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SUMMARY:Coupled ice/ocean interactions during the future retreat of West A
 ntarctic ice streams in the Amundsen Sea sector - David Bett\, British Ant
 arctic Survey
DTSTART:20240229T110000Z
DTEND:20240229T120000Z
UID:TALK209926@talks.cam.ac.uk
CONTACT:Dr Birgit Rogalla
DESCRIPTION:The Amundsen Sea sector has some of the fastest-thinning ice s
 helves in Antarctica\, caused by high\, ocean-driven basal melt rates\, wh
 ich can lead to increased ice stream flow\, causing increased sea level ri
 se (SLR) contributions. In this study\, we present the results of a new sy
 nchronously coupled ice-sheet/ocean model of the Amundsen Sea sector. We u
 se the WAVI ice sheet model to solve for ice velocities and the MITgcm to 
 solve for ice thickness and three-dimensional ocean properties\, allowing 
 for full mass conservation in the coupled ice/ocean system. The coupled mo
 del is initialised in the present day and run forward under idealised warm
  and cold ocean conditions with a fixed ice front. We find that Thwaites G
 lacier dominates the future SLR from the Amundsen Sea sector\, with a SLR 
 that is approximately quadratic in time. The future evolution of Thwaites 
 Glacier depends on the life-span of small pinning points that form during 
 the retreat. The rate of melting around these pinning points provides the 
 link between future ocean conditions and the SLR from this sector and will
  be difficult to capture without a coupled ice/ocean model. Grounding-line
  retreat leads to a progressively larger Thwaites ice-shelf cavity\, leadi
 ng to a positive trend in total melting\, resulting from the increased ice
  basal surface area. Despite these important sensitivities\, Thwaites Glac
 ier retreats even in a scenario with zero ocean-driven melting. This demon
 strates that a tipping point may have been passed in these simulations and
  some SLR from this sector is now committed.
LOCATION:BAS Seminar Room 2\; zoom
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