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SUMMARY:A microscale view of mixing and overturning across the Antarctic C
 ircumpolar Current - Prof. Alberto Naveira Garabato\, University of Southa
 mpton
DTSTART:20141112T140000Z
DTEND:20141112T150000Z
UID:TALK53151@talks.cam.ac.uk
CONTACT:Dr Alexander Brearley
DESCRIPTION:The meridional overturning circulation and stratfication of th
 e global\nocean are shaped critically by processes in the Southern Ocean. 
 The\nzonally unblocked nature of the Antarctic Circumpolar Current (ACC)\n
 confers the region with a set of special dynamics that ultimately results\
 nin the focussing therein of large vertical exchanges between layers\nspan
 ning the global ocean pycnocline. These vertical exchanges are thought\nto
  be mediated by oceanic turbulent motions (associated with mesoscale\neddi
 es and small-scale turbulence)\, yet the vastness of the Southern Ocean\na
 nd the sparse and intermittent nature of turbulent processes make their\nr
 elative roles and large-scale impacts extremely difficult to assess. Here\
 nwe address the problem from a new angle\, and use measurements of the\nce
 ntimetre-scale signatures of mesoscale eddies and small-scale turbulence\n
 obtained during the DIMES experiment to determine the contributions of\nth
 ose processes to sustaining large-scale meridional overturning across\nthe
  ACC. We find that mesoscale eddies and small-scale turbulence play\ncompl
 ementary roles in balancing a meridional circulation of O(1 mm / s)\nacros
 s the Southern Ocean\, and that their roles are underpinned by\ndistinct a
 nd abrupt variations in the rates at which they mix water\nparcels. The ph
 ysical controls behind these variations and their\nimplications for our un
 derstanding of the Southern Ocean circulation will\nbe discussed.
LOCATION:British Antarctic Survey\, Room 330B
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