Poster ALADIN@chmi

1
Czech Hydrometeorological Institute
ALADIN_at_CHMI
OPERATIONAL

• Model set-up
• LACE domain (309x277 grid points,linear
  truncation E159x143, ?x9km)
• 43 vertical levels, mean orography
• time step 360 s
• OI surface analysis based on SYNOP data
• digital filter spectral blending of the upper air
  fields, long cut-off cycle (6h cycle, filtering
  at truncation E47x42, no DFI in the next 6h
  guess integration)
• digital filter blending incremental DFI
  initialization of short cut-off production
  analysis of the upper air fields
• 3h coupling interval
• ALADIN cycle 32t1_alr01 (ALARO-0 without 3MT)
• OpenMP parallel execution
• 00 and 12 UTC forecast to 54h
• 06 and 18 UTC forecast to 24h
• hourly off-line fullpos
• post-processing using obs-operators of OI
• hourly DIAGPACK analysis (SYNOPs)
• verifpack on AL12
• monitoring of SYNOP and TEMP observation based on
  OI quality control

• Operations
• HW system
• NEC SX-6/8A 64 GB
• Linux cluster (suite control products)
• operational team
• 4 NWPers (on-call support)
• computer operators
• the suite operated under SMS 4
• download of LBC via RMDCN

• ALARO-03mt package
• pseudo-prognostic TKE scheme (TKE fully
  prognostic but use of turbulent exchange
  coefficients computed diagnostically)
• cloud optics takes into account the effect of
  spectral saturation, globally across the
  atmosphere
• prognostic microphysical scheme of resolved
  clouds and precipitation
• prognostic cloud water, cloud ice, rain and snow
• parameterization of autoconversion, WBF process,
  evaporation, collection, sublimation and
  melting/freezing
• statistical sedimentation scheme
• diagnostic graupel effect
• vertical geometry of clouds and precipitation
  areas
• modified calculation of vertical diffusion
  coefficients in stable conditions
• radiation
• a simplified version of the Voigt-line-broadening
  effect
• revised statistical model for secondary thermal
  radiation coefficients

ALARO-0 CPU cost (24h forecast)
ALARO-0 minus 3MT profile
00 UTC model scores monthly scores against 33
Czech SYNOP stations
Major operational changes (October 2006
September 2007) 30 January 2007 ALARO-0
(without 3MT) package, introduction of prognostic
snow albedo and density and ozone climatology 11
July 2007 Fix to cloud geometry in microphysics
and sublimation of snow 3 September 2007 Switch
to CY32T1

• Validation of 3MT
• (current ALADIN/CE operational 3MT cascade and
  prognostic convection scheme)
• Ultimate goal for increasing the resolution
• Better model skills even at the current
  resolution are expected

ALARO-0 validations
relative humidity RMSE
temperature RMSE
black pre-ALARO red ALARO-0-3MT 6-22/11/2007
RMSE (pink areas denote better performance of 3MT
with respect to diagnostic scheme) 10 days
period with prevailing convective type
weather 21-30 June 2006 geopotential (top
left), temperature (bottom right), wind speed
(top right) and relative humidity (bottom right)
Precipitation fields
pre-ALARO
ALARO-0-3MT
radar gages
significantly reduced too strong contrast
upwind side / lee reduced numerical noise
inthe precipitation field and sometimes unrealist
ic local maxima (welcome by users)