CCN effects on numerically simulated mixed-phase convective storms with Klaus D. Beheng, University...
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![Page 1: CCN effects on numerically simulated mixed-phase convective storms with Klaus D. Beheng, University Karlsruhe, Germany Alexander Khain, Hebrew University.](https://reader036.fdocuments.in/reader036/viewer/2022081603/56649f2f5503460f94c4983f/html5/thumbnails/1.jpg)
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)
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Motivation
• Explicit simulation of aerosol-cloud interactionis necessary to estimate indirect aerosol effects on climate
• Considering aerosol conditions might increasethe forecast skill of NWP models
• How can we improve the representation of clouds in weather and climate models?
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(Seifert and Beheng 2001)
A two-moment 5-class cloud scheme
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Nucleation? RICO!
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(Seifert and Beheng 2003, submitted)
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Comparison within theHebrew Univ. Cloud Model (HUCM)
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Comparison within theHebrew Univ. Cloud Model (HUCM)
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BIN BULK
CONT
MARI
Timeseries of maximum mass concentrations
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Maximum vertical velocities
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Total grid averaged precipitation
(Seifert et al. 2004, submitted)
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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)
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Total 3h-precipitation
supercell convection
multicell conv.
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Total 3h-precipitationand rel. change for cont. CCN
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Coupling of microphysics and dynamics!
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Continuous transition from maritime to cont. CCN
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Confronting the model with real data!
Dual-wavelength radar data from CRYSTAL-FACE:
(data provided by G. Heymsfield, NASA)
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Observations vs. WRF Simulation
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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 spectralbin microphysics in the Hebrew Univ. Cloud Model
• A sensitivity study shows an inverse aerosol effectfor multicellular convection (latent heat effect)
• Validation with dual-wavelength radar?
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Autoconversion
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GATE squall line – total precip.
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Bulk nucleation scheme