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Investigation of the impact of Microphysics Options on Idealized WRF Supercell. Catrin M. Mills Sara T. Strey- Mellema. Microphysics. Kessler: Warm rain – no ice Idealized microphysics (read- simple) Time-split rainfall Thompson: Replacement of Thompson et al. (2007)

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investigation of the impact of microphysics options on idealized wrf supercell

Investigation of the impact of Microphysics Options on Idealized WRF Supercell

Catrin M. Mills

Sara T. Strey-Mellema

microphysics
Microphysics
  • Kessler:
    • Warm rain – no ice
    • Idealized microphysics (read- simple)
    • Time-split rainfall
  • Thompson:
    • Replacement of Thompson et al. (2007)
    • 6-class microphysics with graupel with ice and rain number concentrations (rather than idealized)
    • predicted (double-moment ice)
    • Time-split fall terms
  • Millbrandt:
    • New in Version 3.2
    • 7-class microphysics with separate graupel and hail
    • Number concentrations predicted for all six species
    • water/ice species (double-moment) – 12
    • Time-split fall terms
hypothesis
Hypothesis
  • The microphysics scheme that best represents ice particles will have the strongest updrafts and strongest mesocyclone
  • Model studies have shown that simulating ice effects storm dynamics, such that vertical vorticity is enhanced throughout the storm
  • We expect that the more sophisticated schemes are necessary in generating cold pools that can generate horizontal vorticity and downdrafts that can tilt it into the vertical
w wind
W- Wind

thompson

kessler

millbrandt