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SUMMARY:Variability of eddy-mean flow interactions in atmospheric storm tr
 acks and an application to the ACC. - Dr. Maarten Ambaum\, University of R
 eading
DTSTART:20151104T140000Z
DTEND:20151104T150000Z
UID:TALK60551@talks.cam.ac.uk
CONTACT:Dr Dave Munday
DESCRIPTION:The paradigm of eddies growing on a given mean flow has served
  us well. It is however incomplete. Most perturbations grow and modify the
  mean flow at the same time. We propose a simplified heuristic framework t
 o describe this interaction between eddies and mean flow. It has the mathe
 matical form of a nonlinear relaxation oscillator. We show that the atmosp
 heric storm tracks are remarkably well described by this framework. One of
  its features is that the system evolves around a state of marginal stabil
 ity. This has some surprising consequences: forcing of the mean flow contr
 ols the mean eddy state (oceanographers may recognise this as "eddy satura
 tion")\, and damping of the eddies controls the mean flow. We will show so
 me evidence for these counterintuitive ideas\, including the control of th
 e ACC strength.
LOCATION:British Antarctic Survey\, Room 307
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