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SUMMARY:A regime diagram for ocean geostrophic turbulence - Andreas Klocke
 r\, UTAS
DTSTART:20141009T150000Z
DTEND:20141009T160000Z
UID:TALK54500@talks.cam.ac.uk
CONTACT:Dr Dan Jones
DESCRIPTION:A two-dimensional regime diagram for geostrophic turbulence in
  the ocean is constructed by plotting observation-based estimates of the n
 ondimensional eddy radius and unsuppressed mixing length against a nonline
 arity parameter equal to the ratio of the root-mean square eddy velocity a
 nd baroclinic Rossby phase speed. For weak nonlinearity\,  as found in the
  tropics\, the mixing length mostly corresponds to the marginal stability 
 threshold for baroclinic instability whereas the eddy radius corresponds t
 o the Rhines scale\; it is suggested that this mismatch is indicative of t
 he inverse energy cascade that occurs at low latitudes in the ocean and th
 e zonal elongation of eddies. At larger values of nonlinearity\, as found 
 at mid- and high-latitudes\, the  eddy length scales are much shorter than
  the  stability threshold\,  within a factor of 2.5 of the Rossby deformat
 ion radius. However\, better agreement is found with a turbulent $\\beta$ 
 length scale across much of the ocean. 
LOCATION:British Antarctic Survey\, Room 330B
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