HIRLAM Use of the Hirlam NWP Model at Met Éireann (Irish Meteorological Service)

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HIRLAM Use of the Hirlam NWP Model at Met Éireann (Irish Meteorological Service) (James Hamilton -- Met Éireann). COMPUTER SYSTEM and VERSIONS of HIRLAM IBM RS/6000 SP : 9-nodes each with 4-CPU’s Operational Hirlam : 438x284 grid pts; 31-levels Nested Hirlam : 222x210 grid pts; 40-levels - PowerPoint PPT Presentation

Text of HIRLAM Use of the Hirlam NWP Model at Met Éireann (Irish Meteorological Service)

  • HIRLAM

    Use of the Hirlam NWP Modelat Met ireann (Irish Meteorological Service)

    (James Hamilton -- Met ireann)

  • COMPUTER SYSTEM and VERSIONS of HIRLAMIBM RS/6000 SP : 9-nodes each with 4-CPUs Operational Hirlam : 438x284 grid pts; 31-levels Nested Hirlam : 222x210 grid pts; 40-levelsLINUX PC : Twin Xeon Processors [2.0Ghz] Backup Hirlam : 218x144; 31-levelsLINUX PC : Twin Xeon Processors [500Mhz] Hourly Hirlam : 97x98 grid pts; 24-levelsLINUX Cluster : Nine Twin Xenon Processors [3.2GHz]Operational Hirlam : Test mode

  • OPERATIONAL HIRLAM IBM RS/6000 SP

    HIRLAM 5.0.1 with 3DVAR 3-Hour assimilation cycle with 48-hour forecasts every 6-hours Rotated lat/long 0.15x0.15 grid with 438x284 grid points Hybrid [eta] coordinates with 31-levels CBR vertical diffusion scheme; Sundqvist condensation scheme STRACO cloud scheme; Savijarvi radiation scheme Digital filter initialisation Two time-level Semi-Lagrangian semi-implicit scheme Use of frame boundaries from ECMWF

  • BACKUP HIRLAM LINUX-PC [Dual 2.0Ghz CPU]

    HIRLAM 4.3.5 with OI-Analysis 3-Hour assimilation cycle with 48-hour forecasts every 6-hours Rotated lat/long 0.30x0.30 grid with 218x144 grid points Hybrid [eta] coordinates with 31-levels SAME AREA AS OPERATIONAL HIRLAM

  • NESTED HIRLAM IBM RS/6000 SP

    HIRLAM 6.0.0 with 3DVAR 3-Hour assimilation cycle with 24-hour forecasts every 6-hours Model runs at intermediate hours 03Z, 09Z, 15Z, 21Z Rotated lat/long 0.12x0.12 grid with 222x210 grid points Hybrid [eta] coordinates with 40-levels Kain-Fritsch/Rasch-Kristjansson convection/condensation scheme ISBA surface scheme Output post-processed with MOS

  • HOURLY HIRLAM ... LINUX-PC [Dual 500Mhz CPU]

    HIRLAM 4.3 with OI Analysis Hourly assimilation cycle with hourly analysis and 3-hour forecast Rotated lat/long 0.15x0.15 grid with 97x98 grid points Hybrid [eta] coordinates with 24-levels Analysis shown on public web-site

  • OPERATIONAL USES of HIRLAM

    General Forecasting Forecast guidance out to 48-hoursWAM wave model Forecast 10-metre winds used to drive modelRoadice Prediction System Forecast parameters are used as first guess for [human] forecasterSATREP Overlay on satellite plots [ZAMG SATREP analysis scheme]

  • RESEARCH ACTIVITIES

    Better Specification of B.C.s for NWP modelsOperational Implementation of Nested SystemRegional Climate Analysis Modelling & Prediction CentreCommunity Climate Change Consortium for Ireland[RCAMPC and C4I]

  • EXPERIMENTS with LINUX CLUSTER

    Purchased small experimental Linux-Cluster Dell PowerEdge 1750 Twin Xeon nodes rack mounted 1 x Master node [2.8GHz, 4Gbytes] 9 x Compute nodes [3.2GHz, 2Gbytes] Compute nodes in 3x3 2-dimensional torus [Dolphin cards] RedHat ES-3/WS-3; PGI compilers; Intel compilers Scali MPI connect, Scali TCP connect, Scali Manage Original cluster had 6-nodes : upgraded to 9-nodes

  • EXPERIMENTS with LINUX CLUSTER

    Running Operational Hirlam on Cluster [9-node] Hirlam 5.0.1 with 3DVAR identical to operational system Forecast takes 62 mins on IBM/SP; 71 mins on cluster 3DVAR takes 15 mins on IBM/SP; 9 mins on cluster Full run takes 77 mins on IBM/SP; 80mins on cluster Therefore 9-node cluster is as fast as IBM/SPExperience with Cluster Generally Positive

  • FUTURE PLANS for CLUSTER .

    Investigate Use of Intel Compilers and Libraries Should be faster for running HirlamUse Cluster as test-bed to implement latest Hirlam 6.4Use Cluster to prepare benchmark for new mainframeReplace Mainframe end of 2006 / start of 2007

  • FUTURE PLANS

    Investigate Options to Replace Mainframe in 2006Get Hirlam 6.4 Running on ClusterInvestigate MOS/Neural-Nets for Post-ProcessingUse Hirlam as input to Point Data-Base

  • Thank You