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X-WR-CALNAME:Oceans at MIT
X-WR-CALDESC:Striving to understand\, harness and sustain Earth&#039\;s def
 ining frontier.
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UID:7f8gqhpvh8tmioqalvkb0i486k@google.com
DTSTAMP:20180503T092121Z
CATEGORIES;LANGUAGE=en-US:MIT Seminar | PAOC Oceanography and Climate Sack 
 Lunch
CONTACT:
DESCRIPTION:The ocean is populated by an intense geostrophic eddy field tha
 t is unresolved in most numerical ocean models used for climate prediction
 . A geometric framework for parameterising ocean eddy fluxes will be prese
 nted that is consistent with conservation of energy and momentum. The fram
 ework involves rewriting the residual-mean eddy force as the divergence of
  an eddy stress tensor. The magnitude of the eddy stress tensor is bounded
  by the eddy energy\, allowing its components to be rewritten in terms of 
 the eddy energy and non-dimensional parameters describing the mean 'shape'
  of the eddies\, analogous to “eddy ellipses” used in observational oceano
 graphy. These non-dimensional geometric parameters have strong connections
  with classical stability theory\, for example\, the new framework preserv
 es the functional form of the linear Eady growth rate and\, with one addit
 ional ingredient\, Arnold’s first stability theorem. This framework also l
 eads to a simple model of 'eddy saturation”: the relative insensitivity of
  the ocean circulation and stratification to the magnitude of the surface 
 wind stress in ocean models with explicit eddies. These results offer the 
 prospect of improved eddy parameterisations that both preserve the underly
 ing symmetries and conservation laws inherent in the unfiltered equations\
 , and reproduce empirical results that have been obtained with eddy-permit
 ting models.
DTSTART;TZID=America/New_York:20160406T120000
DTEND;TZID=America/New_York:20160406T130000
LOCATION:54-915
SEQUENCE:0
SUMMARY:SLS-David Marshall (Oxford) – A geometric interpretation of eddy-me
 an flow interaction in the ocean
URL:http://oceans.mit.edu/event/sls-david-marshall-oxford-a-geometric-inter
 pretation-of-eddy-mean-flow-interaction-in-the-ocean
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