HIRLAM

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HIRLAM Use of the Hirlam NWP Model at Met
Éireann (Irish Meteorological Service) (James
Hamilton -- Met Éireann)
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• MAIN EVENTS SINCE LAST MEETING
• REPLACEMENT OF COMPUTER SYSTEM
• Collaboration agreement with ICHEC
• ICHEC Irish Centre for High-End Computing
• CHANGE FROM HIRLAM-5 to HIRLAM-7
• Better model and higher-resolution

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• IRISH CENTRE FOR HIGH-END COMPUTING
• ICHEC
• www.ichec.ie
• 'Bringing Capability Computing to the Irish
  Research Community'
• SFI Science Foundation Ireland
• HEA Higher Education Authority
• HARDWARE
• Shared memory system Bull Novascale NS6320
• Distributed memory system IBM eServer 1350

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• IRISH CENTRE FOR HIGH-END COMPUTING
• HARDWARE
• Distributed memory system IBM eServer cluster
  1350 consisting of 476 IBM e326 compute nodes
  with 20TB of tightly integrated high-performance
  SAN based around an IBM DS4500
• SuSe Linux 64-bit operating system
• Met Éireann uses 32 dual nodes for main run out
  of an allocation of 48
• Special execution queue

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• COMPUTER SYSTEM and VERSIONS of HIRLAM
• ICHEC
• Operational Hirlam 438x284 grid pts
  60-levels 15Km
• Nested Hirlam 438x395 grid pts 60-level 5Km
• LINUX PC
• Hourly Hirlam 166x163 40-levels 15Km 20-min
  cutoff
• LINUX Cluster Nine Twin Xenon Processors
  3.2GHz
• Backup Hirlam 438x284 grid pts 31-levels
  15Km
• ALL MODELS are HIRLAM version 7

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• OPERATIONAL HIRLAM ICHEC
• HIRLAM 7 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 60-levels backup
  has 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

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• NESTED HIRLAM ICHEC
• HIRLAM 7 with 3DVAR
• Runs every 6-hours with 30-hour forecasts
  6-hour cycle
• Rotated lat/long 0.05x0.05 grid with 438x395
  grid points
• Hybrid eta coordinates with 60-levels no
  backup
• CBR vertical diffusion scheme Sundqvist
  condensation scheme
• STRACO cloud scheme Savijarvi radiation scheme
• Digital filter initialisation
• Two time-level Semi-Lagrangian semi-implicit
  scheme
• Hourly boundaries from Hirlam operational model

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• HOURLY HIRLAM LINUX PC
• HIRLAM 7 with 3DVAR
• Runs every hour with 20-minute cutoff
• Rotated lat/long 0.15x0.15 grid with 166x163
  grid points
• Hybrid eta coordinates with 40-levels no
  backup
• Runs on one hour cycle 3-hour forecast
• Provides hourly analysis and short-range
  forecast
• Used on Met Éireann public internet site
  www.met.ie

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• OPERATIONAL USES of HIRLAM
• General Forecasting
• Forecast guidance out to 48-hours
• WAM wave model
• Forecast 10-metre winds drive model ECWAM at
  ICHEC
• Roadice Prediction System
• Forecast parameters are used as first guess for
  human forecaster
• SATREP
• Overlay on satellite plots ZAMG SATREP analysis
  scheme

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RESEARCH ACTIVITIES Better Specification of
B.C.s for NWP models Operational Implementation
of Nested System
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• LINUX CLUSTER mogall
• Small experimental Linux-Cluster used as Backup
• 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

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• LINUX CLUSTER mogall
• Used as Backup for Operational Hirlam
• Hirlam 7 with 3DVAR identical to operational
  system
• Both ICHEC and mogall on same 15Km grid
• ICHEC has 60 levels mogall has 31 levels

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FUTURE PLANS . Expand area to North of
Greenland Look at use of higher resolution ECMWF
boundary files Investigate 4DVAR Assimilation of
satellite data ATOVS
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Thank You