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2002 MM5 Model Evaluation 12 & 36 km Sensitivity Tests

2002 MM5 Model Evaluation 12 & 36 km Sensitivity Tests. Chris Emery, Yiqin Jia, and Ralph Morris ENVIRON International Corporation Zion Wang UCR CE-CERT Western Regional Air Partnership (WRAP) Regional Modeling Center (RMC) National RPO Meeting May 25, 2004. Addition of 12-km WRAP Grid.

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2002 MM5 Model Evaluation 12 & 36 km Sensitivity Tests

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  1. 2002 MM5 Model Evaluation12 & 36 km Sensitivity Tests Chris Emery, Yiqin Jia, and Ralph Morris ENVIRON International Corporation Zion Wang UCR CE-CERT Western Regional Air Partnership (WRAP) Regional Modeling Center (RMC) National RPO Meeting May 25, 2004

  2. Addition of 12-km WRAP Grid • IC/BC’s extracted from 36-km MM5 fields • 3-D FDDA fields extracted from 36-km MM5 fields • Preliminary 5-day run starting 12Z July 1

  3. Subdomains for 12-km Model Evaluation 1 = Pacific NW 2 = SW 3 = North 4 = Desert SW 5 = CenrapN 6 = CenrapS 7 = Great Lakes 8 = Ohio Valley 9 = SE 10 = NE 11 = MidAtlantic

  4. 2002 MM5 12 km Sensitivity Tests • Tests with 12-km grid: • Run 1 (initial simulation): • Soil moisture nudging on • Initial soil moisture from 36-km output • 3-D FDDA from 36-km output (no 2-D surface FDDA) • No Obs FDDA • Run 2: • Soil moisture nudging off • Initial soil moisture from LANDUSE.TBL • 3-D FDDA from 36-km output • Observational FDDA from NCAR DS.472

  5. 2002 MM5 12 km Sensitivity Tests • Run 3: • Soil moisture nudging off • Initial soil moisture from 36-km output • 3-D FDDA from 36-km output • Obs FDDA from NCAR DS.472 • Run 4: • Soil moisture nudging off • Initial soil moisture from 36-km EDAS fields • 3-D FDDA from 36-km EDAS fields • Obs FDDA from NCAR DS.472

  6. 2002 MM5 12 km Sensitivity Tests • Overall: • No significant impact on wind speed/direction performance in any run • Focus on temperature & humidity performance • Run 2 (soil nudging off, default moisture, Obs FDDA): • Best performance in Desert SW, but worst in other regions • Run 3 (soil nudging off, Obs FDDA): • Performance slightly improved in all 3 regions

  7. 2002 MM5 12 km Sensitivity Tests • Run 4 (soil nudging off, EDAS moisture, EDAS + Obs FDDA): • Similar to Run 3, but even better performance in Desert SW • Removing soil moisture nudging has a positive impact on performance • Using EDAS to provide initial soil moisture and analysis FDDA (instead of 36-km MM5 results) has a positive impact on performance • Obs FDDA has negligible impact on performance

  8. 2002 MM5 36 km Sensitivity Tests • Tests with 36-km grid: • Run 0 (initial simulation): • Soil moisture nudging on • 3-D & 2-D nudging to EDAS enhanced with NWS observations • Cumulus parameterization is KF • LSM/PBL is P-X • Run 1: • Soil moisture nudging off

  9. 2002 MM5 36 km Sensitivity Tests • Run 2: • Soil moisture nudging off • Cumulus parameterization changed to KF II (based on comparison to VISTAS results) • Run 3: • Soil moisture nudging off • Cumulus parameterization changed to KF II (based on comparison to VISTAS results) • LSM/PBL changed to NOAH and modified-MRF (removal of “scaled virtual temperature excess” and “convective velocity” contribution in U* calculation)

  10. 2002 MM5 36 km Sensitivity Tests • Overall: • No significant impact on wind performance, generally sensitivity cases slightly reduce speed • Focus on temperature & humidity performance • Run 1 (soil nudging off): • No significant impact in Desert SW • Improved performance in SW • Mixed performance in Pacific NW • Run 2 (KF II): • Similar results to Run 1 in SW and Pacific NW • Good improvement in Desert SW

  11. 2002 MM5 36 km Sensitivity Tests • Run 3 (NOAH + modified MRF): • Best overall performance in Desert SW • Worst performance in SW and Pacific NW • Summary: • Soil moisture nudging is generally a negative attribute • KF II helps performance where most convection occurs • Moving to a different LSM/PBL combo is not a universally good idea

  12. New 36/12 Nested Sensitivity Test • Run 5: • 2-way nesting • No soil moisture nudging • KF II • P-X LSM/PBL • Wind performance similar to all other runs in all regions • Similar temperature & humidity performance to other tests in SW and Pacific NW • Best temperature & humidity performance of all runs in Desert SW

  13. New 36/12 Nested Sensitivity Test • Run 5 forms basis for revised 2002 36/12 WRAP simulations • Identical physical configuration • 1-way grid nesting (2-way set up but no feedback) • Adds 2-D surface nudging on 12-km grid to EDAS enhanced with NWS observations

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