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Splitting Supercell

Splitting Supercell. Idealized Simulation Diff_6 th _opt Presented By: Jeff Curtis, Jason Keeler, and Cody Fritz. S. Nesbitt – ATMS 597. Objective. To track a simulated mesocyclone and assess the contribution of the terms in the vorticity tendency equation.

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Splitting Supercell

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  1. Splitting Supercell Idealized Simulation Diff_6th_opt Presented By: Jeff Curtis, Jason Keeler, and Cody Fritz S. Nesbitt – ATMS 597

  2. Objective • To track a simulated mesocyclone and assess the contribution of the terms in the vorticity tendency equation. • To change the 6th-order numerical diffusion option to 1 and compare to control simulation.

  3. Outline • Brief background on numerical diffusion option. • Track of vorticity maximum. • Comparison of vorticity maximum at 1.5km (video available) • Comparison of average vorticity between 0-3km.. • Comparison of reflectivity (dBZ) (video available). • Difference plots for Stretching, tilting, and solenoid terms.

  4. Background • The 6th-order horizontal diffusion acts as a short-wave numerical noise filter (Chapter 5 – WRF Users Guide). • 3 options are available: • 0 = no 6th-order numerical diffusion • 1 = 6th-order numerical diffusion • 2 = 6th-order numerical diffusion but with the prohibiting of up-gradient diffusion

  5. Maximum Vorticity Location

  6. Vorticity – 1.5 km Control – 00:05 Diff_6th – 00:05

  7. Vorticity – 1.5 km Control – 01:00 Diff_6th – 01:00

  8. Vorticity – 1.5 km Control – 02:00 Diff_6th – 02:00

  9. Vorticity – 1.5 km Control – 03:00 Diff_6th – 03:00

  10. Vorticity – Averaged 0-3km Control – 00:05 Diff_6th – 00:05

  11. Vorticity – Averaged 0-3km Control – 01:00 Diff_6th – 01:00

  12. Vorticity – Averaged 0-3km Control – 02:00 Diff_6th – 02:00

  13. Vorticity – Averaged 0-3km Control – 03:00 Diff_6th – 03:00

  14. dBZ Control – 00:15 Diff_6th – 00:15

  15. dBZ Control – 01:00 Diff_6th – 01:00

  16. dBZ Control – 02:00 Diff_6th – 02:00

  17. dBZ Control – 03:00 Diff_6th – 03:00

  18. Stretching Term Difference between control and diff_6th option 00:05

  19. Stretching Term Difference between control and diff_6th option 01:00

  20. Stretching Term Difference between control and diff_6th option 02:00

  21. Stretching Term Difference between control and diff_6th option 03:00

  22. Tilting Term Difference between control and diff_6th option 00:05

  23. Tilting Term Difference between control and diff_6th option 01:00

  24. Tilting Term Difference between control and diff_6th option 02:00

  25. Tilting Term Difference between control and diff_6th option 03:00

  26. Solenoid Term Difference between control and diff_6th option 00:05

  27. Solenoid Term Difference between control and diff_6th option 01:00

  28. Solenoid Term Difference between control and diff_6th option 02:00

  29. Solenoid Term Difference between control and diff_6th option 03:00

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