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SUMMARY:Mixing at the fringes of a rapidly melting Antarctic ice shelf - P
 rof. Alberto Naveira Garabato\, University of Southampton
DTSTART:20151201T130000Z
DTEND:20151201T140000Z
UID:TALK61901@talks.cam.ac.uk
CONTACT:Dr Dave Munday
DESCRIPTION:The processes regulating the physical exchanges across the fro
 nt of the\nPine Island Ice Shelf (one of the most rapidly melting Antarcti
 c ice\nshelves) in the Amundsen Sea are investigated through the analysis 
 of an\nextensive set of full-depth hydrographic\, velocity and microstruct
 ure\nmeasurements\, obtained as part of the ISTAR expedition in February 2
 014\,\nand an idealised high-resolution numerical circulation model. The o
 utflows\nof Ice Cavity Water (ICW)\, which contains elevated concentration
 s of\nmeltwater from the ice shelf\, are shown to be subject to very inten
 se\nsmall-scale turbulent mixing within 5 kilometres of the ice front. The
 \nrates of turbulent kinetic energy dissipation and diapycnal mixing in th
 e\noutflows are enhanced by up to four orders of magnitude relative to tho
 se\nin surrounding waters\, which are characterised by turbulence levels\n
 typical of the open ocean. An investigation of the causes of the\nintensif
 ied turbulence reveals that it is sustained by centrifugal\ninstability of
  the ICW outflows. The instability drives a secondary\nageostrophic circul
 ation that induces rapid lateral mixing between ICW and\npycnocline waters
  offshore\, thereby preventing the ICW outflows from\nreaching the upper-o
 cean mixed layer and directly influencing surface\nclimate in the region. 
 The significance of this process for the fate of\nmeltwater outflows from 
 other Antarctic ice shelves will be discussed.
LOCATION:British Antarctic Survey\, Room 307
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