Ice bridges and ridges in the Maxwell-EB sea ice rheology

Dansereau, Véronique; Weiss, Jérôme; Saramito, Pierre; Lattes, Philippe; Coche, Edmond

doi:10.5194/tc-2016-276

Cited by 8 publications

(46 citation statements)

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“…Compared to the observations, the NT simulation overestimates the number of months of landfast ice while it is the opposite for the simulation with tides (recall that, in Nares Strait, the amplitudes of our simulated tides are overestimated compared to the reconstructed OSU tides; Figure ). These results suggest that some models (e.g., Dansereau et al, ) might be able to simulate the North Water Polynya ice bridge and landfast ice in some regions of the CAA due to a compensation of errors; the ice is too thin or too weak but the model still simulates landfast ice because tidal forcing is not considered.…”

Section: Discussionmentioning

confidence: 99%

“…Rallabandi et al () developed an analytical theory of the flow of sea ice through narrow straits and on the formation of ice bridges. Dansereau et al () investigated the simulation of ice bridges with the new Maxwell‐elasto‐brittle rheology. To represent grounding in shallow water, Lieser () proposed a simple approach to set the ice at rest.…”

Section: Introductionmentioning

confidence: 99%

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The Impact of Tides on Simulated Landfast Ice in a Pan‐Arctic Ice‐Ocean Model

et al. 2018

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The impact of tides on the simulated landfast ice cover is investigated. Pan‐Arctic simulations are conducted with an ice‐ocean (CICE‐NEMO) model with a modified rheology and a grounding scheme. The reference experiment (without tides) indicates there is an overestimation of the extent of landfast ice in regions of strong tides such as the Gulf of Boothia, Prince Regent Inlet, and Lancaster Sound. The addition of tides in the simulation clearly leads to a decrease of the extent of landfast ice in some tidally active regions. This numerical experiment with tides is more in line with observations of landfast ice in all the regions studied. Thermodynamics and changes in grounding cannot explain the lower landfast ice area when tidal forcing is included. We rather demonstrate that this decrease in the landfast ice extent is dynamically driven by the increase of the ocean‐ice stress due to the tides.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Impact of Tides on Simulated Landfast Ice in a Pan‐Arctic Ice‐Ocean Model

et al. 2018

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“…This problem was addressed in the Maxwell Elasto-Brittle rheology (Dansereau et al, 2016) by including a viscous term in the constitutive relation, dissipating the elastic stresses into permanent deformations in the manner of a Maxwell visco-elastic material. The MEB rheology has been shown to reproduce the statistical characteristics of sea ice deformations, such as intermittency, fracture localization and fractality (Dansereau et al, 2017), and is now used in the most recent version of neXtSIM (Rampal et al, 2019). Dansereau et al (2017) used idealised and realistic Nares Strait ice bridge simulations to evaluate characteristics of the ice fracture at the geophysical scale produced by the MEB model.…”

Section: Introductionmentioning

confidence: 99%

“…The MEB rheology has been shown to reproduce the statistical characteristics of sea ice deformations, such as intermittency, fracture localization and fractality (Dansereau et al, 2017), and is now used in the most recent version of neXtSIM (Rampal et al, 2019). Dansereau et al (2017) used idealised and realistic Nares Strait ice bridge simulations to evaluate characteristics of the ice fracture at the geophysical scale produced by the MEB model. The rheology was shown to produce multiple ice arches in Nares Strait.…”

Section: Introductionmentioning

confidence: 99%

The material properties of ice bridges in the Maxwell Elasto-Brittle rheology

Plante

Tremblay

Lösch

et al. 2019

Preprint

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Abstract. The shape and break-up of landfast ice arches in narrow channels depend on the material properties of the sea-ice. The effect of the material parameters on ice arches in a sea ice model with the Maxwell Elasto-Brittle (MEB) rheology is investigated. The MEB rheology, which includes a damage parameterization, is implemented using the numerical framework of a Viscous-Plastic model. This configuration allows to study their different physics independently of their numerical implementation. Idealized ice bridge simulations show that the elastic part of the model together with the damage parameterization allows the propagation of fractures in space at very short time-scales. The fractures orientation is sensitive to the chosen angle of internal friction, but deviates from theory. It is speculated that these deviations stem from the absence of a flow rule in the rheology. Downwind of a channel, the MEB model easily forms ice arches and sustains an ice bridge. Using a material cohesion in the range of 15–21 kPa is most consistent with the ice bridges commonly observed in the Arctic. Upstream of the channel, the formation of ice arches is complicated by the absence of a relationship between the ice strength and the ice conditions, and by the presence of numerical errors associated with the damage parameterization. Results suggest that the formation of ice arches upwind of a channel is highly dependent on the rheology and calls for more analysis to determine the necessary conditions for their formation.

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“…In many of the current sea ice models included in the climate simulations, the treatment of internal stress within sea ice area is based on the sea ice rheology formulated by Hibler (), in which sea ice behaves as a plastic material under the ordinary stress and as viscous fluid under subcritical stress (Hunke et al, ; Losch et al, ; Wang, ). Although the Maxwell‐Elasto‐Brittle sea ice rheology has recently been shown to reproduce the fine features of sea ice near a strait successfully (Dansereau et al, ), it is not currently used in climate models. This concept was based on the isotropic and elastic‐plastic approach of Coon et al (), which was first identified during the Arctic Ice Dynamics Joint Experiment.…”

Section: Introductionmentioning

confidence: 99%

An Examination of the Sea Ice Rheology for Seasonal Ice Zones Based on Ice Drift and Thickness Observations

Nose

Kimura

2018

JGR Oceans

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The validity of the sea ice rheological model formulated by Hibler (1979), which is widely used in present numerical sea ice models, is examined for the Sea of Okhotsk as an example of the seasonal ice zone (SIZ), based on satellite‐derived sea ice velocity, concentration and thickness. Our focus was the formulation of the yield curve, the shape of which can be estimated from ice drift pattern based on the energy equation of deformation, while the strength of the ice cover that determines its magnitude was evaluated using ice concentration and thickness data. Ice drift was obtained with a grid spacing of 37.5 km from the AMSR‐E 89 GHz brightness temperature using a maximum cross‐correlation method. The ice thickness was obtained with a spatial resolution of 100 m from a regression of the PALSAR backscatter coefficients with ice thickness. To assess scale dependence, the ice drift data derived from a coastal radar covering a 70 km range in the southernmost Sea of Okhotsk were similarly analyzed. The results obtained were mostly consistent with Hibler's formulation that was based on the Arctic Ocean on both scales with no dependence on a time scale, and justify the treatment of sea ice as a plastic material, with an elliptical shaped yield curve to some extent. However, it also highlights the difficulty in parameterizing sub‐grid scale ridging in the model because grid scale ice velocities reduce the deformation magnitude by half due to the large variation of the deformation field in the SIZ.

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Ice bridges and ridges in the Maxwell-EB sea ice rheology

Cited by 8 publications

References 0 publications

The Impact of Tides on Simulated Landfast Ice in a Pan‐Arctic Ice‐Ocean Model

The Impact of Tides on Simulated Landfast Ice in a Pan‐Arctic Ice‐Ocean Model

The material properties of ice bridges in the Maxwell Elasto-Brittle rheology

An Examination of the Sea Ice Rheology for Seasonal Ice Zones Based on Ice Drift and Thickness Observations

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