IMPROVE data meeting, Seattle, WA, 13 July 2005 Recent NWP results from Recent NWP results from IMPROVE IMPROVE Greg Thompson, Roy Rasmussen, Bill Hall, Kyoko Ikeda (NCAR-RAL), Axel Seifert (Germany), Istvan Geresdi (Pecs, Hungary), Efforts to improve the bulk microphysical Efforts to improve the bulk microphysical parameterization in MM5, RUC, and WRF parameterization in MM5, RUC, and WRF models models (plus excursions into PBL (plus excursions into PBL parameterizations) parameterizations)
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),. - PowerPoint PPT Presentation
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IMPROVE data meeting, Seattle, WA, 13 July 2005
Recent NWP results from IMPROVERecent NWP results from IMPROVE
Efforts to improve the bulk microphysical parameterization in Efforts to improve the bulk microphysical parameterization in MM5, RUC, and WRF modelsMM5, RUC, and WRF models
(plus excursions into PBL parameterizations)(plus excursions into PBL parameterizations)
IMPROVE data meeting, Seattle, WA, 13 July 2005
List of MM5 case studies used as a baselineList 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 usingan improved bulk microphysics scheme. Part II: Case studies. Mon. Wea. Rev., in preparation.
IMPROVE data meeting, Seattle, WA, 13 July 2005
IMPROVE-1 case: 1-2 Feb 2001IMPROVE-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
1-2 Feb 20011-2 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
Thermodynamics: 1-2 Feb 2001Thermodynamics: 1-2 Feb 2001
IMPROVE data meeting, Seattle, WA, 13 July 2005
Microphysics: 1-2 Feb 2001Microphysics: 1-2 Feb 2001
KHQM
Cloud ice (purple)
Snow (blue)
Rain (green)
Graupel (red)
Clo
ud w
ate
r (g
reen)
0.160.32
0.08
0.04
0.02
0.01 g/kg
melting
Cloud water (shaded)
sample microphysical variables plot
IMPROVE data meeting, Seattle, WA, 13 July 2005
IMPROVE-2 case: 13-14 Dec 2001IMPROVE-2 case: 13-14 Dec 2001
IMPROVE data meeting, Seattle, WA, 13 July 2005
Thermodynamics: 13-14 Dec 2001Thermodynamics: 13-14 Dec 2001
• 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/
Effect of changing autoconversion only (6-hr precip)
IMPROVE data meeting, Seattle, WA, 13 July 2005
Summary and future workSummary 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