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SUMMARY:Spatio-temporal Melt and Basal Channel Evolution on Pine Island Gl
 acier Ice Shelf from CryoSat-2 - Katie Lowery\, British Antarctic Survey
DTSTART:20250312T140000Z
DTEND:20250312T150000Z
UID:TALK228055@talks.cam.ac.uk
CONTACT:Dr Birgit Rogalla
DESCRIPTION:Ice shelves buttress the grounded ice sheet\, restraining its 
 flow into the ocean. Mass loss from these ice shelves occurs primarily thr
 ough ocean-induced basal melting\, with the highest melt rates occurring i
 n regions that host basal channels - elongated\, kilometre-wide zones of r
 elatively thin ice. While some models suggest that basal channels could mi
 tigate overall ice shelf melt rates\, channels have also been linked to ba
 sal and surface crevassing\, leaving their cumulative impact on ice-shelf 
 stability uncertain. Due to their relatively small spatial scale and the l
 imitations of previous satellite datasets\, our understanding of how chann
 elised melting evolves over time remains limited. In this study\, we prese
 nt a novel approach that uses CryoSat-2 radar altimetry data to calculate 
 ice shelf basal melt rates\, demonstrated here as a case study over Pine I
 sland Glacier (PIG) ice shelf. Our method generates monthly Digital Elevat
 ion Models (DEMs) and melt maps with a 250 m spatial resolution. The data 
 show that near the grounding line\, basal melting preferentially melts a c
 hannel’s western flank 50% more than its eastern flank. Additionally\, w
 e find that the main channelised geometries on PIG are inherited upstream 
 of the grounding line and play a role in forming ice shelf pinning points.
  These observations highlight the importance of channels under ice shelves
 \, emphasising the need to investigate them further and consider their imp
 acts on observations and models that do not resolve them.
LOCATION:BAS Seminar Room 2
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