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Recent NWP results from IMPROVE

Recent NWP results from IMPROVE. Efforts to improve the bulk microphysical parameterization in MM5, RUC, and WRF models. (plus excursions into PBL parameterizations). Greg Thompson, Roy Rasmussen, Bill Hall, Kyoko Ikeda (NCAR-RAL), Axel Seifert (Germany), Istvan Geresdi (Pecs, Hungary),.

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Recent NWP results from IMPROVE

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  1. Recent NWP results from IMPROVE Efforts to improve the bulk microphysical parameterization in MM5, RUC, and WRF models (plus excursions into PBL parameterizations) Greg Thompson, Roy Rasmussen, Bill Hall, Kyoko Ikeda (NCAR-RAL), Axel Seifert (Germany), Istvan Geresdi (Pecs, Hungary), IMPROVE data meeting, Seattle, WA, 13 July 2005

  2. List of MM5 case studies used as a baseline • 14 Feb 1990 (WISP) shallow, post-frontal, upslope cloud w/widespread FZDZ. • 30 Jan 1998 (NASA-SLDRP) shallow stratoCu, primarily CLW w/slight FZDZ. • 04 Feb 1998 (NASA-SLDRP) deep and dynamic snowstorm w/classic FZRA. • 01 Feb 2001 (IMPROVE-1) deep PacNW wide cold-frontal rainband system. • 28 Nov 2001 (IMPROVE-2) deep PacNW frontal system plus orographics. • 13 Dec 2001 (IMPROVE-2) deep PacNW frontal system plus orographics. Thompson, G. and B. C. Bernstein, 2005: Explicit forecasts of winter precipitation using an improved bulk microphysics scheme. Part II: Case studies. Mon. Wea. Rev.,in preparation. IMPROVE data meeting, Seattle, WA, 13 July 2005

  3. IMPROVE-1 case: 1-2 Feb 2001 major simulation flaw in timing of the front: MM5 is nearly 3 hours too fast with landfall (0z) IMPROVE data meeting, Seattle, WA, 13 July 2005

  4. 1-2 Feb 2001 moderate simulation flaw in stength of LLJ: MM5 is 5-10 m s-1 too weak around 900-800 mb IMPROVE data meeting, Seattle, WA, 13 July 2005

  5. Thermodynamics: 1-2 Feb 2001 IMPROVE data meeting, Seattle, WA, 13 July 2005

  6. Microphysics: 1-2 Feb 2001 Cloud ice (purple) Snow (blue) 0.01 g/kg 0.02 0.04 0.08 0.16 0.32 Cloud water (green) Cloud water (shaded) Graupel (red) melting Rain (green) KHQM sample microphysical variables plot IMPROVE data meeting, Seattle, WA, 13 July 2005

  7. IMPROVE-2 case: 13-14 Dec 2001 IMPROVE data meeting, Seattle, WA, 13 July 2005

  8. Thermodynamics: 13-14 Dec 2001 IMPROVE data meeting, Seattle, WA, 13 July 2005

  9. 13-14 Dec 2001: Observed precipitation Jump-off Joe Corbett and S.P. minimum 60 mm Potential corruption by snow Falls Creek Santiam Pass bad data after 1500 local time KCVO - Corvallis KSLE - Salem KEUG - Eugene KOTH - North Bend PARSL site (Sisters, OR) 12z 13 Dec 13z 14z 15z 16z 17z 18z 19z 20z 21z 22z 23z 00z 01z 02z 03z 04z 05z 06z 07z 08z 09z 10z 11z 12z 14 Dec KSLE - Salem PARSL site (Sisters, OR) IMPROVE data meeting, Seattle, WA, 13 July 2005

  10. Grid 3/4 (4/1.3 km spacing) precip accum IMPROVE data meeting, Seattle, WA, 13 July 2005

  11. Microphysics: 13-14 Dec 2001 IMPROVE data meeting, Seattle, WA, 13 July 2005

  12. Pre, inter, post-frontal IMPROVE data meeting, Seattle, WA, 13 July 2005

  13. WMO Cloud Modeling Workshop Effect of changing autoconversion only (6-hr precip) • WMO International Cloud Modeling Workshop • Every 4 years • July 2004 in Hamburg, Germany • “Case #3” 13-14 Dec 2001 IMPROVE-2 case study • All modelers use provided datasets • Intercompare model results • Variety of bulk micro param and one bin model • http://www.rap.ucar.edu/~gthompsn/workshop2004/ Istvan Geresdi bin microphys Bill Hall R-T; 2-moment snow; S&B autoconv. Jean-Pierre Chaboureau 2-moment MesoNH Axel Seifert 2-moment WRF Winfried Straub 2-moment Seifert in KAMM2 IMPROVE data meeting, Seattle, WA, 13 July 2005

  14. Summary and future work • 2D simulations • bulk scheme tuned to Geresdi’s bin/explicit model • comparisons to other bulk models (Seifert, Hall, …) • 3D case studies • numerous cases from variety of field projects • different precip formation mechanisms • different geographic regions (continental/maritime) • Future work • verification data especially other IMPROVE cases • other bulk species (aggregates) or 2-moments? • WRF model simulations • AIRS-2 cases • other field projects? IMPROVE data meeting, Seattle, WA, 13 July 2005

  15. empty IMPROVE data meeting, Seattle, WA, 13 July 2005

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