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SUMMARY:Unified Multiscale Operational Weather Forecasting at the Canadian
  Meteorological Centre - Ct\, J (UQAM - Universit du Qubec  Montral)
DTSTART:20120824T143000Z
DTEND:20120824T150000Z
UID:TALK39382@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:The genesis of the unified Global Environmental Multiscale mod
 el and forecasting system that was gradually deployed since 1997 will be p
 resented. It was originally designed for both forecasting and data assimil
 ation at uniform resolution global scale and variable resolution continent
 al scale. It could also be run for mesoscale forecasting over smaller area
 s by increasing the stretching of the grid. The formulation of the model a
 llowed it to be run either in hydrostatic or non-hydrostatic mode. Tangent
  linear and adjoint models were developed for variational data assimilatio
 n\, and data assimilation was performed first using 3D Var and later 4D Va
 r. More recently a global ensemble system was developed based on the GEM m
 odel for both ensemble forecasting and data assimilation. The modelling sy
 stem has been generalised in different directions to become a complete env
 ironmental prediction system: emergency response\, volcanic ashes\, air qu
 ality\, stratospheric ozone\, wave modelling\, coupling to rivers and ocea
 ns etc. \n\nThe development of a nested version of the model is having a p
 rofound impact on the forecasting system. After thorough testing\, it was 
 used successfully for operational forecasting at 1 km during the Vancouver
  Olympics in 2010 and it will become operational at 2.5 km over several wi
 ndows in Canada. A large uniform resolution nested model has been shown to
  be equivalent to the variable resolution version for continental forecast
  and was implemented operationally. The nested version has allowed the dev
 elopment of a regional ensemble system. A replacement of the uniform resol
 ution global grid by the composite Yin-Yang grid based on two uniform reso
 lution limited-area grids is under study. Preliminary testing is showing t
 his version to be equivalent in accuracy\, but free of the pole problem af
 fecting the grid point latitude-longitude models and much more suitable fo
 r future supercomputer architectures.\n \n
LOCATION:Seminar Room 1\, Newton Institute
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