WMO International Cloud Modeling Workshop, 12-16 July 2004 A two-moment microphysical scheme for mesoscale and microscale cloud resolving models Axel Seifert.

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Presentation transcript:

WMO International Cloud Modeling Workshop, July 2004 A two-moment microphysical scheme for mesoscale and microscale cloud resolving models Axel Seifert National Center for Atmospheric Research

WMO International Cloud Modeling Workshop, July 2004 Motivation Aerosol-Cloud interactions can be a strong feedback in the climate system Quantitative precipitation forecasts suffer from oversimplified microphysical models Many ongoing projects on weather modification, but little scientific knowledge  improved microphysical models are necessary

WMO International Cloud Modeling Workshop, July 2004 Microphysical models: x = particle mass

WMO International Cloud Modeling Workshop, July 2004 Generalized Gamma Distribution x = particle mass, = shape parameter,  = tail parameter D in  m

WMO International Cloud Modeling Workshop, July 2004 Use mass and number concentrations to get an explicit size information  4 Variables A two-moment warm phase scheme (Seifert and Beheng 2001, Atmos. Res.)

WMO International Cloud Modeling Workshop, July 2004 A two-moment mixed-phase cloud scheme

WMO International Cloud Modeling Workshop, July 2004 A two-moment mixed-phase cloud scheme

WMO International Cloud Modeling Workshop, July 2004 What happend so far.... Comparison with bin microphysics Sensitivity study showed that especially high CAPE, low wind shear convective systems are sensitive to aerosols/CCN Simulation of isolated observed thunderstorms Severe storms during BAMEX WRF, MM5 and LM implementation

WMO International Cloud Modeling Workshop, July 2004 Comparison within HUCM

WMO International Cloud Modeling Workshop, July 2004 Comparison within HUCM

WMO International Cloud Modeling Workshop, July 2004 BIN BULK CONT MARI Timeseries of maximum mass concentrations

WMO International Cloud Modeling Workshop, July 2004 Total grid averaged precipitation

WMO International Cloud Modeling Workshop, July 2004 CCN effects on different storm types Weisman and Klemp (1982) sensitivity study, but now including CCN as a third external parameter: Variation of 1. CAPE 2. vertical wind shear 3. CCN concentration Effects on total precipitation? (Seifert and Beheng 2003, submitted)

WMO International Cloud Modeling Workshop, July 2004 Total 3h-precipitation supercell convection multicell conv.

WMO International Cloud Modeling Workshop, July 2004 Total 3h-precipitation and rel. change for cont. CCN

WMO International Cloud Modeling Workshop, July 2004 WRF simulation of a CRYSTAL-FACE storm (100x80 km, 250 m resolution, warm bubble, single sounding)

WMO International Cloud Modeling Workshop, July 2004 Observations vs. WRF simulation X-band reflectivity

WMO International Cloud Modeling Workshop, July 2004 Observations vs. WRF simulation W-band reflectivity

WMO International Cloud Modeling Workshop, July 2004 Attenuation by liquid water

WMO International Cloud Modeling Workshop, July 2004 Composite NEXRAD Radar 4 km BAMEX forecast 36 h Reflectivity 4 km BAMEX forecast 12 h Reflectivity Valid 6/10/03 12Z Real-time WRF 4 km BAMEX Forecast

WMO International Cloud Modeling Workshop, July 2004 BAMEX 10 June 00 UTC + 09h WRF’s Lin-type scheme Reisner-Thompson scheme Seifert-Beheng scheme Column max. reflectivity (WRF)

WMO International Cloud Modeling Workshop, July 2004 BAMEX 10 June 00 UTC + 23h WRF’s Lin-type scheme Reisner-Thompson scheme Seifert-Beheng scheme Column max. reflectivity (WRF)

WMO International Cloud Modeling Workshop, July 2004 BAMEX 10 June 00 UTC + 23h WRF’s Lin-type scheme Reisner-Thompson scheme Seifert-Beheng scheme Accumulated precip during 23 h

WMO International Cloud Modeling Workshop, July 2004 Acknowledgements: Klaus D. Beheng, Karlsruhe Uli Blahak, Karlsruhe Michael Baldauf, Karlsruhe Jochen Förstner, Karlsruhe Alexander Khain, Jerusalem Andrei Pokrovsky, Jerusalem Bill Hall, NCAR Andy Heymsfield, NCAR Morris Weisman, NCAR Gerry Heymsfield, NASA Scientific Computing Centers at Karlsruhe and NCAR

WMO International Cloud Modeling Workshop, July 2004

Various one- and two-moment schemes

WMO International Cloud Modeling Workshop, July 2004 BAMEX 10 June 00 UTC + 19h WRF’s Lin-type scheme Reisner-Thompson scheme Seifert-Beheng scheme Column max. reflectivity (WRF)

WMO International Cloud Modeling Workshop, July 2004 Maximum vertical velocities (HUCM)

WMO International Cloud Modeling Workshop, July 2004 Coupling of microphysics and dynamics!