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GABLS workshop, Stockholm, 19-21 June 2007 Simple but realistic cases from Cabauw for GABLS Fred Bosveld (KNMI) with contributions from: Peter Baas Gert.

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Presentation on theme: "GABLS workshop, Stockholm, 19-21 June 2007 Simple but realistic cases from Cabauw for GABLS Fred Bosveld (KNMI) with contributions from: Peter Baas Gert."— Presentation transcript:

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

3 GABLS workshop, Stockholm, 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, June 2007 Cabauw ~1 km

5 GABLS workshop, Stockholm, June 2007 Cabauw ~10 km

6 GABLS workshop, Stockholm, 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

7 GABLS workshop, Stockholm, June 2007 Wind speed for 9 cases

8 GABLS workshop, Stockholm, June 2007 Wind speed for 9 cases

9 GABLS workshop, Stockholm, June 2007 Wind direction for 9 cases

10 GABLS workshop, Stockholm, June 2007 Wind direction for 9 cases

11 GABLS workshop, Stockholm, June 2007 Potential temperature for 9 cases

12 GABLS workshop, Stockholm, June 2007 Synoptics 01/02 July 2006

13 GABLS workshop, Stockholm, June 2007 Hodogram 18: :00 01/02 July 2006

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

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

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

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

18 GABLS workshop, Stockholm, June 2007 Convective Boundary Layer 02 July 2006

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

20 GABLS workshop, Stockholm, 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, June 2007 Proposed model intercomparison experiment with simple but realistic case from Cabauw 3 model experiments starting from 12:00 1st July 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, June 2007 Thank you ! For more on the proposed case see: -> research -> gabls here also links to first results HIRLAM and MM5 can be found.


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