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Relationship between sea ice deformation and rheology

Presented by: 
Harold Heorton University College London
Date: 
Friday 15th September 2017 - 10:00 to 10:20
Venue: 
INI Seminar Room 1
Abstract: 
The drift and deformation of sea ice floating on the polar oceans is caused by the applied wind and ocean currents. The deformations of sea ice over ocean basin length scales have observable patterns. Cracks and leads can be observed in satellite images and within the velocity fields generated from floe tracking. In a climate sea ice model the deformation of sea ice over ocean basin length scales is modelled using a rheology that represents the relationship between stresses and deformation within the sea ice cover. Here we investigate the link between emergent deformation characteristics and the underlying internal sea ice stresses and force balance using the Los Alamos numerical sea ice climate model.  

In order focus on the role of sea ice rheologies in producing deformation we have developed an idealised square domain that tests the model response at spatial resolutions of up to 500 m. We use the Elastic Anisotropic Plastic and Elastic Viscous Plastic rheologies, comparing their stability over varying resolutions and time scales. Sea ice within the domain is forced by idealised winds in order to compare the confinement of wind stresses and internal sea ice stresses. We document the characteristic deformation patterns of convergent, divergent and rotating stress states.
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University of Cambridge Research Councils UK
    Clay Mathematics Institute London Mathematical Society NM Rothschild and Sons