Toward a method for downscaling sea ice pressure for navigation purposes
Sea ice pressure poses great risk for navigation; it can lead to ship besetting and damages. Contemporary large-scale sea ice forecasting systems can predict the evolution of sea ice pressure. There is, however, a mismatch between the spatial resolution of these systems (a few kilometres) and the ty...
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Copernicus Publications
2020
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00054345 2023-05-15T18:16:18+02:00 Toward a method for downscaling sea ice pressure for navigation purposes Lemieux, Jean-François Tremblay, L. Bruno Plante, Mathieu 2020-10 electronic https://doi.org/10.5194/tc-14-3465-2020 https://noa.gwlb.de/receive/cop_mods_00054345 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00053996/tc-14-3465-2020.pdf https://tc.copernicus.org/articles/14/3465/2020/tc-14-3465-2020.pdf eng eng Copernicus Publications The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-14-3465-2020 https://noa.gwlb.de/receive/cop_mods_00054345 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00053996/tc-14-3465-2020.pdf https://tc.copernicus.org/articles/14/3465/2020/tc-14-3465-2020.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess CC-BY article Verlagsveröffentlichung article Text doc-type:article 2020 ftnonlinearchiv https://doi.org/10.5194/tc-14-3465-2020 2022-02-08T22:35:02Z Sea ice pressure poses great risk for navigation; it can lead to ship besetting and damages. Contemporary large-scale sea ice forecasting systems can predict the evolution of sea ice pressure. There is, however, a mismatch between the spatial resolution of these systems (a few kilometres) and the typical dimensions of ships (a few tens of metres) navigating in ice-covered regions. In this paper, the downscaling of sea ice pressure from the kilometre-scale to scales relevant for ships is investigated by conducting high-resolution idealized numerical experiments with a viscous-plastic sea ice model. Results show that sub-grid-scale pressure values can be significantly larger than the large-scale pressure (up to ∼ 4 times larger in our numerical experiments). High pressure at the sub-grid scale is associated with the presence of defects (e.g. a lead). Numerical experiments show significant stress concentration on both sides of a ship beset in sea ice, especially at the back. The magnitude of the stress concentration increases with the length of the lead (or channel) behind the ship and decreases as sea ice consolidates by either thermodynamical growth or mechanical closing. These results also highlight the difficulty of forecasting, for navigation applications, the small-scale distribution of pressure, and especially the largest values as the important parameters (i.e. the length of the lead behind the ship and the thickness of the refrozen ice) are not well constrained. Article in Journal/Newspaper Sea ice The Cryosphere Niedersächsisches Online-Archiv NOA The Cryosphere 14 10 3465 3478 |
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article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Lemieux, Jean-François Tremblay, L. Bruno Plante, Mathieu Toward a method for downscaling sea ice pressure for navigation purposes |
topic_facet |
article Verlagsveröffentlichung |
description |
Sea ice pressure poses great risk for navigation; it can lead to ship besetting and damages. Contemporary large-scale sea ice forecasting systems can predict the evolution of sea ice pressure. There is, however, a mismatch between the spatial resolution of these systems (a few kilometres) and the typical dimensions of ships (a few tens of metres) navigating in ice-covered regions. In this paper, the downscaling of sea ice pressure from the kilometre-scale to scales relevant for ships is investigated by conducting high-resolution idealized numerical experiments with a viscous-plastic sea ice model. Results show that sub-grid-scale pressure values can be significantly larger than the large-scale pressure (up to ∼ 4 times larger in our numerical experiments). High pressure at the sub-grid scale is associated with the presence of defects (e.g. a lead). Numerical experiments show significant stress concentration on both sides of a ship beset in sea ice, especially at the back. The magnitude of the stress concentration increases with the length of the lead (or channel) behind the ship and decreases as sea ice consolidates by either thermodynamical growth or mechanical closing. These results also highlight the difficulty of forecasting, for navigation applications, the small-scale distribution of pressure, and especially the largest values as the important parameters (i.e. the length of the lead behind the ship and the thickness of the refrozen ice) are not well constrained. |
format |
Article in Journal/Newspaper |
author |
Lemieux, Jean-François Tremblay, L. Bruno Plante, Mathieu |
author_facet |
Lemieux, Jean-François Tremblay, L. Bruno Plante, Mathieu |
author_sort |
Lemieux, Jean-François |
title |
Toward a method for downscaling sea ice pressure for navigation purposes |
title_short |
Toward a method for downscaling sea ice pressure for navigation purposes |
title_full |
Toward a method for downscaling sea ice pressure for navigation purposes |
title_fullStr |
Toward a method for downscaling sea ice pressure for navigation purposes |
title_full_unstemmed |
Toward a method for downscaling sea ice pressure for navigation purposes |
title_sort |
toward a method for downscaling sea ice pressure for navigation purposes |
publisher |
Copernicus Publications |
publishDate |
2020 |
url |
https://doi.org/10.5194/tc-14-3465-2020 https://noa.gwlb.de/receive/cop_mods_00054345 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00053996/tc-14-3465-2020.pdf https://tc.copernicus.org/articles/14/3465/2020/tc-14-3465-2020.pdf |
genre |
Sea ice The Cryosphere |
genre_facet |
Sea ice The Cryosphere |
op_relation |
The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-14-3465-2020 https://noa.gwlb.de/receive/cop_mods_00054345 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00053996/tc-14-3465-2020.pdf https://tc.copernicus.org/articles/14/3465/2020/tc-14-3465-2020.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/tc-14-3465-2020 |
container_title |
The Cryosphere |
container_volume |
14 |
container_issue |
10 |
container_start_page |
3465 |
op_container_end_page |
3478 |
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