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MCPL An I/O API Output Module for MM5

MCPL An I/O API Output Module for MM5. Carlie J. Coats, Jr. MCNC Environmental Modeling Center coats@emc.mcnc.org. MCPL Outline. Fits directly into MM5 Minimum of code changes to MM5 Works with both MM5v2 and MM5v3 Produces I/O API outputs directly

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MCPL An I/O API Output Module for MM5

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  1. MCPLAn I/O API Output Modulefor MM5 Carlie J. Coats, Jr. MCNC Environmental Modeling Center coats@emc.mcnc.org

  2. MCPL Outline • Fits directly into MM5 • Minimum of code changes to MM5 • Works with both MM5v2 and MM5v3 • Produces I/O API outputs directly • For SMOKE, MAQSIP, CMAQ*, Vis5D, TOPLATS, ... • Very fast and efficient • Profiling result: 31.8 seconds in 26,482-second MM5 run on IBM SP • Very flexible and powerful • Designed for easy modification/maintenance • “ boring code” • Extensively documented: http://www.emc.mcnc.org/projects/ppar/mcpl.html

  3. Fits Directly into MM5 • Non-hydrostatic shared-memory-mode MM5 only • Is OpenMP-parallel (one task per output file) • New directory MM5/mcpl contains MCPL and its worker routines • 13-line modification to mm5.F, 4-line modification to solve.F (including fix to calculation of XTIME), 5-line modification to MM5/Makefile • Entry MCPL_GRID does set-up, file-creation • Entry MCPL_OUT does output at each time step • Entry MCPL_KF2 does Kain-Fritsch convective-cloud processing and output

  4. I/O API Outputs • Time-Independent sigma-level • GRID_BDY_2D, GRID_BDY_3D, GRID_CRO_2D, GRID_CRO_3D, GRID_DOT_2D • Time-Dependent sigma-level • MET_BDY_2D, MET_BDY_3D, MET_CRO_2D, MET_CRO_3D, MET_DOT_3D • Time-Dependent pressure-level-interpolated • PRES_CRO_3D, PRES_DOT_3D • Contain interpolation coefficients (e.g., to calculate isobaric ozone) • KF-event • MET_KF_PRO, MET_KF_SCA • Variables: MM5-native + air quality related + “other”

  5. Very Flexible • Multiple output windows per MM5 domain • Each window has its own file-set • Each window has its own starting date, starting time, time step • Time step down to MM5 advection-step • Each file has its own variables-list • Works for both file and coupling modes of the Models-3 I/O API • Configured at MM5 program launch by environment variables • Because of the flexibility, this list is quite long but well standardized for particular applications (e.g., for air quality work) • See http://www.emc.mcnc.org/projects/ppar/mcpl.script.html

  6. Advantages • Very efficient computationally • Supports robust modeling protocols • meteorology input file time step should be smaller than cell size divided by maximum PBL wind speed (otherwise, gravity waves will cause AQM conservation problems) • Reduces resource consumption: one can configure MM5 to output just what files are required for the study being performed • Can look at/analyze/QA the MM5 output while MM5 is still running • Many additional diagnostic variables (e.g., sea-level pressure)

  7. Unique Applications of MCPL • Numerical air quality prediction (NAQP) • Unified MM5-Chem model • Coupled modeling systems • Cooperating-process coupled models using the I/O API coupling mode • MM5-SMOKE-AQM for air quality forecasting • MM5-TOPLATS/SSATS(-SMOKE-AQM) for enhanced groundwater/land-surface/surface-flux treatment

  8. NAQP (Simplified)

  9. SMOKE for NAQP

  10. ComparisonMCPL vs MCIP

  11. Vertical W-Wind Cross-section

  12. Virtual Temperature Cross-section

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