Journal cover Journal topic
The Cryosphere An interactive open-access journal of the European Geosciences Union
doi:10.5194/tc-2017-24
© Author(s) 2017. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
28 Feb 2017
Review status
This discussion paper is under review for the journal The Cryosphere (TC).
Wave-ice interactions in the neXtSIM sea-ice model
Timothy D. Williams1,2, Pierre Rampal1,2, and Sylvain Bouillon1,2 1Nansen Environmental and Remote Sensing Center, Thormøhlensgate 47, N5006, Bergen, Norway
2The Bjerknes Center for Climate Research, Bergen, Norway
Abstract. In this paper we describe a waves-in-ice model which calculates ice breakage and the wave radiation stress (WRS) that is 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 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 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. Swell waves do not produce any movement, as they are attenuated too little to induce a very large WRS.

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.


Citation: Williams, T. D., Rampal, P., and Bouillon, S.: Wave-ice interactions in the neXtSIM sea-ice model, The Cryosphere Discuss., doi:10.5194/tc-2017-24, in review, 2017.
Timothy D. Williams et al.
Timothy D. Williams et al.
Timothy D. Williams et al.

Viewed

Total article views: 266 (including HTML, PDF, and XML)

HTML PDF XML Total BibTeX EndNote
191 46 29 266 8 29

Views and downloads (calculated since 28 Feb 2017)

Cumulative views and downloads (calculated since 28 Feb 2017)

Viewed (geographical distribution)

Total article views: 266 (including HTML, PDF, and XML)

Thereof 265 with geography defined and 1 with unknown origin.

Country # Views %
  • 1

Saved

Discussed

Latest update: 27 Apr 2017
Publications Copernicus
Download
Short summary
As the Arctic sea ice extent drops, there is more ship traffic seeking to take advantage of this, and with it a need for better wave and sea ice forecasts. One aspect of this is the location of the sea ice edge. The waves here can be quite large, but they die away as they travel into the ice. This causes momentum to be transferred from the waves to the ice, causing ice drift. However, our study found that the effect of the wind drag had more impact on the ice edge position than the waves.
As the Arctic sea ice extent drops, there is more ship traffic seeking to take advantage of...
Share