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High-resolution RCM simulation of Kansas convective storms: Preliminary results

High-resolution RCM simulation of Kansas convective storms: Preliminary results William J. Gutowski, Jr., & David Flory Dept. Geol. & Atmospheric Sciences Dept. of Agronomy Iowa State University. Motivation. Study Basin-Scale Land-Atmosphere Water Cycle

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High-resolution RCM simulation of Kansas convective storms: Preliminary results

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  1. High-resolution RCM simulation of Kansas convective storms: Preliminary results William J. Gutowski, Jr., & David Flory Dept. Geol. & Atmospheric Sciences Dept. of Agronomy Iowa State University

  2. Motivation • Study Basin-Scale Land-Atmosphere Water Cycle • Focus: Walnut River Basin (Kansas, USA) GCIP Large-Scale Area - Southwest Observations: CASES ABLE ARM

  3. Motivation • Study Basin-Scale Land-Atmosphere Water Cycle • Focus: Walnut River Basin (Kansas, USA) Flat Terrain Convective Systems

  4. Motivation

  5. Motivation

  6. Model & Simulation • NCAR/Penn State Non-hydrostatic MM5 (V3.3) • Modified Grell cumulus convection • Mixed-phase microphysics • RRTM & Dudhia radiation • Burk-Thompson PBL • Smirnova et al. land surface model • Parallel Code  Cluster computation

  7. Model & Simulation 20-km grid (120 x 150) Grell & Pagowski 1994 - 1999

  8. Model & Simulation 20-km grid (120 x 150) Grell & Pagowski 1994 - 1999 5-km grid (121 x 165) May - August 1997 (after spin-up)

  9. Results - Precipitation

  10. Results - Precipitation

  11. Precipitation & Vertical Wind Contours Precip: last hour 5 mm/d (filled) Vert. Motion: 300 hPa instantaneous 2 m/s (lines) 20 LST - 20 June

  12. Precipitation & Vertical Wind 16 LST - 20 June

  13. Precipitation & Vertical Wind 17 LST - 20 June

  14. Precipitation & Vertical Wind 18 LST - 20 June

  15. Precipitation & Vertical Wind 19 LST - 20 June

  16. Precipitation & Vertical Wind 20 LST - 20 June

  17. Precipitation & Vertical Wind 21 LST - 20 June

  18. Precipitation & Vertical Wind 22 LST - 20 June

  19. Precipitation & Vertical Wind 23 LST - 20 June

  20. Precipitation & Vertical Wind 00 LST - 21 June

  21. Precipitation & Vertical Wind 01 LST - 21 June

  22. Precipitation & Vertical Wind

  23. Results - Precipitation

  24. Results - Precipitation

  25. Results - Precipitation

  26. Results - Precipitation

  27. Results - Vertical Motion

  28. Results - Vertical Motion

  29. Need More From Convection Parameterization? Grid            % Convective Param                    Precipitation          5 km 29% 20 km 30%

  30. Conclusion • Credible simulation of precipitation • Cumulative amount • Diurnal cycle • Somewhat organized evolution • But … excessive single-grid vertical motion? • Strong motion, generally at single points • Excessive high-intensity precip. on 20-om grid?

  31. Conclusion Thanks to: Georg Grell & Mariusz Pagowski (FSL) John Taylor (Argonne NL) Martyn Clark (CIRES) Acknowledgement: U.S. NOAA GAPP Program http://www.ogp.noaa.gov/mpe/gapp/gapp/abstracts/clark.htm

  32. Precipitation & Vertical Wind

  33. Results - Precipitation

  34. Station Distribution - CDC Analysis

  35. Precip. Diurnal Cycle Upper Ms. River

  36. Results - Precipitation

  37. Results

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