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Comparison of Kessler and Thompson Microphysics Schemes in Weather Modeling

This study contrasts the Kessler and Thompson microphysics schemes used in atmospheric modeling. The Kessler scheme, focused on warm rain processes, utilizes idealized microphysics with a simpler time-split system, while the more complex Thompson scheme incorporates multiple hydrometeors, including graupel and ice, leading to longer computational times. Key findings include differences in vorticity tendencies, with Kessler showing earlier peaks and faster storm movement, while Thompson exhibits greater vorticity vertically and a more dominant advective term.

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Comparison of Kessler and Thompson Microphysics Schemes in Weather Modeling

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  1. WRF exercise 1 Kessler μ-physics scheme vs Thompson μ-physics scheme Isaac Hankes Joseph Ching

  2. Difference between Kessler and Thompson schemes • Kessler scheme: warm rain- no ice, idealized microphysics, time-split rainfall • Thompson scheme: 6-class microphysics with graupel, ice and rain number conc. Predicted (double-moment ice), time-split fall terms • Kessler 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) Thompson Kessler

  5. 3-D Max Vorticity Time Series Thompson Kessler

  6. Vorticity Tendency Terms Kessler Thompson

  7. Max Vorticity by Level Thompson Kessler

  8. VorticityTendency: 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. VorticityTendencyAll Terms: 2km (30min)

  13. Conclusions • Max vorticity peaks earlier in Kessler • Max vorticity generally higher vertically in Thompson • Advective term dominates for both, strongest at 10km • Right cell much more dominant in Thompson (more realistic) • Kessler storms move faster

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