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SUMMARY:A full-tensor approach for parameterising oceanic eddy tracer tran
 sport - Michael Haigh\, Imperial College London
DTSTART:20211025T120000Z
DTEND:20211025T130000Z
UID:TALK163876@talks.cam.ac.uk
CONTACT:Prof. Jerome Neufeld
DESCRIPTION:In numerical ocean models the effects of unresolved mesoscale 
 eddies on large-scale tracer distributions are typically represented by a 
 turbulent diffusion closure. Such a closure is characterised by a diffusiv
 ity coefficient for which scalars\, diagonal tensors and full tensors have
  been proposed. We opt for the most general full-tensor approach applied t
 o an eddy-resolving tracer simulation with no additional averaging or simp
 lifications. The resulting 'transport tensor' exhibits new levels of spati
 o-temporal complexity and its properties -- such as negative eigenvalues\,
  non-uniqueness and its relationship with the large-scale flow -- contrast
  those of eddy diffusion closures currently implemented in numerical ocean
  models. This work suggests a rethink of the role of mesoscale eddies and 
 their representation in numerical models may be required in order to impro
 ve our ability to simulate large-scale tracer distributions.
LOCATION:MR5\, CMS
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