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UID:20260405T183644EDT-8671u1FK1U@132.216.98.100
DTSTAMP:20260405T223644Z
DESCRIPTION:Numerical Instability in a Viscous Plastic Sea-Ice Model Arisin
 g from Unresolved Plastic Deformation\n\nThe plastic deformation wave in a
  viscous plastic sea-ice model travels at speeds greater than 25 m/s\, as 
 shown by Gray. It is this wave which dictates\, in a CFL sense\, the maxim
 um allowable time step for a given model grid spacing. We find that typica
 l configurations of high resolution (dx=5km) sea-ice models require a time
  step of less than ~100 second to resolve the plastic deformation wave. Th
 e constraint on the timestep will become more strict as models continue to
 wards higher spatial resolution. We show that failure to correctly resolve
  this wave introduces first order noise into the model deformation fields 
 and that the resulting error is exacerbated by use of the elastic-viscous-
 plastic integration technique. It is important that the model deformation 
 fields be correctly resolved as they are increasingly being analyzed as a 
 means to validate and compare different sea-ice rheologies. The underlying
  issue is the splitting in time of the sea-ice momentum and continuity equ
 ations\, resulting in a discrepancy between the sea-ice mass and momentum 
 at a given model time step. We propose the IMplicit-EXplicit (IMEX) method
  for coupling the momentum and continuity equations as a way of correctly 
 resolving the propagation of the plastic wave while maintaining a longer t
 ime step.\n
DTSTART:20160217T200000Z
DTEND:20160217T203000Z
LOCATION:Room 934\, Burnside Hall\, CA\, QC\, Montreal\, H3A 0B9\, 805 rue 
 Sherbrooke Ouest
SUMMARY:Student Seminar: James Williams
URL:https://www.mcgill.ca/meteo/channels/event/student-seminar-james-willia
 ms-255075
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