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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. 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

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  1. Investigation of the impact of Microphysics Options on Idealized WRF Supercell Catrin M. Mills Sara T. Strey-Mellema

  2. 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

  3. 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

  4. Advection Term: Thompson vs. Kessler

  5. Divergence Term: Thompson vs. Kessler

  6. Tilting Term: Thompson vs. Kessler

  7. Advection Term: Thompson vs. Kessler

  8. W- Wind thompson kessler millbrandt

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