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Testing bulk parameterization of microphysics in ALARO 10

Testing bulk parameterization of microphysics in ALARO 10. Tomislav Kovacic DHMZ, Croatia. ALARO 10. ALADIN dynamics + MNH physics Hydrostatic version of AROME + parameterization of convection Prototype Leader: Gwenaelle Hello. Gard case. Date: 2002-09-08 start time 2002-09-09 12

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Testing bulk parameterization of microphysics in ALARO 10

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  1. Testing bulk parameterization of microphysics in ALARO 10 Tomislav Kovacic DHMZ, Croatia

  2. ALARO 10 • ALADIN dynamics + MNH physics • Hydrostatic version of AROME + parameterization of convection • Prototype • Leader: Gwenaelle Hello

  3. Gard case • Date: 2002-09-08 • start time 2002-09-09 12 • validity time=2002-09-09 00 • Domain: A specific domain for this case 192x192 (smaller than aladin oper)

  4. GARD 2002-09-08TSTEP=30 s

  5. GARD 2002-09-08TSTEP=120 s

  6. GARD 2002-09-08TSTEP=360 s

  7. Time splitting for microphysical scheme • Time step used in operational version of the model is to long for microphysics and the consequence is to few precipitation. • Time splitting for microphysical scheme has to be introduced in the model. • Iterations of microphysics: • microphysical scheme is performed several times in one time step of the model

  8. Method • Maximal amount of precipitation on the ground • Time steps: 30, 60, 120, 180, 240, 300, 360 and 400 s • Iterations: 1,2,3,6 and 9

  9. GARD 2002-09-08TIME=12 h

  10. GARD 2002-09-08TIME=12 h

  11. GARD 2002-09-08TIME=12 h

  12. GARD 2002-09-08TIME=12 h

  13. GARD 2002-09-08TIME=12 h

  14. GARD 2002-09-08TIME=12 h

  15. GARD 2002-09-08TIME=12 h

  16. GARD 2002-09-08TIME=12 h

  17. GARD 2002-09-08TIME=12 h

  18. An other consequence • Geographical position of the precipitation area is changing • It moves upstream

  19. GARD 9-8-2002TSTEP=120 s ITERATIONS=1

  20. GARD 9-8-2002TSTEP=120 s ITERATIONS=3

  21. GARD 9-8-2002TSTEP=120 s ITERATIONS=3

  22. Conclusions • The amount of precipitation increases with decreasing time step • It is converging for all studied cases • Time splitting doesn’t converge always and when it does it is not the same value as for the same time step of the model • Shorter time step must be used

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