Projected sea-level contributions from tidewater glaciers are highly sensitive to chosen bedrock topography: a case study at Hansbreen, Svalbard
Calculation of the calving loss of tidewater glaciers depends on accurate bedrock information. In regional to global-scale projections of future tidewater glacier evolution this dependence is problematic. Bedrock topographies are often unknown and can only be modelled from surface properties. Existi...
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ftethz:oai:www.research-collection.ethz.ch:20.500.11850/596864 2023-10-01T03:54:10+02:00 Projected sea-level contributions from tidewater glaciers are highly sensitive to chosen bedrock topography: a case study at Hansbreen, Svalbard Möller, Marco Navarro, Francisco Huss, Matthias id_orcid:0 000-0002-2377-6923 Marzeion, Ben 2023-08 application/application/pdf https://hdl.handle.net/20.500.11850/596864 https://doi.org/10.3929/ethz-b-000596864 en eng Cambridge University Press info:eu-repo/semantics/altIdentifier/doi/10.1017/jog.2022.117 info:eu-repo/semantics/altIdentifier/wos/000914199600001 http://hdl.handle.net/20.500.11850/596864 doi:10.3929/ethz-b-000596864 info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International Journal of Glaciology, 69 (276) Arctic glaciology glacier calving glacier fluctuations glacier modelling info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2023 ftethz https://doi.org/20.500.11850/59686410.3929/ethz-b-00059686410.1017/jog.2022.117 2023-09-03T23:49:57Z Calculation of the calving loss of tidewater glaciers depends on accurate bedrock information. In regional to global-scale projections of future tidewater glacier evolution this dependence is problematic. Bedrock topographies are often unknown and can only be modelled from surface properties. Existing approaches, however, mostly underestimate the ice thickness towards the calving fronts of marine-terminating glaciers. This implies a compromised performance of global-scale projection models which often employ functions of water depth at the calving fronts of tidewater glaciers. Here, we present a sensitivity study that analyses the impact of five different bedrock datasets on projected mass losses from the tidewater glacier Hansbreen in southern Svalbard. Our modelling study calculates the glacier's response to artificial mass-balance forcing. We show that bedrock inaccuracies may lead to a substantially deviating retreat behaviour. The common underestimation of frontal ice thickness/water depth in the modelled bedrock datasets induces an underestimation of sea level-relevant mass losses over the first several decades of modelling. The duration of this period is reduced when assuming warmer climates. Our results thus underline the importance of accurate bedrock topography data for the reliability of glacier evolution projections and for the accuracy of the temporal trajectories of related sea level-relevant mass losses. ISSN:0022-1430 ISSN:1727-5652 Article in Journal/Newspaper Arctic glacier Journal of Glaciology Svalbard Tidewater ETH Zürich Research Collection Arctic Hansbreen ENVELOPE(15.650,15.650,77.075,77.075) Svalbard |
institution |
Open Polar |
collection |
ETH Zürich Research Collection |
op_collection_id |
ftethz |
language |
English |
topic |
Arctic glaciology glacier calving glacier fluctuations glacier modelling |
spellingShingle |
Arctic glaciology glacier calving glacier fluctuations glacier modelling Möller, Marco Navarro, Francisco Huss, Matthias id_orcid:0 000-0002-2377-6923 Marzeion, Ben Projected sea-level contributions from tidewater glaciers are highly sensitive to chosen bedrock topography: a case study at Hansbreen, Svalbard |
topic_facet |
Arctic glaciology glacier calving glacier fluctuations glacier modelling |
description |
Calculation of the calving loss of tidewater glaciers depends on accurate bedrock information. In regional to global-scale projections of future tidewater glacier evolution this dependence is problematic. Bedrock topographies are often unknown and can only be modelled from surface properties. Existing approaches, however, mostly underestimate the ice thickness towards the calving fronts of marine-terminating glaciers. This implies a compromised performance of global-scale projection models which often employ functions of water depth at the calving fronts of tidewater glaciers. Here, we present a sensitivity study that analyses the impact of five different bedrock datasets on projected mass losses from the tidewater glacier Hansbreen in southern Svalbard. Our modelling study calculates the glacier's response to artificial mass-balance forcing. We show that bedrock inaccuracies may lead to a substantially deviating retreat behaviour. The common underestimation of frontal ice thickness/water depth in the modelled bedrock datasets induces an underestimation of sea level-relevant mass losses over the first several decades of modelling. The duration of this period is reduced when assuming warmer climates. Our results thus underline the importance of accurate bedrock topography data for the reliability of glacier evolution projections and for the accuracy of the temporal trajectories of related sea level-relevant mass losses. ISSN:0022-1430 ISSN:1727-5652 |
format |
Article in Journal/Newspaper |
author |
Möller, Marco Navarro, Francisco Huss, Matthias id_orcid:0 000-0002-2377-6923 Marzeion, Ben |
author_facet |
Möller, Marco Navarro, Francisco Huss, Matthias id_orcid:0 000-0002-2377-6923 Marzeion, Ben |
author_sort |
Möller, Marco |
title |
Projected sea-level contributions from tidewater glaciers are highly sensitive to chosen bedrock topography: a case study at Hansbreen, Svalbard |
title_short |
Projected sea-level contributions from tidewater glaciers are highly sensitive to chosen bedrock topography: a case study at Hansbreen, Svalbard |
title_full |
Projected sea-level contributions from tidewater glaciers are highly sensitive to chosen bedrock topography: a case study at Hansbreen, Svalbard |
title_fullStr |
Projected sea-level contributions from tidewater glaciers are highly sensitive to chosen bedrock topography: a case study at Hansbreen, Svalbard |
title_full_unstemmed |
Projected sea-level contributions from tidewater glaciers are highly sensitive to chosen bedrock topography: a case study at Hansbreen, Svalbard |
title_sort |
projected sea-level contributions from tidewater glaciers are highly sensitive to chosen bedrock topography: a case study at hansbreen, svalbard |
publisher |
Cambridge University Press |
publishDate |
2023 |
url |
https://hdl.handle.net/20.500.11850/596864 https://doi.org/10.3929/ethz-b-000596864 |
long_lat |
ENVELOPE(15.650,15.650,77.075,77.075) |
geographic |
Arctic Hansbreen Svalbard |
geographic_facet |
Arctic Hansbreen Svalbard |
genre |
Arctic glacier Journal of Glaciology Svalbard Tidewater |
genre_facet |
Arctic glacier Journal of Glaciology Svalbard Tidewater |
op_source |
Journal of Glaciology, 69 (276) |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1017/jog.2022.117 info:eu-repo/semantics/altIdentifier/wos/000914199600001 http://hdl.handle.net/20.500.11850/596864 doi:10.3929/ethz-b-000596864 |
op_rights |
info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International |
op_doi |
https://doi.org/20.500.11850/59686410.3929/ethz-b-00059686410.1017/jog.2022.117 |
_version_ |
1778521555685343232 |