physics scheme vs Thompson μ physics scheme Isaac Hankes Joseph Ching Difference between Kessler and Thompson schemes Kessler scheme warm rain no ice idealized microphysics timesplit rainfall ID: 1025624
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1. WRF exercise 1Kessler μ-physics schemevsThompson μ-physics scheme Isaac HankesJoseph Ching
2. Difference between Kessler and Thompson schemesKessler scheme: warm rain- no ice, idealized microphysics, time-split rainfallThompson scheme: 6-class microphysics with graupel, ice and rain number conc. Predicted (double-moment ice), time-split fall termsKessler takes about 2.5 hours, Thompson takes about 5+ hours computer time for a 180-mins simulation.
3. Comparison (2): vorticity tendency There are four terms in the vorticity tendency equation: tilting, divergence, solenoid and advection terms. Comparison is made among schemes, time, and height level.
4. Max. Vorticity Time Series (s-1)ThompsonKessler
5. 3-D Max Vorticity Time SeriesThompsonKessler
6. Vorticity Tendency TermsKesslerThompson
7. Max Vorticity by LevelThompsonKessler
8. Vorticity Tendency: 1km (90min) **Kessler on left, Thompson on right for all contour plots**
9. Vorticity Tendency: 2km (90min)
10. Vorticity Tendency: 5km (90min)
11. Vorticity Tendency: 10km (150min)
12. Vorticity TendencyAll Terms: 2km (30min)
13. ConclusionsMax vorticity peaks earlier in KesslerMax vorticity generally higher vertically in ThompsonAdvective term dominates for both, strongest at 10kmRight cell much more dominant in Thompson (more realistic)Kessler storms move faster