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CCN effects on numerically simulated mixed-phase convective storms with Klaus D. Beheng, University Karlsruhe, Germany Alexander Khain, Hebrew University.

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Presentation on theme: "CCN effects on numerically simulated mixed-phase convective storms with Klaus D. Beheng, University Karlsruhe, Germany Alexander Khain, Hebrew University."— Presentation transcript:

1 CCN effects on numerically simulated mixed-phase convective storms with Klaus D. Beheng, University Karlsruhe, Germany Alexander Khain, Hebrew University Jerusalem, Israel Axel Seifert National Center for Atmospheric Research (ASP/MMM)

2 Motivation Explicit simulation of aerosol-cloud interaction is necessary to estimate indirect aerosol effects on climate Considering aerosol conditions might increase the forecast skill of NWP models How can we improve the representation of clouds in weather and climate models?

3 (Seifert and Beheng 2001) A two-moment 5-class cloud scheme

4 Nucleation? RICO!

5 (Seifert and Beheng 2003, submitted)

6 Comparison within the Hebrew Univ. Cloud Model (HUCM)

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8 BIN BULK CONT MARI Timeseries of maximum mass concentrations

9 Maximum vertical velocities

10 Total grid averaged precipitation (Seifert et al. 2004, submitted)

11 A numerical study of 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)

12 Total 3h-precipitation supercell convection multicell conv.

13 Total 3h-precipitation and rel. change for cont. CCN

14 Coupling of microphysics and dynamics!

15 Continuous transition from maritime to cont. CCN

16 Confronting the model with real data! Dual-wavelength radar data from CRYSTAL-FACE: (data provided by G. Heymsfield, NASA)

17 Observations vs. WRF Simulation

18 Summary A new two-moment microphysical scheme has been developed and is implemented in WRF (KAMM2, LM, MM5) The scheme is able to resolve CCN effects explicitly The scheme shows a good agreement with the spectral bin microphysics in the Hebrew Univ. Cloud Model A sensitivity study shows an inverse aerosol effect for multicellular convection (latent heat effect) Validation with dual-wavelength radar?

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23 Autoconversion

24 GATE squall line – total precip.

25 Bulk nucleation scheme

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