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Efficient I/O API Output Module for MM5 Weather Modeling

The MCPL Output Module seamlessly integrates with MM5, requiring minimal code changes. Compatible with both MM5v2 and MM5v3, it produces direct I/O API outputs for various applications including SMOKE and CMAQ. This fast and efficient tool features easy modification and extensive documentation. By enabling multiple output windows and customizable variables, it supports robust air quality modeling with reduced resource consumption and provides real-time output analysis during model execution.

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Efficient I/O API Output Module for MM5 Weather Modeling

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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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