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SUMMARY:Estimating ocean circulation and mixing: A contourwise view - Jan 
 Zika\, Laboratoire des Ecoulements Geophysiques et Industriels (LEGI)\, Gr
 enoble\, France
DTSTART:20091211T110000Z
DTEND:20091211T120000Z
UID:TALK21790@talks.cam.ac.uk
CONTACT:Zhaomin Wang
DESCRIPTION:Ocean mixing regulates the Global Overturning Circulation. Lac
 k of knowledge of ocean mixing\, its magnitude and spatial variation\, lea
 ds to large uncertainties in our estimates of the volume\, heat\, freshwat
 er\, nutrient and tracer transports and\, the role of the ocean in climate
  variability and feedbacks.\n\nMethods presently used for estimating ocean
  circulation from hydrographic data will be discussed including their diff
 iculty in elucidating mixing processes. The benefit of considering flow in
  a 'contourwise' sense will be demonstrated\, including an example from th
 e Southern Ocean.\n\nA new method called the tracer-contour inverse method
  will be introduced. The tracer-contour inverse method is able to infer th
 e general circulation and mixing from mean hydrographic data alone. The me
 thod is apparently less sensitive to error than conventional techniques an
 d has been validated against the output of a numerical model. The method h
 as been applied in the eastern North Atlantic and reproduces in-situ obser
 vations of mixing from the region.\n
LOCATION:British Antarctic Survey\, Room 307
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