BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Talks.cam//talks.cam.ac.uk//
X-WR-CALNAME:Talks.cam
BEGIN:VEVENT
SUMMARY:The CMC 15-Km operational deterministic global forecast system wit
 h Yin-Yang grid - Abdessamad Qaddouri\,   (Environment Canada)
DTSTART:20120928T101000Z
DTEND:20120928T103500Z
UID:TALK40240@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:At Canadian meteorological center (CMC)\, we are currently imp
 lementing the future 15-km operational deterministic global forecast syste
 m. In the horizontal we use spherical coordinates on the overset Yin-Yang 
 grid while in the vertical\, we use a log-hydrostatic-pressure coordinate 
 on the Charney-Phillips grid. The global forecast on the Yin-Yang grid is 
 performed by considering a domain decomposition (a two-way coupling method
 ) between two limited-area models (LAM)\, discretized on the two panels of
  Yin-Yang grid and using the same time step. Each panel of the Yin-Yang gr
 id system is extended by a static halo region that plays the same role as 
 the piloting region in limited-area modeling. Since the two sub-grids of t
 he Yin-Yang grid do not match\, the update of the variables in the pilot r
 egion is done by interpolation. \n\nEach limited-area model uses the same 
 fully implicit semi-Lagrangian method as in the GEM operational model to s
 olve its own dynamic core. Geophysical fields are produced separately for 
 each LAM grid however\, The two LAM models use the same parametrization sc
 hemes for the physics configuration. For data assimilation\, we use the E
 nsemble-Var (En-Var) approach where the 4D ensemble covariances are used t
 o produce 4D analysis without TL/AD models. \n\nIn this presentation we wi
 ll present some preliminary results of this work.\n\n
LOCATION:Seminar Room 1\, Newton Institute
END:VEVENT
END:VCALENDAR