Wave–ice interactions in the neXtSIM sea-ice model
In this paper we describe a waves-in-ice model (WIM), which calculates ice breakage and the wave radiation stress (WRS). This WIM is then coupled to the new sea-ice model neXtSIM, which is based on the elasto-brittle (EB) rheology. We highlight some numerical issues involved in the coupling and inve...
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fttriple:oai:gotriple.eu:oai:doaj.org/article:0d514ac89976430cadd07249ef620f52 2023-05-15T18:18:11+02:00 Wave–ice interactions in the neXtSIM sea-ice model T. D. Williams P. Rampal S. Bouillon 2017-09-01 https://doi.org/10.5194/tc-11-2117-2017 https://www.the-cryosphere.net/11/2117/2017/tc-11-2117-2017.pdf https://doaj.org/article/0d514ac89976430cadd07249ef620f52 en eng Copernicus Publications doi:10.5194/tc-11-2117-2017 1994-0416 1994-0424 https://www.the-cryosphere.net/11/2117/2017/tc-11-2117-2017.pdf https://doaj.org/article/0d514ac89976430cadd07249ef620f52 undefined The Cryosphere, Vol 11, Pp 2117-2135 (2017) geo envir Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2017 fttriple https://doi.org/10.5194/tc-11-2117-2017 2023-01-22T18:52:06Z In this paper we describe a waves-in-ice model (WIM), which calculates ice breakage and the wave radiation stress (WRS). This WIM is then coupled to the new sea-ice model neXtSIM, which is based on the elasto-brittle (EB) rheology. We highlight some numerical issues involved in the coupling and investigate the impact of the WRS, and of modifying the EB rheology to lower the stiffness of the ice in the area where the ice has broken up (the marginal ice zone or MIZ). In experiments in the absence of wind, we find that wind waves can produce noticeable movement of the ice edge in loose ice (concentration around 70 %) – up to 36 km, depending on the material parameters of the ice that are used and the dynamical model used for the broken ice. The ice edge position is unaffected by the WRS if the initial concentration is higher (≳ 0.9). Swell waves (monochromatic waves with low frequency) do not affect the ice edge location (even for loose ice), as they are attenuated much less than the higher-frequency components of a wind wave spectrum, and so consequently produce a much lower WRS (by about an order of magnitude at least). In the presence of wind, we find that the wind stress dominates the WRS, which, while large near the ice edge, decays exponentially away from it. This is in contrast to the wind stress, which is applied over a much larger ice area. In this case (when wind is present) the dynamical model for the MIZ has more impact than the WRS, although that effect too is relatively modest. When the stiffness in the MIZ is lowered due to ice breakage, we find that on-ice winds produce more compression in the MIZ than in the pack, while off-ice winds can cause the MIZ to be separated from the pack ice. Article in Journal/Newspaper Sea ice The Cryosphere Unknown The Cryosphere 11 5 2117 2135 |
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geo envir T. D. Williams P. Rampal S. Bouillon Wave–ice interactions in the neXtSIM sea-ice model |
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geo envir |
description |
In this paper we describe a waves-in-ice model (WIM), which calculates ice breakage and the wave radiation stress (WRS). This WIM is then coupled to the new sea-ice model neXtSIM, which is based on the elasto-brittle (EB) rheology. We highlight some numerical issues involved in the coupling and investigate the impact of the WRS, and of modifying the EB rheology to lower the stiffness of the ice in the area where the ice has broken up (the marginal ice zone or MIZ). In experiments in the absence of wind, we find that wind waves can produce noticeable movement of the ice edge in loose ice (concentration around 70 %) – up to 36 km, depending on the material parameters of the ice that are used and the dynamical model used for the broken ice. The ice edge position is unaffected by the WRS if the initial concentration is higher (≳ 0.9). Swell waves (monochromatic waves with low frequency) do not affect the ice edge location (even for loose ice), as they are attenuated much less than the higher-frequency components of a wind wave spectrum, and so consequently produce a much lower WRS (by about an order of magnitude at least). In the presence of wind, we find that the wind stress dominates the WRS, which, while large near the ice edge, decays exponentially away from it. This is in contrast to the wind stress, which is applied over a much larger ice area. In this case (when wind is present) the dynamical model for the MIZ has more impact than the WRS, although that effect too is relatively modest. When the stiffness in the MIZ is lowered due to ice breakage, we find that on-ice winds produce more compression in the MIZ than in the pack, while off-ice winds can cause the MIZ to be separated from the pack ice. |
format |
Article in Journal/Newspaper |
author |
T. D. Williams P. Rampal S. Bouillon |
author_facet |
T. D. Williams P. Rampal S. Bouillon |
author_sort |
T. D. Williams |
title |
Wave–ice interactions in the neXtSIM sea-ice model |
title_short |
Wave–ice interactions in the neXtSIM sea-ice model |
title_full |
Wave–ice interactions in the neXtSIM sea-ice model |
title_fullStr |
Wave–ice interactions in the neXtSIM sea-ice model |
title_full_unstemmed |
Wave–ice interactions in the neXtSIM sea-ice model |
title_sort |
wave–ice interactions in the nextsim sea-ice model |
publisher |
Copernicus Publications |
publishDate |
2017 |
url |
https://doi.org/10.5194/tc-11-2117-2017 https://www.the-cryosphere.net/11/2117/2017/tc-11-2117-2017.pdf https://doaj.org/article/0d514ac89976430cadd07249ef620f52 |
genre |
Sea ice The Cryosphere |
genre_facet |
Sea ice The Cryosphere |
op_source |
The Cryosphere, Vol 11, Pp 2117-2135 (2017) |
op_relation |
doi:10.5194/tc-11-2117-2017 1994-0416 1994-0424 https://www.the-cryosphere.net/11/2117/2017/tc-11-2117-2017.pdf https://doaj.org/article/0d514ac89976430cadd07249ef620f52 |
op_rights |
undefined |
op_doi |
https://doi.org/10.5194/tc-11-2117-2017 |
container_title |
The Cryosphere |
container_volume |
11 |
container_issue |
5 |
container_start_page |
2117 |
op_container_end_page |
2135 |
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1766194662419202048 |