1. GABLS workshop, Stockholm, 19-21 June 2007 Simple but realistic cases from Cabauw for GABLS Fred Bosveld (KNMI) with contributions from: Peter Baas Gert Jan Steeneveld Cisko de Bruijn Sander Tijm Henk Klein Baltink

2. GABLS workshop, Stockholm, 19-21 June 2007 Content - Next steps in GABLS - Case selection from Cabauw - Available Observations - First (HIRLAM) model results - Boundary conditions - Proposal

3. GABLS workshop, Stockholm, 19-21 June 2007 Next steps in GABLS - Land Atmosphere coupling - Inertial oscillation and Low Level Jets - Onset of decoupling - Morning time transition GEWEX theme: “The diurnal cycle” }

4. GABLS workshop, Stockholm, 19-21 June 2007 Cabauw ~1 km

5. GABLS workshop, Stockholm, 19-21 June 2007 Cabauw ~10 km

6. GABLS workshop, Stockholm, 19-21 June 2007 Case selection from Cabauw - Cloudless - Constant geowind - Geowind ~ 7 m/s > 6 m/s to allow for turbulence < 8 m/s LLJ below top of the 200 m tower - No dew formation - 9 cases from 2001 - 2007

7. GABLS workshop, Stockholm, 19-21 June 2007 Wind speed for 9 cases

8. GABLS workshop, Stockholm, 19-21 June 2007 Wind speed for 9 cases

9. GABLS workshop, Stockholm, 19-21 June 2007 Wind direction for 9 cases

10. GABLS workshop, Stockholm, 19-21 June 2007 Wind direction for 9 cases

11. GABLS workshop, Stockholm, 19-21 June 2007 Potential temperature for 9 cases

12. GABLS workshop, Stockholm, 19-21 June 2007 Synoptics 01/02 July 2006

13. GABLS workshop, Stockholm, 19-21 June 2007 Hodogram 18:00 - 06:00 01/02 July 2006

14. GABLS workshop, Stockholm, 19-21 June 2007 Richardson number and friction velocity 01/02 July 2006

15. GABLS workshop, Stockholm, 19-21 June 2007 Sensible and latent heat flux for 01/02 July 2006

16. GABLS workshop, Stockholm, 19-21 June 2007 Energy budget for 01/02 July 2006 (60 and 180 absent)

17. GABLS workshop, Stockholm, 19-21 June 2007 Profiles of wind direction and -speed, potential- and dew-point temperature for 01/02 July 2006.

18. GABLS workshop, Stockholm, 19-21 June 2007 Convective Boundary Layer 02 July 2006

19. GABLS workshop, Stockholm, 19-21 June 2007 Preliminary model results (HIRLAM) 01/02 July 2006

20. GABLS workshop, Stockholm, 19-21 June 2007 Boundary conditions -Initial profiles from Windprofiler/RASS and Radio soundings De Bilt, perhaps IPT. -Radiation from local observations. -Constant or linear changing geowind from pressure fields. -Surface parameters: regional local. -Soil water conditions from local observations.

21. GABLS workshop, Stockholm, 19-21 June 2007 Proposed model intercomparison experiment with simple but realistic case from Cabauw 3 model experiments starting from 12:00 1st July 2006 1.Prescribed surface forcing (Temperature or Flux) 2.Simple soil-vegetation model 3.Each model with its own SVAT, but parameters set for Cabauw.

22. GABLS workshop, Stockholm, 19-21 June 2007 Thank you ! For more on the proposed case see: http://www.knmi.nl/~bosveldhttp://www.knmi.nl/~bosveld -> research -> gabls here also links to first results HIRLAM and MM5 can be found.