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SUMMARY:Numerical stabilisation schemes for ice-sheet models - Clara Henry
  (BAS)
DTSTART:20260311T130000Z
DTEND:20260311T140000Z
UID:TALK242992@talks.cam.ac.uk
CONTACT:Emma
DESCRIPTION:Ice-sheet modelling continues to be challenging because of the
  need to balance computational efficiency with model complexity\, a trade-
 off that affects the accuracy of sea-level projections. A major reason for
  the computational efficiency bottleneck is that the system of PDEs descri
 bing ice flow is stiff\, meaning that the time-step size is restricted by 
 fast-decaying modes. Generally\, restrictive time stepping can be alleviat
 ed by solving a system of PDEs implicitly rather than explicitly. However\
 , without modification\, this has not been shown to result in a marked imp
 rovement in the numerical stability and efficiency of ice-flow models.\n\n
 To address these time-step restrictions\, we develop numerical stabilisati
 on schemes for ice-sheet models of varying complexity by modifying the for
 cing term in the momentum equations. Our methods enable larger stable time
  steps\, including when using a fully implicit time-stepping scheme\, prov
 iding a pathway towards improved computational efficiency in large-scale s
 imulations of the Antarctic and Greenland Ice Sheets.
LOCATION:MR12
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