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CATEGORIES:DAMTP Atmosphere-Ocean Dynamics
SUMMARY:The Local Finite-Amplitude Rossby Wave Theory: Rev
iew\, Development and Outlook - Clare\, Shao-Ying
Huang
DTSTART;TZID=Europe/London:20160411T130000
DTEND;TZID=Europe/London:20160411T140000
UID:TALK65487AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/65487
DESCRIPTION:The Finite-Amplitude Rossby Wave Activity (FAWA) f
ormalism has been developed by Nakamura and collab
orators since 2010. Not only does FAWA satisfy the
exact nonacceleration relation\, but it also allo
ws a precise partition of FAWA tendency into advec
tion\, mixing (in terms of effective diffusivity)
and forcing. Various studies applied this theory t
o identify factors that govern the eddy-mean flow
interactions at midlatitudes in both general circu
lation models and reanalysis data. Recently\, Huan
g and Nakamura (2016) generalized FAWA into a long
itudinally local wave activity (LWA). As LWA quant
ifies waviness of potential vorticity (PV) contour
at each longitude and satisfies an approximate lo
cal non-acceleration relation\, it is a suitable c
andidate to diagnose localized phenomena such as a
tmospheric blocking.\n \nIn this presentation\, I
will first give a brief historical account of the
development of finite-amplitude Rossby wave theory
(i.e. previous work by Andrews\, Haynes\, Killwor
th\, Shepherd and McIntyre) and how our LWA formal
ism incorporates these ideas. I will then review t
he (zonal mean) FAWA formalism and its application
. Furthermore\, I will outline our LWA formalism a
nd demonstrate with reanalysis data how LWA captur
es the climatology of blocking and describes the l
ife cycles of blocking episodes.
LOCATION:MR4\, Centre for Mathematical Sciences\, Wilberfo
rce Road\, Cambridge
CONTACT:Alison Ming
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