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SUMMARY:Plume dynamics below Greenland’s largest floating ice tongue - M
 arkus Reinert (Leibniz Institute for Baltic Sea Research/AWI)
DTSTART:20231122T150000Z
DTEND:20231122T160000Z
UID:TALK208363@talks.cam.ac.uk
CONTACT:Dr Michael Haigh
DESCRIPTION:Ocean currents are important drivers of mass loss from ice she
 ets\, both around Antarctica and in the glacier fjords of Greenland. Below
  ice shelves\, the ocean causes basal melting\, which reduces ice sheet st
 ability and increases ice discharge\, contributing to sea level rise. We w
 ant to understand currents under ice shelves better and improve their repr
 esentation in climate models. Our modelling study focuses on Greenland’s
  largest floating ice tongue\, the 79° North Glacier\, which is similar t
 o Antarctic ice shelves\, so our findings can be generalised to both polar
  regions. Although our 2D-vertical model of the 79°N fjord is idealised\,
  the results agree well with observations of melt rate and overturning str
 ength. This is the first application of adaptive vertical coordinates to a
 n ice cavity\, achieving a vertical resolution finer than 1 m in the entra
 inment layer of the subglacial plume and thus allowing an accurate represe
 ntation of the plume development. The subglacial plume is the current at t
 he ice–ocean interface and the primary cause of basal melting. We show t
 hat the plume development is dominated by entrainment only initially. In t
 he stratified upper part of the glacier cavity\, the subglacial plume is s
 ubject to continuous detrainment. In a sensitivity study\, we analyse the 
 impact of ambient stratification and subglacial runoff on the melt rate an
 d on the depth of plume detachment from the ice tongue. As an outlook\, we
  explore how the situation changes in a more realistic setting with cross-
 fjord resolution and three-dimensional circulation.
LOCATION:BAS Seminar Room 1\; https://ukri.zoom.us/j/96975750799
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