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SUMMARY:Eddy-Mean Flow Interactions in Western Boundary Current Jets: An O
 bservationally-Driven Theoretical Study - Dr. Stephanie Waterman\, Nationa
 l Oceanography Centre and the Grantham Institute for Climate Change\, Impe
 rial College London
DTSTART:20100630T100000Z
DTEND:20100630T110000Z
UID:TALK25158@talks.cam.ac.uk
CONTACT:Zhaomin Wang
DESCRIPTION:Eddies can play an important role in determining the large-sca
 le or low-frequency circulation.  This is especially true in Western Bound
 ary Current (WBC) jet regions such as the Gulf Stream or Kuroshio Extensio
 n regions\, where eddy kinetic energies are orders of magnitude larger tha
 n most other regions of the world ocean.  In this talk\, I present a study
  of the role of eddies and eddy-mean flow interactions in the dynamics of 
 WBC jet systems using both theoretical and observational approaches.  New 
 observations in the Kuroshio Extension located at the location of maximum 
 eddy kinetic energy of the jet motivate an idealized study of the role of 
 eddies in the downstream evolution of a WBC jet.  The relevance of these t
 heoretical results are in turn tested by comparing model predictions to ob
 servations.  I will show eddies play a critical role in setting the downst
 ream development of the time-mean jet structure\, including fluxing vortic
 ity up the mean gradient and driving time-mean flows which add significant
 ly to the jet transport.  This is important to our understanding of what i
 nfluences mean jet strength\, and also to the design of eddy parameterizat
 ions which often rely on down-gradient flux closure schemes.  Although foc
 ussed on WBC jet systems\, lessons learned likely apply to the roles eddie
 s play in the zonally-evolving jets of the ACC.
LOCATION:British Antarctic Survey\, Room 187
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