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CCN effects on numerically simulated mixed-phase convective storms

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

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CCN effects on numerically simulated mixed-phase convective storms

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

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

  4. Nucleation? RICO!

  5. (Seifert and Beheng 2003, submitted)

  6. Comparison within theHebrew Univ. Cloud Model (HUCM)

  7. Comparison within theHebrew Univ. Cloud Model (HUCM)

  8. Timeseries of maximum mass concentrations BIN BULK CONT MARI

  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 nowincluding CCN as a third external parameter: • Variation of • 1. CAPE 2. vertical wind shear3. CCN concentration • Effects on total precipitation? (Seifert and Beheng 2003, submitted)

  12. Total 3h-precipitation multicell conv. supercell convection

  13. Total 3h-precipitationand 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?

  19. Autoconversion

  20. GATE squall line – total precip.

  21. Bulk nucleation scheme

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