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SUMMARY:Moving-mesh finite element modeling of ocean circulation near ice 
 shelf grounding lines - Ben Yeager\, Imperial College London
DTSTART:20180704T100000Z
DTEND:20180704T110000Z
UID:TALK107413@talks.cam.ac.uk
CONTACT:Dr Emma Boland
DESCRIPTION:Ice shelves play an important role in regulating the mass bala
 nce of ice sheets through their ability to buttress inland ice streams tha
 t drain to the ocean. When ice shelves thin\, their buttressing capabiliti
 es are decreased\, and the flow of ice mass to the ocean accelerates. In m
 uch of West Antarctica\, relatively warm (above freezing) water accesses i
 ce shelves near the grounding line---the point where an inland ice stream 
 transitions from a grounded glacier to a floating ice shelf---creating a m
 elt-water plume that rises along the underside of the ice shelf\, entraini
 ng warm water and driving further melting. The characteristics of the larg
 e-scale sub-shelf circulation\, and\, in turn\, the rate of ice-shelf thin
 ning\, depend heavily upon the characteristics of the near-grounding-line 
 ocean. Here we present an adaptive-mesh finite-element model of ocean circ
 ulation within a few kilometres of the grounding line of an idealised ice 
 shelf. Mesh spacing ranges from centimetres to meters\, and subgrid-scale 
 mixing effects are parametrised using a two-equation turbulence model. Fle
 xure of the ice shelf due to tides is simulated using Fluidity's moving me
 sh capabilities. Factors such as ocean temperature and tidal forcing are v
 aried and resulting effects on sub-shelf ocean stratification\, circulatio
 n\, and melt rates are observed.
LOCATION:British Antarctic Survey\, Seminar Room 330b
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