1 / 13

WRF exercise 1

WRF exercise 1. Kessler μ -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, time-split rainfall

pascha
Download Presentation

WRF exercise 1

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related