Investigation of the impact of Microphysics Options on Idealized WRF Supercell
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INVESTIGATION OF THE IMPACT OF MICROPHYSICS OPTIONS ON IDEALIZED WRF SUPERCELL Catrin M. Mills Sara T. Strey-Mellema
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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) - PowerPoint PPT Presentation
Transcript of Investigation of the impact of Microphysics Options on Idealized WRF Supercell
INVESTIGATION OF THE IMPACT OF MICROPHYSICS OPTIONS ON IDEALIZED WRF SUPERCELLCatrin M. MillsSara T. Strey-Mellema
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 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
ADVECTION TERM: THOMPSON VS. KESSLER
DIVERGENCE TERM: THOMPSON VS. KESSLER
TILTING TERM: THOMPSON VS. KESSLER
ADVECTION TERM: THOMPSON VS. KESSLER
W- WIND
kessler thompson millbrandt
