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SUMMARY:Revisiting the Foundations of Ice shelf Basal Melt Parameterisatio
 ns for Stably Stratified Ice-Ocean Boundary Layers - Jayasankar Thrivikram
 an Pillai\, Northumbria University
DTSTART:20241204T140000Z
DTEND:20241204T150000Z
UID:TALK224383@talks.cam.ac.uk
CONTACT:Dr Birgit Rogalla
DESCRIPTION:Models are reported to overestimate basal melting under “war
 m water” ice shelves. Hence\, ice-ocean heat exchange and its parameteri
 sation are investigated using an ice-ocean boundary current model (IOBCM).
  Using the simplified case of a horizontal ice-ocean interface (IOI)\, we 
 demonstrate how common parameterizations in z-coordinate ocean models can 
 significantly overestimate melt rates in stably stratified boundary layers
  with slow far-field ocean currents.\n\nWe also conceptualise a hybrid app
 roach for the simple case of density driven currents under ice shelves. Th
 e hybrid model is a combination of the classic plume model for unstable re
 gimes and the parameterized version of the IOBCM for stable regimes. In th
 e hybrid model\, for stable regimes\, the melt rate as well as its respons
 e to warming are significantly reduced when compared to the regime indepen
 dent treatment in the plume model.\n\nOur findings highlight the importanc
 e of careful consideration of the ocean stratification and flow conditions
  when parameterizing ice-ocean interactions\, especially in regions with s
 low-moving currents and stable stratification.
LOCATION:BAS Seminar Room 1\; https://ukri.zoom.us/j/91087972169
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