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SUMMARY:Relationship between sea ice deformation and rheology - Harold Heo
 rton (University College London)
DTSTART:20170915T090000Z
DTEND:20170915T092000Z
UID:TALK79391@talks.cam.ac.uk
CONTACT:INI IT
DESCRIPTION:The drift and deformation of sea ice floating on the polar oce
 ans is caused by the applied wind and ocean currents. The deformations of 
 sea ice over ocean basin length scales have observable patterns. Cracks an
 d leads can be observed in satellite images and within the velocity fields
  generated from floe tracking.   In a climate sea ice model the deformatio
 n of sea ice over ocean basin length scales is modelled using a rheology t
 hat represents the relationship between stresses and deformation within th
 e sea ice cover. Here we investigate the link between emergent deformation
  characteristics and the underlying internal sea ice stresses and force ba
 lance using the Los Alamos numerical sea ice climate model.   &nbsp\;  <br
 ><span><br>In order focus on the role of sea ice rheologies in producing d
 eformation we have developed an idealised square domain that tests the mod
 el response at spatial resolutions of up to 500 m. We use the Elastic Anis
 otropic Plastic and Elastic Viscous Plastic rheologies\, comparing their s
 tability over varying resolutions and time scales. Sea ice within the doma
 in is forced by idealised winds in order to compare the confinement of win
 d stresses and internal sea ice stresses. We document the characteristic d
 eformation patterns of convergent\, divergent and rotating stress states.<
 /span>
LOCATION:Seminar Room 1\, Newton Institute
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