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Poster ALADIN@chmi

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OI surface analysis based on SYNOP data. digital filter spectral blending of ... diagnostic graupel effect. vertical geometry of clouds and precipitation areas ... – PowerPoint PPT presentation

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Title: 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)
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