Sensitivity of ice loss to uncertainty in flow law parameters in an idealized one-dimensional geometry
Acceleration of the flow of ice drives mass losses in both the Antarctic and the Greenland Ice Sheet. The projections of possible future sea-level rise rely on numerical ice-sheet models, which solve the physics of ice flow, melt, and calving. While major advancements have been made by the ice-sheet...
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fttibhannoverren:oai:oa.tib.eu:123456789/8512 2023-07-30T03:57:58+02:00 Sensitivity of ice loss to uncertainty in flow law parameters in an idealized one-dimensional geometry Zeitz, Maria Levermann, Anders Winkelmann, Ricarda 2021 application/pdf https://oa.tib.eu/renate/handle/123456789/8512 https://doi.org/10.34657/7550 eng eng Katlenburg-Lindau : Copernicus ESSN:1994-0424 DOI:https://doi.org/10.5194/tc-14-3537-2020 https://oa.tib.eu/renate/handle/123456789/8512 https://doi.org/10.34657/7550 CC BY 4.0 Unported https://creativecommons.org/licenses/by/4.0/ frei zugänglich Cryosphere 14 (2021), Nr. 10 ddc:910 status-type:publishedVersion doc-type:article doc-type:Text 2021 fttibhannoverren https://doi.org/10.34657/755010.5194/tc-14-3537-2020 2023-07-10T16:19:17Z Acceleration of the flow of ice drives mass losses in both the Antarctic and the Greenland Ice Sheet. The projections of possible future sea-level rise rely on numerical ice-sheet models, which solve the physics of ice flow, melt, and calving. While major advancements have been made by the ice-sheet modeling community in addressing several of the related uncertainties, the flow law, which is at the center of most process-based ice-sheet models, is not in the focus of the current scientific debate. However, recent studies show that the flow law parameters are highly uncertain and might be different from the widely accepted standard values. Here, we use an idealized flow-line setup to investigate how these uncertainties in the flow law translate into uncertainties in flow-driven mass loss. In order to disentangle the effect of future warming on the ice flow from other effects, we perform a suite of experiments with the Parallel Ice Sheet Model (PISM), deliberately excluding changes in the surface mass balance. We find that changes in the flow parameters within the observed range can lead up to a doubling of the flow-driven mass loss within the first centuries of warming, compared to standard parameters. The spread of ice loss due to the uncertainty in flow parameters is on the same order of magnitude as the increase in mass loss due to surface warming. While this study focuses on an idealized flow-line geometry, it is likely that this uncertainty carries over to realistic three-dimensional simulations of Greenland and Antarctica. Article in Journal/Newspaper Antarc* Antarctic Antarctica Greenland Ice Sheet Renate - Repositorium für Naturwissenschaften und Technik (TIB Hannover) Antarctic The Antarctic Greenland |
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Renate - Repositorium für Naturwissenschaften und Technik (TIB Hannover) |
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fttibhannoverren |
language |
English |
topic |
ddc:910 |
spellingShingle |
ddc:910 Zeitz, Maria Levermann, Anders Winkelmann, Ricarda Sensitivity of ice loss to uncertainty in flow law parameters in an idealized one-dimensional geometry |
topic_facet |
ddc:910 |
description |
Acceleration of the flow of ice drives mass losses in both the Antarctic and the Greenland Ice Sheet. The projections of possible future sea-level rise rely on numerical ice-sheet models, which solve the physics of ice flow, melt, and calving. While major advancements have been made by the ice-sheet modeling community in addressing several of the related uncertainties, the flow law, which is at the center of most process-based ice-sheet models, is not in the focus of the current scientific debate. However, recent studies show that the flow law parameters are highly uncertain and might be different from the widely accepted standard values. Here, we use an idealized flow-line setup to investigate how these uncertainties in the flow law translate into uncertainties in flow-driven mass loss. In order to disentangle the effect of future warming on the ice flow from other effects, we perform a suite of experiments with the Parallel Ice Sheet Model (PISM), deliberately excluding changes in the surface mass balance. We find that changes in the flow parameters within the observed range can lead up to a doubling of the flow-driven mass loss within the first centuries of warming, compared to standard parameters. The spread of ice loss due to the uncertainty in flow parameters is on the same order of magnitude as the increase in mass loss due to surface warming. While this study focuses on an idealized flow-line geometry, it is likely that this uncertainty carries over to realistic three-dimensional simulations of Greenland and Antarctica. |
format |
Article in Journal/Newspaper |
author |
Zeitz, Maria Levermann, Anders Winkelmann, Ricarda |
author_facet |
Zeitz, Maria Levermann, Anders Winkelmann, Ricarda |
author_sort |
Zeitz, Maria |
title |
Sensitivity of ice loss to uncertainty in flow law parameters in an idealized one-dimensional geometry |
title_short |
Sensitivity of ice loss to uncertainty in flow law parameters in an idealized one-dimensional geometry |
title_full |
Sensitivity of ice loss to uncertainty in flow law parameters in an idealized one-dimensional geometry |
title_fullStr |
Sensitivity of ice loss to uncertainty in flow law parameters in an idealized one-dimensional geometry |
title_full_unstemmed |
Sensitivity of ice loss to uncertainty in flow law parameters in an idealized one-dimensional geometry |
title_sort |
sensitivity of ice loss to uncertainty in flow law parameters in an idealized one-dimensional geometry |
publisher |
Katlenburg-Lindau : Copernicus |
publishDate |
2021 |
url |
https://oa.tib.eu/renate/handle/123456789/8512 https://doi.org/10.34657/7550 |
geographic |
Antarctic The Antarctic Greenland |
geographic_facet |
Antarctic The Antarctic Greenland |
genre |
Antarc* Antarctic Antarctica Greenland Ice Sheet |
genre_facet |
Antarc* Antarctic Antarctica Greenland Ice Sheet |
op_source |
Cryosphere 14 (2021), Nr. 10 |
op_relation |
ESSN:1994-0424 DOI:https://doi.org/10.5194/tc-14-3537-2020 https://oa.tib.eu/renate/handle/123456789/8512 https://doi.org/10.34657/7550 |
op_rights |
CC BY 4.0 Unported https://creativecommons.org/licenses/by/4.0/ frei zugänglich |
op_doi |
https://doi.org/10.34657/755010.5194/tc-14-3537-2020 |
_version_ |
1772820541643685888 |