Sensitivity of ice flow 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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ftpotsdamik:oai:publications.pik-potsdam.de:item_24758 2023-10-29T02:32:25+01:00 Sensitivity of ice flow to uncertainty in flow law parameters in an idealized one-dimensional geometry Zeitz, M. Levermann, A. Winkelmann, R. 2020-11-15 application/pdf https://publications.pik-potsdam.de/pubman/item/item_24758 https://publications.pik-potsdam.de/pubman/item/item_24758_1/component/file_24805/24758oa.pdf unknown info:eu-repo/semantics/altIdentifier/doi/10.5194/tc-14-3537-2020 https://publications.pik-potsdam.de/pubman/item/item_24758 https://publications.pik-potsdam.de/pubman/item/item_24758_1/component/file_24805/24758oa.pdf info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/4.0/ The Cryosphere info:eu-repo/semantics/article 2020 ftpotsdamik https://doi.org/10.5194/tc-14-3537-2020 2023-09-30T17:59:47Z 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 The Cryosphere Publication Database PIK (Potsdam Institute for Climate Impact Research) The Cryosphere 14 10 3537 3550 |
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Open Polar |
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Publication Database PIK (Potsdam Institute for Climate Impact Research) |
op_collection_id |
ftpotsdamik |
language |
unknown |
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, M. Levermann, A. Winkelmann, R. |
spellingShingle |
Zeitz, M. Levermann, A. Winkelmann, R. Sensitivity of ice flow to uncertainty in flow law parameters in an idealized one-dimensional geometry |
author_facet |
Zeitz, M. Levermann, A. Winkelmann, R. |
author_sort |
Zeitz, M. |
title |
Sensitivity of ice flow to uncertainty in flow law parameters in an idealized one-dimensional geometry |
title_short |
Sensitivity of ice flow to uncertainty in flow law parameters in an idealized one-dimensional geometry |
title_full |
Sensitivity of ice flow to uncertainty in flow law parameters in an idealized one-dimensional geometry |
title_fullStr |
Sensitivity of ice flow to uncertainty in flow law parameters in an idealized one-dimensional geometry |
title_full_unstemmed |
Sensitivity of ice flow to uncertainty in flow law parameters in an idealized one-dimensional geometry |
title_sort |
sensitivity of ice flow to uncertainty in flow law parameters in an idealized one-dimensional geometry |
publishDate |
2020 |
url |
https://publications.pik-potsdam.de/pubman/item/item_24758 https://publications.pik-potsdam.de/pubman/item/item_24758_1/component/file_24805/24758oa.pdf |
genre |
Antarc* Antarctic Antarctica Greenland Ice Sheet The Cryosphere |
genre_facet |
Antarc* Antarctic Antarctica Greenland Ice Sheet The Cryosphere |
op_source |
The Cryosphere |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/tc-14-3537-2020 https://publications.pik-potsdam.de/pubman/item/item_24758 https://publications.pik-potsdam.de/pubman/item/item_24758_1/component/file_24805/24758oa.pdf |
op_rights |
info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.5194/tc-14-3537-2020 |
container_title |
The Cryosphere |
container_volume |
14 |
container_issue |
10 |
container_start_page |
3537 |
op_container_end_page |
3550 |
_version_ |
1781053831728070656 |