ALADIN@CHMI

1. NEC SX-6/8A 64GB • 8 x 8 GFlops/s vector processors • 20 GFlops/s sustained • 64 GB shared memory 128 GB/s • SuperUX 15.1 • NQS batch processing • OpenMP and MPI Czech Hydrometeorological Institute ALADIN@CHMI OPERATIONAL • Model set-up • LACE domain (309x277 grid points,linear truncation E159x143, Δx=9km) • 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-0–3mt 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 temperature RMSE relative humidity 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 unrealistic local maxima (welcome by users)