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SUMMARY:Global tidal dissipation estimates using a simple analytical tool 
  - Adrien Lefauve\, University of Cambridge\, Department of Applied Mathem
 atics and Theoretical Physics
DTSTART:20150624T100000Z
DTEND:20150624T110000Z
UID:TALK59536@talks.cam.ac.uk
CONTACT:Jim Jordan
DESCRIPTION:The breaking of internal tides is believed to provide a large 
 part of the power needed to mix the abyssal ocean and sustain the meridion
 al overturning circulation. Both the fraction of internal tide energy that
  is dissipated locally and the resulting vertical mixing distribution are 
 crucial for the ocean state\, but remain poorly quantified. Here we presen
 t a first worldwide estimate of mixing due to internal tides generated at 
 small-scale abyssal hills. Our estimate is based on linear wave theory\, a
  non-linear parameterization for wave breaking and uses quasi-global small
 -scale abyssal hill bathymetry\, stratification and tidal data. \n\nCurren
 t tidal parameterizations only account for waves generated at large-scale 
 satellite-resolved bathymetry. Our results suggest that the presence of sm
 all-scale\, mostly unresolved abyssal hills could significantly enhance th
 e spatial inhomogeneity of tidal mixing\, particularly above mid-ocean rid
 ges in the Southern Hemisphere. We link the three-dimensional map of dissi
 pation to abyssal hills characteristics\, ocean stratification and tidal f
 orcing\, and discuss its potential implementation in time-evolving paramet
 erizations for global climate models.\n
LOCATION:British Antarctic Survey\, conference room
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