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SUMMARY:Modeling ocean eddies in the Ross Sea\, Antarctica - Mack\, Stefan
 ie L.\, British Antarctic Survey
DTSTART:20191126T110000Z
DTEND:20191126T120000Z
UID:TALK135169@talks.cam.ac.uk
CONTACT:Louis Couston
DESCRIPTION:Ice shelf basal melt rates around Antarctica are affected by t
 he advection of warm Circumpolar Deep Water (CDW) onto the continental she
 lf and under the ice shelf. In ocean models\, resolving mesoscale eddies i
 s necessary to capture eddy fluxes of CDW and estimate basal melt rates of
  ice shelves. Where and when (not if) eddies are resolved in an ocean mode
 l depends on the baroclinic Rossby radius and thus on stratification and l
 atitude. The Ross Sea presents some interesting scientific questions in tw
 o regards: first\, it is weakly stratified in winter conditions\, lowering
  the radius of deformation\; and second\, the Ross Ice Shelf melts mainly 
 from dense shelf water at the grounding line and from light surface water 
 at the ice shelf front\, rather than CDW. An investigation using a ROMS (R
 egional Ocean Modelling System) model of the Ross Sea reveals that portion
 s of the domain (48% in well-mixed winter conditions\, and 33% in stratifi
 ed summer conditions) do not resolve mesoscale eddies even at a horizontal
  grid spacing of 1.5 km. We find that smaller grid spacing (1.5 km versus 
 5 km) leads to increased eddy generation in the model\, and eddies that cr
 oss the ice shelf front in both directions. However\, there is no signific
 ant change in basal melt between low and high resolution simulations. Whil
 e even higher resolution is needed to fully represent eddies in the Ross S
 ea\, the processes that control basal melt of the Ross Ice Shelf may not b
 e strongly affected by these eddies.
LOCATION:British Antarctic Survey\, Seminar Room Two
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