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SUMMARY:The influence of tides on melting and freezing beneath Filchner-Ro
 nne Ice Shelf\, and Antarctic Bottom Water production - Keith Makinson (Br
 itish Antarctic Survey)
DTSTART:20101006T100000Z
DTEND:20101006T110000Z
UID:TALK26373@talks.cam.ac.uk
CONTACT:Povl Abrahamsen
DESCRIPTION:An isopycnic coordinate ocean circulation model is used to inv
 estigate the role of tides in the ocean cavity beneath Filchner-Ronne Ice 
 Shelf\, focusing on sub-ice shelf melting and freezing\, and ocean circula
 tion. The model\, when forced with tides\, reproduces reasonably well the 
 spatial pattern and magnitude of basal melting and freezing\, and outflow 
 of ISW.  Also\, the internal recirculation within the sub ice shelf cavity
  intensifies significantly\, increasing melting 3-fold and refreezing 6-fo
 ld\, while the net melt rate and seawater flux through the cavity\, approx
 imately double. The average melt in the tidally driven model is 23 cm a^-1
 ^\, close to satellite base observations and at the lower end of the ocean
 ographic estimates\, while the ice shelf water outflow of 600\,000 m^3^ s^
 -1^\, mixes with shelf waters forming a cold\, dense overflow that spills 
 down the continental slope\, contributing to deep water formation. For the
  first time\, these results demonstrate that tidal forcing plays a key rol
 e in ice shelf-ocean interactions and deep water formation in the southern
  Weddell Sea.
LOCATION:British Antarctic Survey\, Room 307
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