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Second GABLS experiment CASES-99 data 0ctober 22 – October 24 Gunilla Svensson

Second GABLS experiment CASES-99 data 0ctober 22 – October 24 Gunilla Svensson Department of meteorology, Stockholm university. The case Kansas US (37.6N, -96.7E) Flat terrain with z0=0.03m Constant geostrophic wind u g =3 ms -1 , v g =-9 ms -1

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Second GABLS experiment CASES-99 data 0ctober 22 – October 24 Gunilla Svensson

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  1. Second GABLS experiment CASES-99 data 0ctober 22 – October 24 Gunilla Svensson Department of meteorology, Stockholm university

  2. The case • Kansas US (37.6N, -96.7E) • Flat terrain with z0=0.03m • Constant geostrophic wind ug=3 ms-1, vg=-9 ms -1 • Weak large-scale synoptic divergence after 16LT October 23 • Prescribed surface temperature • Latent heat flux 2.5% of the potential value • Simulation time 60 hours with start at 14LT October 22

  3. Prescribed surface temperature

  4. Observed temperature

  5. Observed humidity

  6. Observed wind speed

  7. Observed wind direction

  8. Observed above boundary layer wind

  9. Modeled wind speed (MIUU)

  10. NAME MODEL TYPE Anne Mccabe MO-OP MO-OP-70 MO-SHARP MO-SHARP-70 Anning Cheng LaRC Anton Beljaars ECMWF Eric Bazile MFOPE MFTKE Frank Freedman NCEPGFS YSU Gert-Jan Steeneveld WUR-D91 Hiroto Kitagawa JMA-OP JMA Jocelyn Mailhot MSC Jon Pleim ACM2 Matteo Zampieri ISAC-Oper ISAC-Res Cisco de Bruijn KNMI-635 KNMI-635a Valery Masson MESONH-CNRM Gunilla Svensson MIUU Participating model (so far...)

  11. RESULTS

  12. Boundary-layer height

  13. October 23, 10-16LT

  14. October 23 20LT – October 24 04LT

  15. October 24, 10-16LT

  16. Potential temperature

  17. Specific humidity

  18. Potential temperature

  19. Potential temperature

  20. Potential temperature

  21. Potential temperature

  22. Specific humidity

  23. Wind speed

  24. Wind speed

  25. Wind speed

  26. Wind speed

  27. Wind speed

  28. Friction velocity

  29. Sensible heat flux

  30. 2-m temperature

  31. 10-m wind speed

  32. 10-m wind direction

  33. 10-m wind direction

  34. Turbulent kinetic energy

  35. Monin-Obukhov length

  36. What can we learn from this? • Better agreement during day than during night • Surface fluxes and boundary-layer height are overestimated during night • Inter-model spread is increasing with time • Results dependent on resolution ? • ... • Much more analyses is needed

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