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5. Developmental Testbed Center. Preliminary Core Test Results. Bob Gall. 18 April 2006. Core Test. Cases: Complete two retrospective runs per day, two months per season, all four seasons for both WRF-NMM and ARW (960 runs) Domains: nearly (99%) identical (dissimilar map projections)

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5. Developmental Testbed Center

Preliminary Core Test Results

Bob Gall

18 April 2006


Core Test

  • Cases: Complete two retrospective runs per day, two months per season, all four seasons for both WRF-NMM and ARW (960 runs)

  • Domains: nearly (99%) identical (dissimilar map projections)

  • Verification: exclude 5-grid point “halo” region outside common domain

  • Resolution: 13km for both cores (RUC resolution)

  • Vertical resolution: 50 levels for both cores, similar distribution

  • Initial conditions: RUC-13 for both cores (imposes domain limit)

  • Soil initial conditions: Noah LSM “option 99” (RUC LSM in Phase 2)

  • Boundary conditions: 6-h NAM for both cores (as with RUC)

  • Phase 1 (Dec05-Mar06): Use NMM physics for both dynamic cores

    • More tractable task to port NMM physics to ARW core than v.v.

    • “NMM physics”: Ferrier microphysics, MYJ PBL, BMJ convective scheme

  • Phase 2(Mar06-Jun06): Use “RUC-like” WRF-RR physics for both dynamic cores (requires porting of NCAR/RUC physics to NMM)









Time step 36 sec NMM

50 sec ARW

Ratio ARW/NMM

1.40

Time step 30 sec NMM

72 sec ARW

Ratio ARW/NMM

1.08

Preliminary Timing ResultsCore test domain and resolutionforecast duration 24 hoursPhysics calls:Radiation every 30 min both modelsOther physicsEvery other time step NMMEvery time step ARW



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