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SUMMARY:Madi Rosevear (University of Tasmania)
DTSTART:20201202T100000Z
DTEND:20201202T110000Z
DTSTAMP:20260423T052928Z
UID:BAS-PO/7
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/BAS-PO/7/">F
 ine-scale ocean processes in the basal melting of Antarctic ice shelves</a
 >\nby Madi Rosevear (University of Tasmania) as part of BAS Polar Oceans S
 eminar\n\n\nAbstract\nThe Antarctic Ice Sheet\, which comprises the larges
 t volume of ice on our planet\, is losing mass due to ocean-driven melting
  of its fringing ice shelves. Efforts to represent the effects of basal me
 lting in sea level projections are undermined by poor understanding of the
  turbulent ice shelf-ocean boundary layer (ISOBL)\, a meters-thick band of
  ocean that regulates heat and salt transfer between the ambient ocean and
  the ice. Ocean-climate models cannot resolve the ISOBL and rely on parame
 terisations to predict melting. However\, observations suggest that common
  ISOBL parameterisations only perform well in cold\, energetic ocean envir
 onments.\n\nIn this talk I will summarise some of the main findings of my 
 PhD thesis\, which uses both observational data and turbulence-resolving m
 odel simulations to characterise melting and ISOBL dynamics across a broad
  range of ocean states. The observational data comprises unique ocean and 
 in situ basal melt rate observations from beneath the Amery Ice Shelf. The
  modelling focuses on the ISOBL and is performed using resolved large-eddy
  simulation. The model domain consists of a horizontal ice-ocean interface
  underlain by a stratified ocean\, and is forced by a steady flow in geost
 rophic balance. Using these model simulations\, I investigate the coupled 
 ISOBL and melting response to ocean temperature and current forcing. Depen
 ding on the relative strength of the thermal and current forcing\, I find 
 that the ISOBL may be characterized as either “well-mixed” \, “strat
 ified” or “double-diffusive”. I use these results to develop a novel
  regime diagram for the ISOBL\, which provides new insight into the varied
  and nonlinear melting responses expected around Antarctica\, depending on
  the local conditions. Comparison to observed sub-ice shelf conditions and
  melt rates is favorable and demonstrates the relevance of these regimes o
 ver a broad range of realistic conditions.\n
LOCATION:https://researchseminars.org/talk/BAS-PO/7/
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