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SUMMARY:The Local Finite-Amplitude Rossby Wave Theory: Review\, Developmen
 t and Outlook - Clare\, Shao-Ying Huang
DTSTART:20160411T120000Z
DTEND:20160411T130000Z
UID:TALK65487@talks.cam.ac.uk
CONTACT:Alison Ming
DESCRIPTION:The Finite-Amplitude Rossby Wave Activity (FAWA) formalism has
  been developed by Nakamura and collaborators since 2010. Not only does FA
 WA satisfy the exact nonacceleration relation\, but it also allows a preci
 se partition of FAWA tendency into advection\, mixing (in terms of effecti
 ve diffusivity) and forcing. Various studies applied this theory to identi
 fy factors that govern the eddy-mean flow interactions at midlatitudes in 
 both general circulation models and reanalysis data. Recently\, Huang and 
 Nakamura (2016) generalized FAWA into a longitudinally local wave activity
  (LWA). As LWA quantifies waviness of potential vorticity (PV) contour at 
 each longitude and satisfies an approximate local non-acceleration relatio
 n\, it is a suitable candidate to diagnose localized phenomena such as atm
 ospheric blocking.\n \nIn this presentation\, I will first give a brief hi
 storical account of the development of finite-amplitude Rossby wave theory
  (i.e. previous work by Andrews\, Haynes\, Killworth\, Shepherd and McInty
 re) and how our LWA formalism incorporates these ideas. I will then review
  the (zonal mean) FAWA formalism and its application. Furthermore\, I will
  outline our LWA formalism and demonstrate with reanalysis data how LWA ca
 ptures the climatology of blocking and describes the life cycles of blocki
 ng episodes.
LOCATION:MR4\,  Centre for Mathematical Sciences\, Wilberforce Road\, Camb
 ridge
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