Marine ice sheet experiments with the Community Ice Sheet Model
ATM0856145 1852977 Ice sheet models differ in their numerical treatment of dynamical processes. Simulations of marine-based ice are sensitive to the choice of Stokes flow approximation and basal friction law and to the treatment of stresses and melt rates near the grounding line. We study the effect...
Published in: | The Cryosphere |
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Language: | English |
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Online Access: | https://doi.org/10.5194/tc-15-3229-2021 |
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ftncar:oai:drupal-site.org:articles_24540 2024-04-14T08:13:08+00:00 Marine ice sheet experiments with the Community Ice Sheet Model Leguy, Gunter R. (author) Lipscomb, William H. (author) Asay-Davis, Xylar S. (author) 2021-07-14 https://doi.org/10.5194/tc-15-3229-2021 en eng The Cryosphere--The Cryosphere--1994-0424 Marine Ice Sheet Experiments CISM 2021--10.5065/k3ws-2435 ESCOMP/CISM: CISM grounding line and basal melt parameterization--10.5281/zenodo.4784788 articles:24540 doi:10.5194/tc-15-3229-2021 ark:/85065/d7x351wh Copyright author(s). This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License. article Text 2021 ftncar https://doi.org/10.5194/tc-15-3229-2021 2024-03-21T18:00:26Z ATM0856145 1852977 Ice sheet models differ in their numerical treatment of dynamical processes. Simulations of marine-based ice are sensitive to the choice of Stokes flow approximation and basal friction law and to the treatment of stresses and melt rates near the grounding line. We study the effects of these numerical choices on marine ice sheet dynamics in the Community Ice Sheet Model (CISM). In the framework of the Marine Ice Sheet Model Intercomparison Project 3d (MISMIP3d), we show that a depth-integrated, higher-order solver gives results similar to a 3D (Blatter–Pattyn) solver. We confirm that using a grounding line parameterization to approximate stresses in the grounding zone leads to accurate representation of ice sheet flow with a resolution of ∼2 km, as opposed to ∼0.5 km without the parameterization. In the MISMIP+ experimental framework, we compare different treatments of sub-shelf melting near the grounding line. In contrast to recent studies arguing that melting should not be applied in partly grounded cells, it is usually beneficial in CISM simulations to apply some melting in these cells. This suggests that the optimal treatment of melting near the grounding line can depend on ice sheet geometry, forcing, or model numerics. In both experimental frameworks, ice flow is sensitive to the choice of basal friction law. To study this sensitivity, we evaluate friction laws that vary the connectivity between the basal hydrological system and the ocean near the grounding line. CISM yields accurate results in steady-state and perturbation experiments at a resolution of ∼2 km (arguably 4 km) when the connectivity is low or moderate and ∼1 km (arguably 2 km) when the connectivity is strong. Article in Journal/Newspaper Ice Sheet The Cryosphere OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) The Cryosphere 15 7 3229 3253 |
institution |
Open Polar |
collection |
OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) |
op_collection_id |
ftncar |
language |
English |
description |
ATM0856145 1852977 Ice sheet models differ in their numerical treatment of dynamical processes. Simulations of marine-based ice are sensitive to the choice of Stokes flow approximation and basal friction law and to the treatment of stresses and melt rates near the grounding line. We study the effects of these numerical choices on marine ice sheet dynamics in the Community Ice Sheet Model (CISM). In the framework of the Marine Ice Sheet Model Intercomparison Project 3d (MISMIP3d), we show that a depth-integrated, higher-order solver gives results similar to a 3D (Blatter–Pattyn) solver. We confirm that using a grounding line parameterization to approximate stresses in the grounding zone leads to accurate representation of ice sheet flow with a resolution of ∼2 km, as opposed to ∼0.5 km without the parameterization. In the MISMIP+ experimental framework, we compare different treatments of sub-shelf melting near the grounding line. In contrast to recent studies arguing that melting should not be applied in partly grounded cells, it is usually beneficial in CISM simulations to apply some melting in these cells. This suggests that the optimal treatment of melting near the grounding line can depend on ice sheet geometry, forcing, or model numerics. In both experimental frameworks, ice flow is sensitive to the choice of basal friction law. To study this sensitivity, we evaluate friction laws that vary the connectivity between the basal hydrological system and the ocean near the grounding line. CISM yields accurate results in steady-state and perturbation experiments at a resolution of ∼2 km (arguably 4 km) when the connectivity is low or moderate and ∼1 km (arguably 2 km) when the connectivity is strong. |
author2 |
Leguy, Gunter R. (author) Lipscomb, William H. (author) Asay-Davis, Xylar S. (author) |
format |
Article in Journal/Newspaper |
title |
Marine ice sheet experiments with the Community Ice Sheet Model |
spellingShingle |
Marine ice sheet experiments with the Community Ice Sheet Model |
title_short |
Marine ice sheet experiments with the Community Ice Sheet Model |
title_full |
Marine ice sheet experiments with the Community Ice Sheet Model |
title_fullStr |
Marine ice sheet experiments with the Community Ice Sheet Model |
title_full_unstemmed |
Marine ice sheet experiments with the Community Ice Sheet Model |
title_sort |
marine ice sheet experiments with the community ice sheet model |
publishDate |
2021 |
url |
https://doi.org/10.5194/tc-15-3229-2021 |
genre |
Ice Sheet The Cryosphere |
genre_facet |
Ice Sheet The Cryosphere |
op_relation |
The Cryosphere--The Cryosphere--1994-0424 Marine Ice Sheet Experiments CISM 2021--10.5065/k3ws-2435 ESCOMP/CISM: CISM grounding line and basal melt parameterization--10.5281/zenodo.4784788 articles:24540 doi:10.5194/tc-15-3229-2021 ark:/85065/d7x351wh |
op_rights |
Copyright author(s). This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License. |
op_doi |
https://doi.org/10.5194/tc-15-3229-2021 |
container_title |
The Cryosphere |
container_volume |
15 |
container_issue |
7 |
container_start_page |
3229 |
op_container_end_page |
3253 |
_version_ |
1796311058529386496 |