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SUMMARY:Geometric feedback on the Antarctic ice shelf melting by 2200 - Ji
 ng Jin\, University of Liverpool
DTSTART:20240717T130000Z
DTEND:20240717T140000Z
UID:TALK213418@talks.cam.ac.uk
CONTACT:Dr Yohei Takano
DESCRIPTION:For external attendees\, please email Yohei Takano (yokano at 
 bas.ac.uk) or Birgit Rogalla (birgal at bas.ac.uk) to arrange for access t
 o BAS.\n\nThe Antarctic Ice Sheet (AIS) is one of the major Earth componen
 ts and is crucial to the future evolution of global sea level. The Antarct
 ic ice shelves\, the floating parts of AIS\, have been observed thinning a
 nd losing buttressing to the grounded ice. Here we use a two-way coupled U
 KESM1.0-ice model with an interactive ice sheet model to investigate the A
 ntarctic ice shelf-ocean interactions. We extend an SSP5-8.5 run described
  in Siahaan et al. (2022) to 2200\; and focus on the evolution of Antarcti
 c ice shelf melting. The basal melt rates of three large cold ice shelves 
 (Ross\, Filchner-Ronne and Amery) exhibit similar peak-and-decline behavio
 urs\, despite the warming in the ice shelf cavities. This is due to ice ge
 ometric feedback: 1. Strong stratification beneath the ice shelf after the
  fast melting prevents the warm seawater from approaching the ice\; 2. The
  flattening and rising of the ice shelf base reduce the oceanic heat trans
 ferred into the ice. The melt rates in the experiment without interactive 
 ice sheets are several times larger than those in the experiment with inte
 ractive ice sheets. Comparisons of the two experiments suggest the need to
  include geometric feedback in climate models to reduce the uncertainty in
  the projections of Antarctic mass evolution.  
LOCATION:BAS Seminar Room 1\; https://bas-ac-uk.zoom.us/j/96895680089
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