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SUMMARY:The bottom-intensification of mixing causes large\, almost cancell
 ing\, abyssal upwelling and downwelling - Trevor McDougall\, School of Mat
 hematics and Statistics\, University of New South Wales
DTSTART:20170703T130000Z
DTEND:20170703T140000Z
UID:TALK73259@talks.cam.ac.uk
CONTACT:Dr Peter Davis
DESCRIPTION:   The bottom-intensification of diapycnal mixing in the abyss
 al ocean is studied using a simple buoyancy budget\, showing that the inte
 rior of the ocean exhibits strong diapycnal downwelling\, while there is s
 trong dianeutral upwelling in very thin continental bottom boundary layers
 .  For a given amount of Antarctic Bottom Water  which is upwelled through
  neutral density surfaces in the abyssal ocean (between 2000m and 5000m) u
 p to five times this volume flux is upwelled in narrow turbulent sloping b
 ottom boundary layers\, while up to four times the net upward volume trans
 port of Bottom Water flows downward across isopycnals in the near-boundary
  stratified ocean interior.  We conclude that the Stommel-Arons circulatio
 n of the abyssal ocean bears little relation to reality. \n\nThe second pa
 rt of the talk will discuss the melting and re-freezing under ice shelves\
 , demonstrating the application of TEOS-10 to this region of the ocean/ice
 .  \n
LOCATION:British Antarctic Survey\, Innovation Centre\, Conference Theatre
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