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The set up of the RICO intercomparison case

The set up of the RICO intercomparison case. Louise Nuijens, A. Pier Siebesma and Margreet van Zanten. KNMI and Wageningen University, The Netherlands. Photo courtesy Bjorn Stevens. Initial objective to focus one single day:. January 11 th 2004

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The set up of the RICO intercomparison case

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  1. The set up of the RICO intercomparison case Louise Nuijens, A. Pier Siebesma and Margreet van Zanten KNMI and Wageningen University, The Netherlands Photo courtesy Bjorn Stevens

  2. Initial objective to focus one single day: January 11th 2004 • Almost complete suite of measurement facilities present • Average amount of precip : 0.6 mm/day

  3. However, not the best choice: • Atmospheric state variable during the day • No way to derive LS-budget for one specific day • LES results create too vigorous clouds

  4. Alternative: Construct a composite based on a suppressed period from 16/12/04 till 08/01/05 Average precip in this period: 0.34 mm/day

  5. Average Soundings for this period

  6. To obtain LS forcings: Use a high-res hindcast for the whole RICO period.

  7. Total rainfall rate RACMO

  8. Large Scale Forcings: Hor. T-advection Hor. q-advection subsidence

  9. Radiative Tendency

  10. Surface Conditions

  11. Budget Analysis -15 -36 + 75 -69 +5 + 10 0.3K/day -6 -11 -125 + 140 - 10 0.05 g/kg /day

  12. SCM vs LES profiles

  13. RICO vs BOMEX

  14. Microphysics Nc of case study set to 45

  15. What is a cloud?(or how to define a cloudy/rainy gridcell?) Set up: qc or Nr > 0 (or ) -> not so useful for bin models We need a physically based threshold! Choices:* threshold based on qc/qr or Nc/Nr * waterweighted (to calculate mean N) Preferentially one which is suitable for RICO data analysis as well.

  16. DALES sensitivity

  17. RAMS@NOAA sensitivity

  18. DHARMA sensitivity

  19. Threshold • Based on qc and qr: 0.01and 0.001 g/kg • Based on Nr 5 per liter Photo courtesy Bjorn Stevens

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