Putting the CO in COAMPS using the ESMF API

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Putting the CO in COAMPS using the ESMF API
Steve Lowder (CSC) Naval Research Lab Marine
Meteorology Division Monterey, CA
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Joint Collaboration
NRL Stennis Space Center, MS Oceanography
Division
Project funding provided by the Battlespace
Environments Institute
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Collaboration Benefits
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Current Coupling
Script Control
COAMPS Atmospheric Model Executable
NCOM Ocean Model Executable
Flux Coupling Executable
Files
Files
Data
Control
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Future Coupling
Driver with ESMF API
COAMPS Atmospheric Model Component
NCOM Ocean Model Component
Flux Coupling Component
Memory
Memory
states
states
Data
ESMF
Control
Single executable
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Alternate Build
Driver without ESMF API
COAMPS Atmospheric Model Component
NCOM Ocean Model Component
Flux Coupling Component
Memory
Memory
states
states
Data
ESMF
Control
Single executable
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Current Status
Driver with ESMF API
COAMPS Atmospheric Model Component
NCOM Ocean Model Component
Flux Coupling Component
Memory

• Init
• Run
• Finalize

states
Tim Campbell NRL Stennis

• Init
• Run
• Finalize

• Init
• Run
• Finalize

Data
ESMF
Control
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Latest Effort
Driver with ESMF API
Dummy Atmos Comp
Dummy Ocean Comp
Dummy Coupler Comp
Memory
Memory
states
states
Initialization Component Architecture IO
Checkpoint/restart Concurrency
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Initialization
Text editor
GUI based
ltmodelgt ltgridgt lt/gridgt lt/modelgt ltforecast-star
tgt lt/forecast-startgt
markup language
Namelists ENV vars
Namelists
ESMF Config file
Driver software
NCOM Ocean Model Component
COAMPS Atmospheric Model Component
Flux Coupling Component
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Component Architecture
Atmos Tasks (2x2)
Ocean Tasks (3x1)
regrid
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Component Architecture
Atmos Tasks (2x2)
Ocean Tasks (3x1)
regrid
Derive new fields in parallel
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Component Architecture
Atmos Tasks (2x2)
Ocean Tasks (3x1)
Redist
Redist
Derive Regrd
Derive new fields
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Component Architecture
Atmos Tasks (2x2)
Ocean Tasks (3x1)
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Timing
Driver with ESMF API

• Call
• per atmos timestep
• or
• per coupling interval

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Timing
Driver with ESMF API
per timestep
per couple interval
or
Parent Gridded Atmos Comp
COAMPS Atmospheric Model Component
per atmos timestep
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Performance

• COAMPS alone - no significant change, 2
• Dynamic coupling will be faster
• ESMF communication weights might help

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Technology Adoption
gulper
nibbler
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For sale talking dog
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Putting the CO in COAMPS using the ESMF
API Conclusion

• The Naval Research Laboratory is actively
  involved in incorporating ESMF into COAMPS
  through the BEI
• NRL MRY COAMPS atmospheric model and flux
  coupler
• NRL SSC NRL Coastal Ocean Model (NCOM)
• FY05 Work
• Constructing system design
• Testing prototypes
• Individual components to be finalized by the end
  of the year
• FY06 Plans
• Use ESMF components to establish two-way
  air/ocean coupling in COAMPS
• Review design for performance improvements
• Conduct two-way coupled experiments