Impact of ice-shelf basal melting on inland ice-sheet thickness: a model study
Ice flow from the ice sheets to the ocean contains the maximum potential contributing to future eustatic sea level rise. In Antarctica most of the mass fluxes occur via the extended ice shelf regions, covering more than one half of the Antarctic coast line. The most extended ice shelves are the Filc...
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Online Access: | https://epic.awi.de/id/eprint/25991/ https://epic.awi.de/id/eprint/25991/1/Annals5360a170.pdf https://hdl.handle.net/10013/epic.38937 https://hdl.handle.net/10013/epic.38937.d001 |
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ftawi:oai:epic.awi.de:25991 2023-05-15T13:29:47+02:00 Impact of ice-shelf basal melting on inland ice-sheet thickness: a model study Determann, Jürgen Thoma, Malte Grosfeld, Klaus Maßmann, Silvia 2012 application/pdf https://epic.awi.de/id/eprint/25991/ https://epic.awi.de/id/eprint/25991/1/Annals5360a170.pdf https://hdl.handle.net/10013/epic.38937 https://hdl.handle.net/10013/epic.38937.d001 unknown INT GLACIOL SOC https://epic.awi.de/id/eprint/25991/1/Annals5360a170.pdf https://hdl.handle.net/10013/epic.38937.d001 Determann, J. , Thoma, M. orcid:0000-0002-4033-3905 , Grosfeld, K. orcid:0000-0001-5936-179X and Maßmann, S. (2012) Impact of ice-shelf basal melting on inland ice-sheet thickness: a model study , Annals of Glaciology, 53 (60), pp. 129-135 . doi:10.3189/2012AoG60A170 <https://doi.org/10.3189/2012AoG60A170> , hdl:10013/epic.38937 EPIC3Annals of Glaciology, INT GLACIOL SOC, 53(60), pp. 129-135, ISSN: 0260-3055 Article isiRev 2012 ftawi https://doi.org/10.3189/2012AoG60A170 2021-12-24T15:35:36Z Ice flow from the ice sheets to the ocean contains the maximum potential contributing to future eustatic sea level rise. In Antarctica most of the mass fluxes occur via the extended ice shelf regions, covering more than one half of the Antarctic coast line. The most extended ice shelves are the Filchner-Ronne and Ross ice shelves, contributing about 30% to the total mass loss caused by basal melting. Basal melt rates show here small to moderate amplitudes of lower than 0.5 m/a on average. In comparison, the smaller but most vulnerable ice shelves in the Amundsen and Bellingshausen Seas show much higher melt rates (up to 30 ma-1) but overall basal mass loss is comparably small due to the small size of the ice shelves. The pivotal question for both characteristic ice shelf regions, however, is the impact of ocean melting and coevally change in ice-shelf thickness on the flow dynamics of the hinterland ice masses. In theory, ice-shelf back-pressure acts to stabilize the ice sheet, and thus the ice volume stored above sea level. We use the three-dimensional thermomechanical ice flow model RIMBAY to investigate the ice flow in a regularly shaped model domain, including ice sheet, ice shelf, and open-ocean regions. By using melting scenarios for perturbation studies, we find a hysteresis-like behaviour. The experiments show that the system reattains initial state when perturbations are switched off. Average basal melt rates of up to 2 ma-1 as well as spatially variable melting calculated by our 3d ocean model ROMBAX act as basal boundary conditions in time-dependent model studies. Changes in ice volume and grounding-line position are monitored after 1000 years of modelling and reveal mass losses of up to 40 Gta-1. Article in Journal/Newspaper Annals of Glaciology Antarc* Antarctic Antarctica Ice Sheet Ice Shelf Ice Shelves Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Antarctic The Antarctic Annals of Glaciology 53 60 129 135 |
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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 |
Ice flow from the ice sheets to the ocean contains the maximum potential contributing to future eustatic sea level rise. In Antarctica most of the mass fluxes occur via the extended ice shelf regions, covering more than one half of the Antarctic coast line. The most extended ice shelves are the Filchner-Ronne and Ross ice shelves, contributing about 30% to the total mass loss caused by basal melting. Basal melt rates show here small to moderate amplitudes of lower than 0.5 m/a on average. In comparison, the smaller but most vulnerable ice shelves in the Amundsen and Bellingshausen Seas show much higher melt rates (up to 30 ma-1) but overall basal mass loss is comparably small due to the small size of the ice shelves. The pivotal question for both characteristic ice shelf regions, however, is the impact of ocean melting and coevally change in ice-shelf thickness on the flow dynamics of the hinterland ice masses. In theory, ice-shelf back-pressure acts to stabilize the ice sheet, and thus the ice volume stored above sea level. We use the three-dimensional thermomechanical ice flow model RIMBAY to investigate the ice flow in a regularly shaped model domain, including ice sheet, ice shelf, and open-ocean regions. By using melting scenarios for perturbation studies, we find a hysteresis-like behaviour. The experiments show that the system reattains initial state when perturbations are switched off. Average basal melt rates of up to 2 ma-1 as well as spatially variable melting calculated by our 3d ocean model ROMBAX act as basal boundary conditions in time-dependent model studies. Changes in ice volume and grounding-line position are monitored after 1000 years of modelling and reveal mass losses of up to 40 Gta-1. |
format |
Article in Journal/Newspaper |
author |
Determann, Jürgen Thoma, Malte Grosfeld, Klaus Maßmann, Silvia |
spellingShingle |
Determann, Jürgen Thoma, Malte Grosfeld, Klaus Maßmann, Silvia Impact of ice-shelf basal melting on inland ice-sheet thickness: a model study |
author_facet |
Determann, Jürgen Thoma, Malte Grosfeld, Klaus Maßmann, Silvia |
author_sort |
Determann, Jürgen |
title |
Impact of ice-shelf basal melting on inland ice-sheet thickness: a model study |
title_short |
Impact of ice-shelf basal melting on inland ice-sheet thickness: a model study |
title_full |
Impact of ice-shelf basal melting on inland ice-sheet thickness: a model study |
title_fullStr |
Impact of ice-shelf basal melting on inland ice-sheet thickness: a model study |
title_full_unstemmed |
Impact of ice-shelf basal melting on inland ice-sheet thickness: a model study |
title_sort |
impact of ice-shelf basal melting on inland ice-sheet thickness: a model study |
publisher |
INT GLACIOL SOC |
publishDate |
2012 |
url |
https://epic.awi.de/id/eprint/25991/ https://epic.awi.de/id/eprint/25991/1/Annals5360a170.pdf https://hdl.handle.net/10013/epic.38937 https://hdl.handle.net/10013/epic.38937.d001 |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Annals of Glaciology Antarc* Antarctic Antarctica Ice Sheet Ice Shelf Ice Shelves |
genre_facet |
Annals of Glaciology Antarc* Antarctic Antarctica Ice Sheet Ice Shelf Ice Shelves |
op_source |
EPIC3Annals of Glaciology, INT GLACIOL SOC, 53(60), pp. 129-135, ISSN: 0260-3055 |
op_relation |
https://epic.awi.de/id/eprint/25991/1/Annals5360a170.pdf https://hdl.handle.net/10013/epic.38937.d001 Determann, J. , Thoma, M. orcid:0000-0002-4033-3905 , Grosfeld, K. orcid:0000-0001-5936-179X and Maßmann, S. (2012) Impact of ice-shelf basal melting on inland ice-sheet thickness: a model study , Annals of Glaciology, 53 (60), pp. 129-135 . doi:10.3189/2012AoG60A170 <https://doi.org/10.3189/2012AoG60A170> , hdl:10013/epic.38937 |
op_doi |
https://doi.org/10.3189/2012AoG60A170 |
container_title |
Annals of Glaciology |
container_volume |
53 |
container_issue |
60 |
container_start_page |
129 |
op_container_end_page |
135 |
_version_ |
1766003132523872256 |