-13-2673-2019 2021-12-24T15:44:58Z 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 Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Antarctic Ekström Ice Shelf ENVELOPE(-8.000,-8.000,-71.000,-71.000) The Cryosphere 13 10 2673 2691 |
institution |
Open Polar |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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ftawi |
language |
unknown |
description |
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. |
format |
Article in Journal/Newspaper |
author |
Schannwell, Clemens Drews, Reinhard Ehlers, Todd A. Eisen, Olaf Mayer, Christoph Gillet-Chaulet, Fabien |
spellingShingle |
Schannwell, Clemens Drews, Reinhard Ehlers, Todd A. Eisen, Olaf Mayer, Christoph Gillet-Chaulet, Fabien Kinematic response of ice-rise divides to changes in ocean and atmosphere forcing |
author_facet |
Schannwell, Clemens Drews, Reinhard Ehlers, Todd A. Eisen, Olaf Mayer, Christoph Gillet-Chaulet, Fabien |
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 |
publishDate |
2019 |
url |
https://epic.awi.de/id/eprint/50398/ https://doi.org/10.5194/tc-13-2673-2019 https://hdl.handle.net/10013/epic.b3d52a24-da6b-41d4-bacd-35bf8cf914bb |
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 |
EPIC3The Cryosphere, 13(10), pp. 2673-2691, ISSN: 1994-0424 |
op_relation |
Schannwell, C. , Drews, R. , Ehlers, T. A. , Eisen, O. orcid:0000-0002-6380-962X , Mayer, C. and Gillet-Chaulet, F. (2019) Kinematic response of ice-rise divides to changes in ocean and atmosphere forcing , The Cryosphere, 13 (10), pp. 2673-2691 . doi:10.5194/tc-13-2673-2019 <https://doi.org/10.5194/tc-13-2673-2019> , hdl:10013/epic.b3d52a24-da6b-41d4-bacd-35bf8cf914bb |
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 |
_version_ |
1766221773787889664 |